Welcome to Across

Across is the fastest, cheapest, most secure and decentralized way to bridge tokens and execute crosschain swaps ⛺

Across is an interoperability protocol powered by intents. It enables the fastest and cheapest way to bridge funds with better security tradeoffs than traditional bridges. Developers can use Across to build production-ready crosschain apps in less than a day!

Introducing the Swap API

The Across Swap API unlocks your ability to initiate 1-click crosschain swaps directly from your application.

It allows users to bridge and swap tokens at the same time. The complexity is abstracted away, and it all happens with a single, composable contract call.

Integrate the Swap API Today!

Need Help ? Reach Out Here !

Learn more about Swap API here

Quickstart

Pick your learning path and learn how Across allows you to ship crosschain apps in the fastest and easiest way possible.

Integrate Across

Across can be easily integrated via our easy to use REST API into any application requiring instant, low cost crosschain value transfer. Let users easily onboard assets without leaving your app.

Start with the Bridge Integration Guide and progress to learn how you can make multichain and single chain experiences

Swap Integration Guide

Use the Swap API to get executable calldata and swap tokens instantly

Across SDK

Integrate crosschain swaps into your app quickly

Across APIs

Explore all Across APIs to securely interface with the protocol

Embedded Crosschain Actions

Build seamless staking, minting and more functionalities where bridging is abstracted away with Across

Concepts

Learn how embedded cross-chain actions work

Generic Multicaller Handler

Use our already-deployed and audited contract

Learn How Across Works

Deep-dive into Across and learn about the various actors that help build the fastest, most secure, low-cost and decentralized intent-based interoperable protocol.

Crosschain Intents

An intent is a type of order where a user specifies an outcome instead of an execution path

Intent Lifecycle

These steps are intended to fit into almost any system that requires crosschain transfers

ERC-7683 in Production

Explore how Across implements ERC-7683 by using AcrossOriginSettler contract

Relayers

Join the growing network of independent relayers. Earn up to 100% APY.

Running a Relayer

Technical instructions to follow and run your own Across V3 relayer

Relayer Nomination

A time-limited period of exclusivity to fill a given deposit for a relayer

Contracts and Chains

Across supports a large number of chains and the list is evergrowing as expand support and onboard ecosystems. You can learn all about the mainnet and testnet supported chains here

You can also find all the contract addresses for all the chains (mainnet and testnet) that Across supports here.

Developer and Community Support

We request all developers building on Across to join our discord server and gain instant help on any issues they face while integrating Across to their apps.

You can find more developer support resources here

The security of our protocol is extremely crucial. If you notice any bugs in the protocol, please report them here. You can also find details of our audits here.