> For clean Markdown of any page, append .md to the page URL. > For a complete documentation index, see https://docs.0x.org/llms.txt. > For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.0x.org/_mcp/server. # submit POST https://api.0x.org/gasless/submit Content-Type: application/json Submit a gasless swap Reference: https://docs.0x.org/api-reference/evm-ap-is/gasless/submit ## Request ### Headers - `0x-api-key` (string, required) — Visit dashboard.0x.org to get your API Key - `0x-version` (string, required) — API version ### Body (application/json) This endpoint expects an object. - `chainId` (integer, required) — Chain ID. See [here](https://docs.0x.org/docs/introduction/supported-chains) for the list of supported chains - `trade` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTrade, required) — The trade object from the quote endpoint including its signature - `approval` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApproval, optional, nullable) — The gasless approval object from the quote endpoint including its signature ## Response ### 200 Successful response - `tradeHash` (string, required) — The hash for the trade according to [EIP-712](https://eips.ethereum.org/EIPS/eip-712) - `type` (enum, required) — The transaction type for a Gasless trade - Allowed values: `settler_metatransaction` - `zid` (string, required) — The unique ZeroEx identifier of the request ## Errors ### 400 Bad Request Error 400 error response - `Gasless::submitRequestBadRequestError` - INPUT_INVALID - INSUFFICIENT_BALANCE_OR_ALLOWANCE - INVALID_APPROVAL - INVALID_SIGNATURE - INVALID_SIGNER - META_TRANSACTION_EXPIRY_TOO_SOON - META_TRANSACTION_INVALID - PENDING_TRADES_ALREADY_EXIST - SMART_WALLET_NOT_SUPPORTED - TRADE_ALREADY_SUBMITTED ### 500 Internal Server Error 500 error response - `Gasless::submitRequestInternalServerError` - INTERNAL_SERVER_ERROR - UNCATEGORIZED ## Types ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTrade The trade object from the quote endpoint including its signature - `type` (enum, required) — The `trade.type` from the quote endpoint - Allowed values: `settler_metatransaction` - `eip712` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeEip712, required) — The `trade.eip712` from the quote endpoint - `signature` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeSignature, required) — A discriminated union based on `signatureType`. For EIP712 (`signatureType: 2`) or EthSign (`signatureType: 3`): provide `v`, `r`, and `s`. For Raw (`signatureType: 5`): provide `signatureBytes` only. Use Raw (`signatureType: 5`) to support smart contract wallets (e.g. ERC-1271) that return opaque signature bytes. ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApproval The gasless approval object from the quote endpoint including its signature - `type` (enum, required) — The `approval.type` from the quote endpoint - Allowed values: `executeMetaTransaction::approve`, `permit`, `erc7597Permit`, `daiPermit` - `eip712` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712, required) - `signature` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalSignature, required) — A discriminated union based on `signatureType`. For EIP712 (`signatureType: 2`) or EthSign (`signatureType: 3`): provide `v`, `r`, and `s`. For Raw (`signatureType: 5`): provide `signatureBytes` only. Use Raw (`signatureType: 5`) to support smart contract wallets (e.g. ERC-1271) that return opaque signature bytes. ### INPUT_INVALID - `name` (enum, required) - Allowed values: `INPUT_INVALID` - `message` (string, required) - `data` (InputInvalidData, required) ### INSUFFICIENT_BALANCE_OR_ALLOWANCE - `name` (enum, required) - Allowed values: `INSUFFICIENT_BALANCE_OR_ALLOWANCE` - `message` (string, required) - `data` (InsufficientBalanceOrAllowanceData, required) ### INVALID_APPROVAL - `name` (enum, required) - Allowed values: `INVALID_APPROVAL` - `message` (string, required) - `data` (InvalidApprovalData, required) ### INVALID_SIGNATURE - `name` (enum, required) - Allowed values: `INVALID_SIGNATURE` - `message` (string, required) - `data` (InvalidSignatureData, required) ### INVALID_SIGNER - `name` (enum, required) - Allowed values: `INVALID_SIGNER` - `message` (string, required) - `data` (InvalidSignerData, required) ### META_TRANSACTION_EXPIRY_TOO_SOON - `name` (enum, required) - Allowed values: `META_TRANSACTION_EXPIRY_TOO_SOON` - `message` (string, required) - `data` (MetaTransactionExpiryTooSoonData, required) ### META_TRANSACTION_INVALID - `name` (enum, required) - Allowed values: `META_TRANSACTION_INVALID` - `message` (string, required) - `data` (MetaTransactionInvalidData, required) ### PENDING_TRADES_ALREADY_EXIST - `name` (enum, required) - Allowed values: `PENDING_TRADES_ALREADY_EXIST` - `message` (string, required) - `data` (PendingTradesAlreadyExistData, required) ### SMART_WALLET_NOT_SUPPORTED - `name` (enum, required) - Allowed values: `SMART_WALLET_NOT_SUPPORTED` - `message` (string, required) - `data` (SmartWalletNotSupportedData, required) ### TRADE_ALREADY_SUBMITTED - `name` (enum, required) - Allowed values: `TRADE_ALREADY_SUBMITTED` - `message` (string, required) - `data` (TradeAlreadySubmittedData, required) ### INTERNAL_SERVER_ERROR - `name` (enum, required) - Allowed values: `INTERNAL_SERVER_ERROR` - `message` (string, required) - `data` (InternalServerErrorData, required) ### UNCATEGORIZED - `name` (enum, required) - Allowed values: `UNCATEGORIZED` - `message` (string, required) - `data` (UncategorizedData, required) ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeEip712 The `trade.eip712` from the quote endpoint - `types` (map from string to list of GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeEip712TypesItems, required) - `primaryType` (string, required) - `domain` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeEip712Domain, required) - `message` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeEip712Message, required) ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeSignature A discriminated union based on `signatureType`. For EIP712 (`signatureType: 2`) or EthSign (`signatureType: 3`): provide `v`, `r`, and `s`. For Raw (`signatureType: 5`): provide `signatureBytes` only. Use Raw (`signatureType: 5`) to support smart contract wallets (e.g. ERC-1271) that return opaque signature bytes. - `signatureType` (double, required) — Signature type enum: `2` (EIP712), `3` (EthSign), or `5` (Raw). Determines which other fields are required. - `v` (double, optional) — ECDSA recovery id. Required when signatureType is `2` (EIP712) or `3` (EthSign). - `r` (string, optional) — ECDSA signature r value (hex string). Required when signatureType is `2` (EIP712) or `3` (EthSign). - `s` (string, optional) — ECDSA signature s value (hex string). Required when signatureType is `2` (EIP712) or `3` (EthSign). - `signatureBytes` (string, optional) — Raw signature bytes (hex string). Required when signatureType is `5` (Raw). Must not be provided for other signature types. ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712 - GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip7120 - GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip7121 - GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip7122 ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalSignature A discriminated union based on `signatureType`. For EIP712 (`signatureType: 2`) or EthSign (`signatureType: 3`): provide `v`, `r`, and `s`. For Raw (`signatureType: 5`): provide `signatureBytes` only. Use Raw (`signatureType: 5`) to support smart contract wallets (e.g. ERC-1271) that return opaque signature bytes. - `signatureType` (double, required) — Signature type enum: `2` (EIP712), `3` (EthSign), or `5` (Raw). Determines which other fields are required. - `v` (double, optional) — ECDSA recovery id. Required when signatureType is `2` (EIP712) or `3` (EthSign). - `r` (string, optional) — ECDSA signature r value (hex string). Required when signatureType is `2` (EIP712) or `3` (EthSign). - `s` (string, optional) — ECDSA signature s value (hex string). Required when signatureType is `2` (EIP712) or `3` (EthSign). - `signatureBytes` (string, optional) — Raw signature bytes (hex string). Required when signatureType is `5` (Raw). Must not be provided for other signature types. ### InputInvalidData - `zid` (string, required) — The unique ZeroEx identifier of the request - `details` (list of InputInvalidDataDetailsItems, required) — The list of invalid inputs ### InsufficientBalanceOrAllowanceData - `zid` (string, required) — The unique ZeroEx identifier of the request - `metaTransactionHash` (string, required) — The hash of the meta-transaction provided by the caller - `taker` (string, required) — The intended signer of the meta-transaction - `sellToken` (string, required) — The sell token - `sellAmount` (string, required) — The sell amount - `minBalanceOrAllowance` (string, required) — The smaller value of the balance or the allowance of the taker ### InvalidApprovalData - `zid` (string, required) — The unique ZeroEx identifier of the request - `metaTransactionHash` (string, required) — The hash of the meta-transaction provided by the caller - `taker` (string, required) — The taker of the trade ### InvalidSignatureData - `zid` (string, required) — The unique ZeroEx identifier of the request - `metaTransactionHash` (string, required) — The hash of the meta-transaction provided by the caller - `taker` (string, required) — The intended signer of the meta-transaction ### InvalidSignerData - `zid` (string, required) — The unique ZeroEx identifier of the request - `metaTransactionHash` (string, required) — The hash of the meta-transaction provided by the caller - `taker` (string, required) — The intended signer of the meta-transaction - `signer` (string, required) — The signer of the meta-transaction ### MetaTransactionExpiryTooSoonData - `zid` (string, required) — The unique ZeroEx identifier of the request - `metaTransactionHash` (string, required) — The hash of the meta-transaction provided by the caller - `expiry` (string, required) — The expiry of the meta-transaction provided by the caller in ms ### MetaTransactionInvalidData - `zid` (string, required) — The unique ZeroEx identifier of the request - `metaTransactionHash` (string, required) — The hash of the meta-transaction provided by the caller ### PendingTradesAlreadyExistData - `zid` (string, required) — The unique ZeroEx identifier of the request - `metaTransactionHash` (string, required) — The hash of the meta-transaction provided by the caller - `pendingMetaTransactionHashes` (list of string, required) — The list of pending meta-transaction hashes for the same taker and sell token ### SmartWalletNotSupportedData - `zid` (string, required) — The unique ZeroEx identifier of the request - `taker` (string, required) — The smart wallet address that was rejected - `chainId` (double, required) — The chain where smart wallets are not supported ### TradeAlreadySubmittedData - `zid` (string, required) — The unique ZeroEx identifier of the request - `tradeHash` (string, required) — The hash of the trade that was already submitted ### InternalServerErrorData - `zid` (string, required) — The unique ZeroEx identifier of the request ### UncategorizedData - `zid` (string, required) — The unique ZeroEx identifier of the request ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeEip712TypesItems - `name` (string, required) - `type` (string, required) ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeEip712Domain - `name` (string, optional) - `version` (string, optional) - `chainId` (double, optional) - `verifyingContract` (string, optional) - `salt` (string, optional) ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeEip712Message - `permitted` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeEip712MessagePermitted, required) - `spender` (string, required) - `nonce` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeEip712MessageNonce, required) - `deadline` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeEip712MessageDeadline, required) - `slippageAndActions` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeEip712MessageSlippageAndActions, required) ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip7120 - `types` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf0Types, required) - `domain` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf0Domain, required) - `message` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf0Message, required) - `primaryType` (enum, required) - Allowed values: `Permit` ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip7121 - `types` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf1Types, required) - `domain` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf1Domain, required) - `message` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf1Message, required) - `primaryType` (enum, required) - Allowed values: `Permit` ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip7122 - `types` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf2Types, required) - `domain` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf2Domain, required) - `message` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf2Message, required) - `primaryType` (enum, required) - Allowed values: `MetaTransaction` ### InputInvalidDataDetailsItems - `field` (string, required) — The input field name - `reason` (string, required) — The validation failure reason ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeEip712MessagePermitted - `token` (string, required) - `amount` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeEip712MessagePermittedAmount, required) ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeEip712MessageNonce - string - double - any ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeEip712MessageDeadline - string - double - any ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeEip712MessageSlippageAndActions - `recipient` (string, required) - `buyToken` (string, required) - `minAmountOut` (GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeEip712MessageSlippageAndActionsMinAmountOut, required) - `actions` (list of string, required) ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf0Types - `EIP712Domain` (list of GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf0TypesEip712DomainItems, required) - `Permit` (list of GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf0TypesPermitItems, required) ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf0Domain - `name` (string, optional) - `version` (string, optional) - `chainId` (double, optional) - `verifyingContract` (string, optional) - `salt` (string, optional) ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf0Message - `owner` (string, required) - `spender` (string, required) - `value` (string, required) - `nonce` (double, required) - `deadline` (string, required) ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf1Types - `EIP712Domain` (list of GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf1TypesEip712DomainItems, required) - `Permit` (list of GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf1TypesPermitItems, required) ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf1Domain - `name` (string, optional) - `version` (string, optional) - `chainId` (double, optional) - `verifyingContract` (string, optional) - `salt` (string, optional) ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf1Message - `holder` (string, required) - `spender` (string, required) - `nonce` (double, required) - `expiry` (string, required) - `allowed` (boolean, required) ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf2Types - `EIP712Domain` (list of GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf2TypesEip712DomainItems, required) - `MetaTransaction` (list of GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf2TypesMetaTransactionItems, required) ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf2Domain - `name` (string, optional) - `version` (string, optional) - `chainId` (double, optional) - `verifyingContract` (string, optional) - `salt` (string, optional) ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf2Message - `nonce` (double, required) - `from` (string, required) - `functionSignature` (string, required) ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeEip712MessagePermittedAmount - string - double - any ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaTradeEip712MessageSlippageAndActionsMinAmountOut - string - double - any ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf0TypesEip712DomainItems - `name` (string, required) - `type` (string, required) ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf0TypesPermitItems - `name` (string, required) - `type` (string, required) ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf1TypesEip712DomainItems - `name` (string, required) - `type` (string, required) ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf1TypesPermitItems - `name` (string, required) - `type` (string, required) ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf2TypesEip712DomainItems - `name` (string, required) - `type` (string, required) ### GaslessSubmitPostRequestBodyContentApplicationJsonSchemaApprovalEip712OneOf2TypesMetaTransactionItems - `name` (string, required) - `type` (string, required) ## Examples **Request** ```json { "chainId": 8453, "trade": { "type": "settler_metatransaction", "eip712": { "types": { "PermitWitnessTransferFrom": [ { "name": "permitted", "type": "TokenPermissions" }, { "name": "spender", "type": "address" }, { "name": "nonce", "type": "uint256" }, { "name": "deadline", "type": "uint256" }, { "name": "slippageAndActions", "type": "SlippageAndActions" } ], "TokenPermissions": [ { "name": "token", "type": "address" }, { "name": "amount", "type": "uint256" } ], "EIP712Domain": [ { "name": "name", "type": "string" }, { "name": "chainId", "type": "uint256" }, { "name": "verifyingContract", "type": "address" } ], "SlippageAndActions": [ { "name": "recipient", "type": "address" }, { "name": "buyToken", "type": "address" }, { "name": "minAmountOut", "type": "uint256" }, { "name": "actions", "type": "bytes[]" } ] }, "primaryType": "PermitWitnessTransferFrom", "domain": { "name": "Permit2", "chainId": 8453, "verifyingContract": "0x000000000022d473030f116ddee9f6b43ac78ba3" }, "message": { "permitted": { "token": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913", "amount": "50000000" }, "spender": "0x5ce929ddb01804bff35b2f5c77b735bdb094aac8", "nonce": "2241959297937691820908574931991585", "deadline": "1718672122", "slippageAndActions": { "recipient": "0x70a9f34f9b34c64957b9c401a97bfed35b95049e", "buyToken": "0x50c5725949a6f0c72e6c4a641f24049a917db0cb", "minAmountOut": "49793430139340757517", "actions": [ "0x0dfeb4190000000000000000000000005ce929ddb01804bff35b2f5c77b735bdb094aac8000000000000000000000000833589fcd6edb6e08f4c7c32d4f71b54bda029130000000000000000000000000000000000000000000000000000000002faf0800000000000000000000000000000000000006e898131631616b1779bad70bc21000000000000000000000000000000000000000000000000000000006670dafa", "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", "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" ] } } }, "signature": { "signatureType": 2, "v": 28, "r": "0xeaad7568c0d17ad9e1043a4dd41ce294ed51792a0fb8bed3a3318f7e1df3ff88", "s": "0x09444d25869d91946d7c26f9e5448c7fea369ba9c90deac1d761261565c487d2" } }, "approval": { "type": "permit", "eip712": { "types": { "EIP712Domain": [ { "name": "name", "type": "string" }, { "name": "version", "type": "string" }, { "name": "chainId", "type": "uint256" }, { "name": "verifyingContract", "type": "address" } ], "Permit": [ { "name": "owner", "type": "address" }, { "name": "spender", "type": "address" }, { "name": "value", "type": "uint256" }, { "name": "nonce", "type": "uint256" }, { "name": "deadline", "type": "uint256" } ] }, "domain": { "name": "USD Coin", "version": "2", "chainId": 8453, "verifyingContract": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913" }, "message": { "owner": "0x70a9f34f9b34c64957b9c401a97bfed35b95049e", "spender": "0x000000000022d473030f116ddee9f6b43ac78ba3", "value": "50000000", "nonce": 0, "deadline": "1718669123" }, "primaryType": "Permit" }, "signature": { "signatureType": 2, "v": 27, "r": "0xa1be4e6177d95f7e634d7cf8f93021b96e5e4f3d4d8605e85204b97d4a4060eb", "s": "0x371e85adcfa9a5d0f53cc9f467a4230305899e4a18c0174466b8da784a4f9c81" } } } ``` **Response** ```json { "tradeHash": "0xcb3285b35c024fca76037bea9ea4cb68645fed3bdd84030956577de2f1592aa9", "type": "settler_metatransaction", "zid": "0x111111111111111111111111" } ``` **SDK Code** ```python Gasless_submit_example import requests url = "https://api.0x.org/gasless/submit" payload = { "chainId": 8453, "trade": { "type": "settler_metatransaction", "eip712": { "types": { "PermitWitnessTransferFrom": [ { "name": "permitted", "type": "TokenPermissions" }, { "name": "spender", "type": "address" }, { "name": "nonce", "type": "uint256" }, { "name": "deadline", "type": "uint256" }, { "name": "slippageAndActions", "type": "SlippageAndActions" } ], "TokenPermissions": [ { "name": "token", "type": "address" }, { "name": "amount", "type": "uint256" } ], "EIP712Domain": [ { "name": "name", "type": "string" }, { "name": "chainId", "type": "uint256" }, { "name": "verifyingContract", "type": "address" } ], "SlippageAndActions": [ { "name": "recipient", "type": "address" }, { "name": "buyToken", "type": "address" }, { "name": "minAmountOut", "type": "uint256" }, { "name": "actions", "type": "bytes[]" } ] }, "primaryType": "PermitWitnessTransferFrom", "domain": { "name": "Permit2", "chainId": 8453, "verifyingContract": "0x000000000022d473030f116ddee9f6b43ac78ba3" }, "message": { "permitted": { "token": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913", "amount": "50000000" }, "spender": "0x5ce929ddb01804bff35b2f5c77b735bdb094aac8", "nonce": "2241959297937691820908574931991585", "deadline": "1718672122", "slippageAndActions": { "recipient": "0x70a9f34f9b34c64957b9c401a97bfed35b95049e", "buyToken": "0x50c5725949a6f0c72e6c4a641f24049a917db0cb", "minAmountOut": "49793430139340757517", "actions": ["0x0dfeb4190000000000000000000000005ce929ddb01804bff35b2f5c77b735bdb094aac8000000000000000000000000833589fcd6edb6e08f4c7c32d4f71b54bda029130000000000000000000000000000000000000000000000000000000002faf0800000000000000000000000000000000000006e898131631616b1779bad70bc21000000000000000000000000000000000000000000000000000000006670dafa", "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", "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"] } } }, "signature": { "signatureType": 2, "v": 28, "r": "0xeaad7568c0d17ad9e1043a4dd41ce294ed51792a0fb8bed3a3318f7e1df3ff88", "s": "0x09444d25869d91946d7c26f9e5448c7fea369ba9c90deac1d761261565c487d2" } }, "approval": { "type": "permit", "eip712": { "types": { "EIP712Domain": [ { "name": "name", "type": "string" }, { "name": "version", "type": "string" }, { "name": "chainId", "type": "uint256" }, { "name": "verifyingContract", "type": "address" } ], "Permit": [ { "name": "owner", "type": "address" }, { "name": "spender", "type": "address" }, { "name": "value", "type": "uint256" }, { "name": "nonce", "type": "uint256" }, { "name": "deadline", "type": "uint256" } ] }, "domain": { "name": "USD Coin", "version": "2", "chainId": 8453, "verifyingContract": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913" }, "message": { "owner": "0x70a9f34f9b34c64957b9c401a97bfed35b95049e", "spender": "0x000000000022d473030f116ddee9f6b43ac78ba3", "value": "50000000", "nonce": 0, "deadline": "1718669123" }, "primaryType": "Permit" }, "signature": { "signatureType": 2, "v": 27, "r": "0xa1be4e6177d95f7e634d7cf8f93021b96e5e4f3d4d8605e85204b97d4a4060eb", "s": "0x371e85adcfa9a5d0f53cc9f467a4230305899e4a18c0174466b8da784a4f9c81" } } } headers = { "0x-api-key": "0x-api-key", "0x-version": "v2", "Content-Type": "application/json" } response = requests.post(url, json=payload, headers=headers) print(response.json()) ``` ```javascript Gasless_submit_example const url = 'https://api.0x.org/gasless/submit'; const options = { method: 'POST', headers: { '0x-api-key': '0x-api-key', '0x-version': 'v2', 'Content-Type': 'application/json' }, body: '{"chainId":8453,"trade":{"type":"settler_metatransaction","eip712":{"types":{"PermitWitnessTransferFrom":[{"name":"permitted","type":"TokenPermissions"},{"name":"spender","type":"address"},{"name":"nonce","type":"uint256"},{"name":"deadline","type":"uint256"},{"name":"slippageAndActions","type":"SlippageAndActions"}],"TokenPermissions":[{"name":"token","type":"address"},{"name":"amount","type":"uint256"}],"EIP712Domain":[{"name":"name","type":"string"},{"name":"chainId","type":"uint256"},{"name":"verifyingContract","type":"address"}],"SlippageAndActions":[{"name":"recipient","type":"address"},{"name":"buyToken","type":"address"},{"name":"minAmountOut","type":"uint256"},{"name":"actions","type":"bytes[]"}]},"primaryType":"PermitWitnessTransferFrom","domain":{"name":"Permit2","chainId":8453,"verifyingContract":"0x000000000022d473030f116ddee9f6b43ac78ba3"},"message":{"permitted":{"token":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","amount":"50000000"},"spender":"0x5ce929ddb01804bff35b2f5c77b735bdb094aac8","nonce":"2241959297937691820908574931991585","deadline":"1718672122","slippageAndActions":{"recipient":"0x70a9f34f9b34c64957b9c401a97bfed35b95049e","buyToken":"0x50c5725949a6f0c72e6c4a641f24049a917db0cb","minAmountOut":"49793430139340757517","actions":["0x0dfeb4190000000000000000000000005ce929ddb01804bff35b2f5c77b735bdb094aac8000000000000000000000000833589fcd6edb6e08f4c7c32d4f71b54bda029130000000000000000000000000000000000000000000000000000000002faf0800000000000000000000000000000000000006e898131631616b1779bad70bc21000000000000000000000000000000000000000000000000000000006670dafa","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","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"]}}},"signature":{"signatureType":2,"v":28,"r":"0xeaad7568c0d17ad9e1043a4dd41ce294ed51792a0fb8bed3a3318f7e1df3ff88","s":"0x09444d25869d91946d7c26f9e5448c7fea369ba9c90deac1d761261565c487d2"}},"approval":{"type":"permit","eip712":{"types":{"EIP712Domain":[{"name":"name","type":"string"},{"name":"version","type":"string"},{"name":"chainId","type":"uint256"},{"name":"verifyingContract","type":"address"}],"Permit":[{"name":"owner","type":"address"},{"name":"spender","type":"address"},{"name":"value","type":"uint256"},{"name":"nonce","type":"uint256"},{"name":"deadline","type":"uint256"}]},"domain":{"name":"USD