Download OpenAPI Spec

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The 0x docs site automatically serves OpenAPI 3.1 specs for all APIs. No API key required to download.

Available specs

APIJSONYAML
EVM APIshttps://docs.0x.org/openapi/evm-apis.jsonhttps://docs.0x.org/openapi/evm-apis.yaml
Solana Swap APIshttps://docs.0x.org/openapi/solana-swap-apis.jsonhttps://docs.0x.org/openapi/solana-swap-apis.yaml
Cross-Chain APIshttps://docs.0x.org/openapi/cross-chain-apis.jsonhttps://docs.0x.org/openapi/cross-chain-apis.yaml

Download via curl

$# EVM APIs
$curl -o 0x-evm-apis.json https://docs.0x.org/openapi/evm-apis.json
$
$# Solana Swap APIs
$curl -o 0x-solana-swap-apis.json https://docs.0x.org/openapi/solana-swap-apis.json
$
$# Cross-Chain APIs
$curl -o 0x-cross-chain-apis.json https://docs.0x.org/openapi/cross-chain-apis.json

What’s included

EVM APIs — for EVM-compatible chains (Ethereum, Arbitrum, Base, Polygon, and more):

  • Swap API v2 — price quotes, firm quotes, and transaction assembly for token swaps
  • Gasless API v2 — gasless swap and approval flows via meta-transactions
  • Trade Analytics API — historical trade and volume data

Solana Swap APIs — for Solana (SVM):

  • Swap Instructions — versioned transaction data for Solana token swaps, ready to sign and submit

Cross-Chain APIs — for bridging assets across chains (EVM, Solana, Tron, HyperCore):

  • Quotes — ready-to-sign bridge quotes across supported chains and assets
  • Status — track the status of an in-flight cross-chain transaction
  • Sources — list supported bridge routes and liquidity sources
  • Transaction History — cross-chain transaction history for a wallet address
  • Streaming Quotes — live stream of cross-chain quotes

Each endpoint includes request parameters, response schemas, and example values.

Common use cases

AI coding assistants

Point your AI tool at the spec so it can generate accurate API calls without hallucinating endpoints or parameters:

  • Cursor / Copilot — add a spec URL as a context source
  • Claude — paste the spec URL or contents into your prompt
  • MCP — use the 0x MCP server to give your AI agent live access to the API

Postman

Import a spec directly into Postman to explore and test endpoints interactively:

  1. Open Postman → Import
  2. Paste the spec URL into the URL field
  3. Click Import — Postman generates a full collection with all endpoints

SDK generation

Use a spec to generate a typed client in any language.

OpenAPI Generator:

$openapi-generator-cli generate \
>  -i https://docs.0x.org/openapi/evm-apis.json \
>  -g typescript-fetch \
>  -o ./src/0x-client

Fern:

$fern add 0x --openapi https://docs.0x.org/openapi/evm-apis.json

Contract testing

Load a spec into a contract-testing framework (e.g. Dredd, Schemathesis) to validate that your integration stays in sync with the live API:

$schemathesis run https://docs.0x.org/openapi/evm-apis.json --validate-schema=true