Introduction

What is the 0x Cross Chain API?

The 0x Cross Chain API is a fast, flexible API that lets developers programmatically access tokens across various blockchains, enabling cross-chain swap functionality in any app or wallet. It’s designed to provide the same powerful aggregation and transaction-building features that 0x offers for same-chain swaps - now available across EVM, Solana, and Tron chains.

Whether you’re building a new application, or expanding the offering of your existing product, this API helps you integrate cross-chain token swaps with minimal overhead and maximum efficiency.

How It Works

1. Get a quote — your app calls /quotes or /quotes/stream. The API queries multiple bridge providers and liquidity sources, then returns the best routes with ready-to-sign transactions.
2. Submit — the user signs and submits the origin transaction. On EVM chains, a token allowance may be required first (see issues.allowance in the response).
3. Bridge — the bridge provider picks up the order and delivers tokens to the destination chain. This takes seconds to minutes depending on the bridge.
4. Track — poll /status with the origin tx hash and quoteId. The status service monitors the bridge and reports progress through to completion or failure recovery.

Supported Chains and Providers

See Supported Chains and Providers for the full list with chain IDs, address formats, and bridge coverage.