Coin","version":"2","chainId":8453,"verifyingContract":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913"},"message":{"owner":"0x70a9f34f9b34c64957b9c401a97bfed35b95049e","spender":"0x000000000022d473030f116ddee9f6b43ac78ba3","value":"50000000","nonce":0,"deadline":"1718669123"},"primaryType":"Permit"},"signature":{"signatureType":2,"v":27,"r":"0xa1be4e6177d95f7e634d7cf8f93021b96e5e4f3d4d8605e85204b97d4a4060eb","s":"0x371e85adcfa9a5d0f53cc9f467a4230305899e4a18c0174466b8da784a4f9c81"}}}' }; try { const response = await fetch(url, options); const data = await response.json(); console.log(data); } catch (error) { console.error(error); } ``` ```go Gasless_submit_example package main import ( "fmt" "strings" "net/http" "io" ) func main() { url := "https://api.0x.org/gasless/submit" payload := strings.NewReader("{\n \"chainId\": 8453,\n \"trade\": {\n \"type\": \"settler_metatransaction\",\n \"eip712\": {\n \"types\": {\n \"PermitWitnessTransferFrom\": [\n {\n \"name\": \"permitted\",\n \"type\": \"TokenPermissions\"\n },\n {\n \"name\": \"spender\",\n \"type\": \"address\"\n },\n {\n \"name\": \"nonce\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"deadline\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"slippageAndActions\",\n \"type\": \"SlippageAndActions\"\n }\n ],\n \"TokenPermissions\": [\n {\n \"name\": \"token\",\n \"type\": \"address\"\n },\n {\n \"name\": \"amount\",\n \"type\": \"uint256\"\n }\n ],\n \"EIP712Domain\": [\n {\n \"name\": \"name\",\n \"type\": \"string\"\n },\n {\n \"name\": \"chainId\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"verifyingContract\",\n \"type\": \"address\"\n }\n ],\n \"SlippageAndActions\": [\n {\n \"name\": \"recipient\",\n \"type\": \"address\"\n },\n {\n \"name\": \"buyToken\",\n \"type\": \"address\"\n },\n {\n \"name\": \"minAmountOut\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"actions\",\n \"type\": \"bytes[]\"\n }\n ]\n },\n \"primaryType\": \"PermitWitnessTransferFrom\",\n \"domain\": {\n \"name\": \"Permit2\",\n \"chainId\": 8453,\n \"verifyingContract\": \"0x000000000022d473030f116ddee9f6b43ac78ba3\"\n },\n \"message\": {\n \"permitted\": {\n \"token\": \"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913\",\n \"amount\": \"50000000\"\n },\n \"spender\": \"0x5ce929ddb01804bff35b2f5c77b735bdb094aac8\",\n \"nonce\": \"2241959297937691820908574931991585\",\n \"deadline\": \"1718672122\",\n \"slippageAndActions\": {\n \"recipient\": \"0x70a9f34f9b34c64957b9c401a97bfed35b95049e\",\n \"buyToken\": \"0x50c5725949a6f0c72e6c4a641f24049a917db0cb\",\n \"minAmountOut\": \"49793430139340757517\",\n \"actions\": [\n \"0x0dfeb4190000000000000000000000005ce929ddb01804bff35b2f5c77b735bdb094aac8000000000000000000000000833589fcd6edb6e08f4c7c32d4f71b54bda029130000000000000000000000000000000000000000000000000000000002faf0800000000000000000000000000000000000006e898131631616b1779bad70bc21000000000000000000000000000000000000000000000000000000006670dafa\",\n \"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\",\n \"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\"\n ]\n }\n }\n },\n \"signature\": {\n \"signatureType\": 2,\n \"v\": 28,\n \"r\": \"0xeaad7568c0d17ad9e1043a4dd41ce294ed51792a0fb8bed3a3318f7e1df3ff88\",\n \"s\": \"0x09444d25869d91946d7c26f9e5448c7fea369ba9c90deac1d761261565c487d2\"\n }\n },\n \"approval\": {\n \"type\": \"permit\",\n \"eip712\": {\n \"types\": {\n \"EIP712Domain\": [\n {\n \"name\": \"name\",\n \"type\": \"string\"\n },\n {\n \"name\": \"version\",\n \"type\": \"string\"\n },\n {\n \"name\": \"chainId\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"verifyingContract\",\n \"type\": \"address\"\n }\n ],\n \"Permit\": [\n {\n \"name\": \"owner\",\n \"type\": \"address\"\n },\n {\n \"name\": \"spender\",\n \"type\": \"address\"\n },\n {\n \"name\": \"value\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"nonce\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"deadline\",\n \"type\": \"uint256\"\n }\n ]\n },\n \"domain\": {\n \"name\": \"USD Coin\",\n \"version\": \"2\",\n \"chainId\": 8453,\n \"verifyingContract\": \"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913\"\n },\n \"message\": {\n \"owner\": \"0x70a9f34f9b34c64957b9c401a97bfed35b95049e\",\n \"spender\": \"0x000000000022d473030f116ddee9f6b43ac78ba3\",\n \"value\": \"50000000\",\n \"nonce\": 0,\n \"deadline\": \"1718669123\"\n },\n \"primaryType\": \"Permit\"\n },\n \"signature\": {\n \"signatureType\": 2,\n \"v\": 27,\n \"r\": \"0xa1be4e6177d95f7e634d7cf8f93021b96e5e4f3d4d8605e85204b97d4a4060eb\",\n \"s\": \"0x371e85adcfa9a5d0f53cc9f467a4230305899e4a18c0174466b8da784a4f9c81\"\n }\n }\n}") req, _ := http.NewRequest("POST", url, payload) req.Header.Add("0x-api-key", "0x-api-key") req.Header.Add("0x-version", "v2") req.Header.Add("Content-Type", "application/json") res, _ := http.DefaultClient.Do(req) defer res.Body.Close() body, _ := io.ReadAll(res.Body) fmt.Println(res) fmt.Println(string(body)) } ``` ```ruby Gasless_submit_example require 'uri' require 'net/http' url = URI("https://api.0x.org/gasless/submit") http = Net::HTTP.new(url.host, url.port) http.use_ssl = true request = Net::HTTP::Post.new(url) request["0x-api-key"] = '0x-api-key' request["0x-version"] = 'v2' request["Content-Type"] = 'application/json' request.body = "{\n \"chainId\": 8453,\n \"trade\": {\n \"type\": \"settler_metatransaction\",\n \"eip712\": {\n \"types\": {\n \"PermitWitnessTransferFrom\": [\n {\n \"name\": \"permitted\",\n \"type\": \"TokenPermissions\"\n },\n {\n \"name\": \"spender\",\n \"type\": \"address\"\n },\n {\n \"name\": \"nonce\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"deadline\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"slippageAndActions\",\n \"type\": \"SlippageAndActions\"\n }\n ],\n \"TokenPermissions\": [\n {\n \"name\": \"token\",\n \"type\": \"address\"\n },\n {\n \"name\": \"amount\",\n \"type\": \"uint256\"\n }\n ],\n \"EIP712Domain\": [\n {\n \"name\": \"name\",\n \"type\": \"string\"\n },\n {\n \"name\": \"chainId\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"verifyingContract\",\n \"type\": \"address\"\n }\n ],\n \"SlippageAndActions\": [\n {\n \"name\": \"recipient\",\n \"type\": \"address\"\n },\n {\n \"name\": \"buyToken\",\n \"type\": \"address\"\n },\n {\n \"name\": \"minAmountOut\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"actions\",\n \"type\": \"bytes[]\"\n }\n ]\n },\n \"primaryType\": \"PermitWitnessTransferFrom\",\n \"domain\": {\n \"name\": \"Permit2\",\n \"chainId\": 8453,\n \"verifyingContract\": \"0x000000000022d473030f116ddee9f6b43ac78ba3\"\n },\n \"message\": {\n \"permitted\": {\n \"token\": \"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913\",\n \"amount\": \"50000000\"\n },\n \"spender\": \"0x5ce929ddb01804bff35b2f5c77b735bdb094aac8\",\n \"nonce\": \"2241959297937691820908574931991585\",\n \"deadline\": \"1718672122\",\n \"slippageAndActions\": {\n \"recipient\": \"0x70a9f34f9b34c64957b9c401a97bfed35b95049e\",\n \"buyToken\": \"0x50c5725949a6f0c72e6c4a641f24049a917db0cb\",\n \"minAmountOut\": \"49793430139340757517\",\n \"actions\": [\n \"0x0dfeb4190000000000000000000000005ce929ddb01804bff35b2f5c77b735bdb094aac8000000000000000000000000833589fcd6edb6e08f4c7c32d4f71b54bda029130000000000000000000000000000000000000000000000000000000002faf0800000000000000000000000000000000000006e898131631616b1779bad70bc21000000000000000000000000000000000000000000000000000000006670dafa\",\n \"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\",\n \"0x38c9c14700000000000000000000000050c5725949a6f0c72e6c4a641f24049a917db0cb000000000000000000000000000000000000000000000000000000000000001000000000000000000000000050c5725949a6f0c72e6c4a641f24049a917db0cb000000000000000000000000000000000000000000000000000000000000002400000000000000000000000000000000000000000000000000000000000000a00000000000000000000000000000000000000000000000000000000000000044a9059cbb0000000000000000000000009f6601854dee374b1bfaf6350ffd27a97309d431000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"\n ]\n }\n }\n },\n \"signature\": {\n \"signatureType\": 2,\n \"v\": 28,\n \"r\": \"0xeaad7568c0d17ad9e1043a4dd41ce294ed51792a0fb8bed3a3318f7e1df3ff88\",\n \"s\": \"0x09444d25869d91946d7c26f9e5448c7fea369ba9c90deac1d761261565c487d2\"\n }\n },\n \"approval\": {\n \"type\": \"permit\",\n \"eip712\": {\n \"types\": {\n \"EIP712Domain\": [\n {\n \"name\": \"name\",\n \"type\": \"string\"\n },\n {\n \"name\": \"version\",\n \"type\": \"string\"\n },\n {\n \"name\": \"chainId\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"verifyingContract\",\n \"type\": \"address\"\n }\n ],\n \"Permit\": [\n {\n \"name\": \"owner\",\n \"type\": \"address\"\n },\n {\n \"name\": \"spender\",\n \"type\": \"address\"\n },\n {\n \"name\": \"value\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"nonce\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"deadline\",\n \"type\": \"uint256\"\n }\n ]\n },\n \"domain\": {\n \"name\": \"USD Coin\",\n \"version\": \"2\",\n \"chainId\": 8453,\n \"verifyingContract\": \"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913\"\n },\n \"message\": {\n \"owner\": \"0x70a9f34f9b34c64957b9c401a97bfed35b95049e\",\n \"spender\": \"0x000000000022d473030f116ddee9f6b43ac78ba3\",\n \"value\": \"50000000\",\n \"nonce\": 0,\n \"deadline\": \"1718669123\"\n },\n \"primaryType\": \"Permit\"\n },\n \"signature\": {\n \"signatureType\": 2,\n \"v\": 27,\n \"r\": \"0xa1be4e6177d95f7e634d7cf8f93021b96e5e4f3d4d8605e85204b97d4a4060eb\",\n \"s\": \"0x371e85adcfa9a5d0f53cc9f467a4230305899e4a18c0174466b8da784a4f9c81\"\n }\n }\n}" response = http.request(request) puts response.read_body ``` ```java Gasless_submit_example import com.mashape.unirest.http.HttpResponse; import com.mashape.unirest.http.Unirest; HttpResponse response = Unirest.post("https://api.0x.org/gasless/submit") .header("0x-api-key", "0x-api-key") .header("0x-version", "v2") .header("Content-Type", "application/json") .body("{\n \"chainId\": 8453,\n \"trade\": {\n \"type\": \"settler_metatransaction\",\n \"eip712\": {\n \"types\": {\n \"PermitWitnessTransferFrom\": [\n {\n \"name\": \"permitted\",\n \"type\": \"TokenPermissions\"\n },\n {\n \"name\": \"spender\",\n \"type\": \"address\"\n },\n {\n \"name\": \"nonce\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"deadline\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"slippageAndActions\",\n \"type\": \"SlippageAndActions\"\n }\n ],\n \"TokenPermissions\": [\n {\n \"name\": \"token\",\n \"type\": \"address\"\n },\n {\n \"name\": \"amount\",\n \"type\": \"uint256\"\n }\n ],\n \"EIP712Domain\": [\n {\n \"name\": \"name\",\n \"type\": \"string\"\n },\n {\n \"name\": \"chainId\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"verifyingContract\",\n \"type\": \"address\"\n }\n ],\n \"SlippageAndActions\": [\n {\n \"name\": \"recipient\",\n \"type\": \"address\"\n },\n {\n \"name\": \"buyToken\",\n \"type\": \"address\"\n },\n {\n \"name\": \"minAmountOut\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"actions\",\n \"type\": \"bytes[]\"\n }\n ]\n },\n \"primaryType\": \"PermitWitnessTransferFrom\",\n \"domain\": {\n \"name\": \"Permit2\",\n \"chainId\": 8453,\n \"verifyingContract\": \"0x000000000022d473030f116ddee9f6b43ac78ba3\"\n },\n \"message\": {\n \"permitted\": {\n \"token\": \"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913\",\n \"amount\": \"50000000\"\n },\n \"spender\": \"0x5ce929ddb01804bff35b2f5c77b735bdb094aac8\",\n \"nonce\": \"2241959297937691820908574931991585\",\n \"deadline\": \"1718672122\",\n \"slippageAndActions\": {\n \"recipient\": \"0x70a9f34f9b34c64957b9c401a97bfed35b95049e\",\n \"buyToken\": \"0x50c5725949a6f0c72e6c4a641f24049a917db0cb\",\n \"minAmountOut\": \"49793430139340757517\",\n \"actions\": [\n \"0x0dfeb4190000000000000000000000005ce929ddb01804bff35b2f5c77b735bdb094aac8000000000000000000000000833589fcd6edb6e08f4c7c32d4f71b54bda029130000000000000000000000000000000000000000000000000000000002faf0800000000000000000000000000000000000006e898131631616b1779bad70bc21000000000000000000000000000000000000000000000000000000006670dafa\",\n \"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\",\n \"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\"\n ]\n }\n }\n },\n \"signature\": {\n \"signatureType\": 