> 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 full documentation content, see https://docs.0x.org/llms-full.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.0x.org/_mcp/server.

# Introduction

> Programmatically access tokens across blockchains with the 0x Cross-Chain API.

The 0x Cross-Chain API is in private beta. [Request access](https://0x.org/products/cross-chain) to start building.

## 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

<img src="https://files.buildwithfern.com/0x.docs.buildwithfern.com/fd93aaf4e299defa7efbd77ec4abb12e0524d358ada25d83875aae934e580c8c/docs/assets/img/cross-chain-api/diagram_intro_cross_chain.png" alt="0x Cross Chain API request flow" />

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](/docs/introduction/supported-chains#cross-chain-api) for the full list with chain IDs, address formats, and bridge coverage.