2,\n \"v\": 28,\n \"r\": \"0xeaad7568c0d17ad9e1043a4dd41ce294ed51792a0fb8bed3a3318f7e1df3ff88\",\n \"s\": \"0x09444d25869d91946d7c26f9e5448c7fea369ba9c90deac1d761261565c487d2\"\n }\n },\n \"approval\": {\n \"type\": \"permit\",\n \"eip712\": {\n \"types\": {\n \"EIP712Domain\": [\n {\n \"name\": \"name\",\n \"type\": \"string\"\n },\n {\n \"name\": \"version\",\n \"type\": \"string\"\n },\n {\n \"name\": \"chainId\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"verifyingContract\",\n \"type\": \"address\"\n }\n ],\n \"Permit\": [\n {\n \"name\": \"owner\",\n \"type\": \"address\"\n },\n {\n \"name\": \"spender\",\n \"type\": \"address\"\n },\n {\n \"name\": \"value\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"nonce\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"deadline\",\n \"type\": \"uint256\"\n }\n ]\n },\n \"domain\": {\n \"name\": \"USD Coin\",\n \"version\": \"2\",\n \"chainId\": 8453,\n \"verifyingContract\": \"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913\"\n },\n \"message\": {\n \"owner\": \"0x70a9f34f9b34c64957b9c401a97bfed35b95049e\",\n \"spender\": \"0x000000000022d473030f116ddee9f6b43ac78ba3\",\n \"value\": \"50000000\",\n \"nonce\": 0,\n \"deadline\": \"1718669123\"\n },\n \"primaryType\": \"Permit\"\n },\n \"signature\": {\n \"signatureType\": 2,\n \"v\": 27,\n \"r\": \"0xa1be4e6177d95f7e634d7cf8f93021b96e5e4f3d4d8605e85204b97d4a4060eb\",\n \"s\": \"0x371e85adcfa9a5d0f53cc9f467a4230305899e4a18c0174466b8da784a4f9c81\"\n }\n }\n}") .asString(); ``` ```php Gasless_submit_example request('POST', 'https://api.0x.org/gasless/submit', [ 'body' => '{ "chainId": 8453, "trade": { "type": "settler_metatransaction", "eip712": { "types": { "PermitWitnessTransferFrom": [ { "name": "permitted", "type": "TokenPermissions" }, { "name": "spender", "type": "address" }, { "name": "nonce", "type": "uint256" }, { "name": "deadline", "type": "uint256" }, { "name": "slippageAndActions", "type": "SlippageAndActions" } ], "TokenPermissions": [ { "name": "token", "type": "address" }, { "name": "amount", "type": "uint256" } ], "EIP712Domain": [ { "name": "name", "type": "string" }, { "name": "chainId", "type": "uint256" }, { "name": "verifyingContract", "type": "address" } ], "SlippageAndActions": [ { "name": "recipient", "type": "address" }, { "name": "buyToken", "type": "address" }, { "name": "minAmountOut", "type": "uint256" }, { "name": "actions", "type": "bytes[]" } ] }, "primaryType": "PermitWitnessTransferFrom", "domain": { "name": "Permit2", "chainId": 8453, "verifyingContract": "0x000000000022d473030f116ddee9f6b43ac78ba3" }, "message": { "permitted": { "token": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913", "amount": "50000000" }, "spender": "0x5ce929ddb01804bff35b2f5c77b735bdb094aac8", "nonce": "2241959297937691820908574931991585", "deadline": "1718672122", "slippageAndActions": { "recipient": "0x70a9f34f9b34c64957b9c401a97bfed35b95049e", "buyToken": "0x50c5725949a6f0c72e6c4a641f24049a917db0cb", "minAmountOut": "49793430139340757517", "actions": [ "0x0dfeb4190000000000000000000000005ce929ddb01804bff35b2f5c77b735bdb094aac8000000000000000000000000833589fcd6edb6e08f4c7c32d4f71b54bda029130000000000000000000000000000000000000000000000000000000002faf0800000000000000000000000000000000000006e898131631616b1779bad70bc21000000000000000000000000000000000000000000000000000000006670dafa", "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", "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" ] } } }, "signature": { "signatureType": 2, "v": 28, "r": "0xeaad7568c0d17ad9e1043a4dd41ce294ed51792a0fb8bed3a3318f7e1df3ff88", "s": "0x09444d25869d91946d7c26f9e5448c7fea369ba9c90deac1d761261565c487d2" } }, "approval": { "type": "permit", "eip712": { "types": { "EIP712Domain": [ { "name": "name", "type": "string" }, { "name": "version", "type": "string" }, { "name": "chainId", "type": "uint256" }, { "name": "verifyingContract", "type": "address" } ], "Permit": [ { "name": "owner", "type": "address" }, { "name": "spender", "type": "address" }, { "name": "value", "type": "uint256" }, { "name": "nonce", "type": "uint256" }, { "name": "deadline", "type": "uint256" } ] }, "domain": { "name": "USD Coin", "version": "2", "chainId": 8453, "verifyingContract": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913" }, "message": { "owner": "0x70a9f34f9b34c64957b9c401a97bfed35b95049e", "spender": "0x000000000022d473030f116ddee9f6b43ac78ba3", "value": "50000000", "nonce": 0, "deadline": "1718669123" }, "primaryType": "Permit" }, "signature": { "signatureType": 2, "v": 27, "r": "0xa1be4e6177d95f7e634d7cf8f93021b96e5e4f3d4d8605e85204b97d4a4060eb", "s": "0x371e85adcfa9a5d0f53cc9f467a4230305899e4a18c0174466b8da784a4f9c81" } } }', 'headers' => [ '0x-api-key' => '0x-api-key', '0x-version' => 'v2', 'Content-Type' => 'application/json', ], ]); echo $response->getBody(); ``` ```csharp Gasless_submit_example using RestSharp; var client = new RestClient("https://api.0x.org/gasless/submit"); var request = new RestRequest(Method.POST); request.AddHeader("0x-api-key", "0x-api-key"); request.AddHeader("0x-version", "v2"); request.AddHeader("Content-Type", "application/json"); request.AddParameter("application/json", "{\n \"chainId\": 8453,\n \"trade\": {\n \"type\": \"settler_metatransaction\",\n \"eip712\": {\n \"types\": {\n \"PermitWitnessTransferFrom\": [\n {\n \"name\": \"permitted\",\n \"type\": \"TokenPermissions\"\n },\n {\n \"name\": \"spender\",\n \"type\": \"address\"\n },\n {\n \"name\": \"nonce\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"deadline\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"slippageAndActions\",\n \"type\": \"SlippageAndActions\"\n }\n ],\n \"TokenPermissions\": [\n {\n \"name\": \"token\",\n \"type\": \"address\"\n },\n {\n \"name\": \"amount\",\n \"type\": \"uint256\"\n }\n ],\n \"EIP712Domain\": [\n {\n \"name\": \"name\",\n \"type\": \"string\"\n },\n {\n \"name\": \"chainId\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"verifyingContract\",\n \"type\": \"address\"\n }\n ],\n \"SlippageAndActions\": [\n {\n \"name\": \"recipient\",\n \"type\": \"address\"\n },\n {\n \"name\": \"buyToken\",\n \"type\": \"address\"\n },\n {\n \"name\": \"minAmountOut\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"actions\",\n \"type\": \"bytes[]\"\n }\n ]\n },\n \"primaryType\": \"PermitWitnessTransferFrom\",\n \"domain\": {\n \"name\": \"Permit2\",\n \"chainId\": 8453,\n \"verifyingContract\": \"0x000000000022d473030f116ddee9f6b43ac78ba3\"\n },\n \"message\": {\n \"permitted\": {\n \"token\": \"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913\",\n \"amount\": \"50000000\"\n },\n \"spender\": \"0x5ce929ddb01804bff35b2f5c77b735bdb094aac8\",\n \"nonce\": \"2241959297937691820908574931991585\",\n \"deadline\": \"1718672122\",\n \"slippageAndActions\": {\n \"recipient\": \"0x70a9f34f9b34c64957b9c401a97bfed35b95049e\",\n \"buyToken\": \"0x50c5725949a6f0c72e6c4a641f24049a917db0cb\",\n \"minAmountOut\": \"49793430139340757517\",\n \"actions\": [\n \"0x0dfeb4190000000000000000000000005ce929ddb01804bff35b2f5c77b735bdb094aac8000000000000000000000000833589fcd6edb6e08f4c7c32d4f71b54bda029130000000000000000000000000000000000000000000000000000000002faf0800000000000000000000000000000000000006e898131631616b1779bad70bc21000000000000000000000000000000000000000000000000000000006670dafa\",\n \"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\",\n \"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\"\n ]\n }\n }\n },\n \"signature\": {\n \"signatureType\": 2,\n \"v\": 28,\n \"r\": \"0xeaad7568c0d17ad9e1043a4dd41ce294ed51792a0fb8bed3a3318f7e1df3ff88\",\n \"s\": \"0x09444d25869d91946d7c26f9e5448c7fea369ba9c90deac1d761261565c487d2\"\n }\n },\n \"approval\": {\n \"type\": \"permit\",\n \"eip712\": {\n \"types\": {\n \"EIP712Domain\": [\n {\n \"name\": \"name\",\n \"type\": \"string\"\n },\n {\n \"name\": \"version\",\n \"type\": \"string\"\n },\n {\n \"name\": \"chainId\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"verifyingContract\",\n \"type\": \"address\"\n }\n ],\n \"Permit\": [\n {\n \"name\": \"owner\",\n \"type\": \"address\"\n },\n {\n \"name\": \"spender\",\n \"type\": \"address\"\n },\n {\n \"name\": \"value\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"nonce\",\n \"type\": \"uint256\"\n },\n {\n \"name\": \"deadline\",\n \"type\": \"uint256\"\n }\n ]\n },\n \"domain\": {\n \"name\": \"USD Coin\",\n \"version\": \"2\",\n \"chainId\": 8453,\n \"verifyingContract\": \"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913\"\n },\n \"message\": {\n \"owner\": \"0x70a9f34f9b34c64957b9c401a97bfed35b95049e\",\n \"spender\": \"0x000000000022d473030f116ddee9f6b43ac78ba3\",\n \"value\": \"50000000\",\n \"nonce\": 0,\n \"deadline\": \"1718669123\"\n },\n \"primaryType\": \"Permit\"\n },\n \"signature\": {\n \"signatureType\": 2,\n \"v\": 27,\n \"r\": \"0xa1be4e6177d95f7e634d7cf8f93021b96e5e4f3d4d8605e85204b97d4a4060eb\",\n \"s\": \"0x371e85adcfa9a5d0f53cc9f467a4230305899e4a18c0174466b8da784a4f9c81\"\n }\n }\n}", ParameterType.RequestBody); IRestResponse response = client.Execute(request); ``` ```swift Gasless_submit_example import Foundation let headers = [ "0x-api-key": "0x-api-key", "0x-version": "v2", "Content-Type": "application/json" ] let parameters = [ "chainId": 8453, "trade": [ "type": "settler_metatransaction", "eip712": [ "types": [ "PermitWitnessTransferFrom": [ [ "name": "permitted", "type": "TokenPermissions" ], [ "name": "spender", "type": "address" ], [ "name": "nonce", "type": "uint256" ], [ "name": "deadline", "type": "uint256" ], [ "name": "slippageAndActions", "type": "SlippageAndActions" ] ], "TokenPermissions": [ [ "name": "token", "type": "address" ], [ "name": "amount", "type": "uint256" ] ], "EIP712Domain": [ [ "name": "name", "type": "string" ], [ "name": "chainId", "type": "uint256" ], [ "name": "verifyingContract", "type": "address" ] ], "SlippageAndActions": [ [ "name": "recipient", "type": "address" ], [ "name": "buyToken", "type": "address" ], [ "name": "minAmountOut", "type": "uint256" ], [ "name": "actions", "type": "bytes[]" ] ] ], "primaryType": "PermitWitnessTransferFrom", "domain": [ "name": "Permit2", "chainId": 8453, "verifyingContract": "0x000000000022d473030f116ddee9f6b43ac78ba3" ], "message": [ "permitted": [ "token": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913", "amount": "50000000" ], "spender": "0x5ce929ddb01804bff35b2f5c77b735bdb094aac8", "nonce": "2241959297937691820908574931991585", "deadline": "1718672122", "slippageAndActions": [ "recipient": "0x70a9f34f9b34c64957b9c401a97bfed35b95049e", "buyToken": "0x50c5725949a6f0c72e6c4a641f24049a917db0cb", "minAmountOut": "49793430139340757517", "actions": ["0x0dfeb4190000000000000000000000005ce929ddb01804bff35b2f5c77b735bdb094aac8000000000000000000000000833589fcd6edb6e08f4c7c32d4f71b54bda029130000000000000000000000000000000000000000000000000000000002faf0800000000000000000000000000000000000006e898131631616b1779bad70bc21000000000000000000000000000000000000000000000000000000006670dafa", "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", "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"] ] ] ], "signature": [ "signatureType": 2, "v": 28, "r": "0xeaad7568c0d17ad9e1043a4dd41ce294ed51792a0fb8bed3a3318f7e1df3ff88", "s": "0x09444d25869d91946d7c26f9e5448c7fea369ba9c90deac1d761261565c487d2" ] ], "approval": [ "type": "permit", "eip712": [ "types": [ "EIP712Domain": [ [ "name": "name", "type": "string" ], [ "name": "version", "type": "string" ], [ "name": "chainId", "type": "uint256" ], [ "name": "verifyingContract", "type": "address" ] ], "Permit": [ [ "name": "owner", "type": "address" ], [ "name": "spender", "type": "address" ], [ "name": "value", "type": "uint256" ], [ "name": "nonce", "type": "uint256" ], [ "name": "deadline", "type": "uint256" ] ] ], "domain": [ "name": "USD Coin", "version": "2", "chainId": 8453, "verifyingContract": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913" ], "message": [ "owner": "0x70a9f34f9b34c64957b9c401a97bfed35b95049e", "spender": "0x000000000022d473030f116ddee9f6b43ac78ba3", "value": "50000000", "nonce": 0, "deadline": "1718669123" ], "primaryType": "Permit" ], "signature": [ "signatureType": 2, "v": 27, "r": "0xa1be4e6177d95f7e634d7cf8f93021b96e5e4f3d4d8605e85204b97d4a4060eb", "s": "0x371e85adcfa9a5d0f53cc9f467a4230305899e4a18c0174466b8da784a4f9c81" ] ] ] as [String : Any] let postData = JSONSerialization.data(withJSONObject: parameters, options: []) let request = NSMutableURLRequest(url: NSURL(string: "https://api.0x.org/gasless/submit")! as URL, cachePolicy: .useProtocolCachePolicy, timeoutInterval: 10.0) request.httpMethod = "POST" request.allHTTPHeaderFields = headers request.httpBody = postData as Data let session = URLSession.shared let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in if (error != nil) { print(error as Any) } else { let httpResponse = response as? HTTPURLResponse print(httpResponse) } }) dataTask.resume() ```