Across is now live on Lens Chain!
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Across Documentation
V3 Developer Docs
V3 Developer Docs
  • 👋Introduction
    • Welcome to Across
    • What is Across?
    • Technical FAQ
    • Migration Guides
      • Migration from V2 to V3
      • Migration to CCTP
        • Migration Guide for Relayers
        • Migration Guide for API Users
      • Migration Guide for Non-EVM and Prefills
        • Breaking Changes for Indexers
        • Breaking Changes for API Users
        • Breaking Changes for Relayers
        • Testnet Environment for Migration
      • Solana Migration Guide
      • BNB Smart Chain Migration Guide
  • 🔗Use Cases
    • Instant Bridging in your Application
      • Bridge Integration Guide
      • Multichain Bridge UI Guide
      • Single Chain Bridge UI Guide
    • Embedded Crosschain Actions
      • Crosschain Actions Integration Guide
        • Using the Generic Multicaller Handler Contract
        • Using a Custom Handler Contract
      • Crosschain Actions UI Guide
    • Settle Crosschain Intents
  • 🧠Concepts
    • What are Crosschain Intents?
    • Intents Architecture in Across
    • Intent Lifecycle in Across
    • Canonical Asset Maximalism
  • 🛠️Reference
    • API Reference
    • App SDK Reference
    • Contracts
      • Aleph Zero
      • Arbitrum
      • Base
      • Blast
      • Ethereum
      • Linea
      • Ink
      • Lens
      • Lisk
      • Mode
      • Optimism
      • Polygon
      • Redstone
      • Scroll
      • Soneium
      • Unichain
      • World Chain
      • zkSync
      • Zora
    • Selected Contract Functions
    • Supported Chains
    • Fees in the System
    • Actors in the System
    • Security Model and Verification
      • Disputing Root Bundles
      • Validating Root Bundles
    • Tracking Events
  • 🔁Relayers
    • Running a Relayer
    • Relayer Nomination
  • 📚Resources
    • Release Notes
    • Developer Support
    • Bug Bounty
    • Audits
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On this page
  • Quickstart
  • Integrate Across
  • Embedded Crosschain Actions
  • Learn How Across Works
  • Relayers
  • Contracts and Chains
  • Developer and Community Support
  1. 👋Introduction

Welcome to Across

NextWhat is Across?

Last updated 1 month ago

LogoLogo

Products

  • Across Bridge
  • Across+
  • Across Settlement

Socials

  • Discord
  • Twitter
  • Medium
  • Forum

Resources

  • Blog
  • Across Brand Assets
  • Github

Routes

  • Bridge to Unichain
  • Bridge to Arbitrum
  • Bridge to Optimism
  • Bridge to Linea
  • Bridge to Polygon
  • Bridge to Base
  • Bridge to World Chain
  • Bridge to zkSync

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

Across is an interoperability protocol powered by intents. It is the first crosschain intents protocol in production today, enabling the fastest and lowest-cost way to transfer value with better security tradeoffs vs. traditional bridge designs.

Across is the perfect place for users to bridge funds cheaply, quickly and securely developers to build production-ready crosschain apps quickly.


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

Embedded Crosschain Actions

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

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.

Relayers

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


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.

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Bridge Integration Guide

Use Across APIs to request quotes and bridge funds instantly

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Across SDK

Integrate crosschain bridging into your app quickly

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Across APIs

Leverage Across APIs to securely interface with the protocol

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Concepts

Learn how embedded cross-chain actions work

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Generic Multicaller Handler

Use our already-deployed and audited contract

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Custom Multicaller Handler

build your own custom handler contract

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Crosschain Intents

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

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Intent Lifecycle

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

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ERC-7683 in Production

Explore how Across implements ERC-7683 by using AcrossOriginSettler contract

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Running a Relayer

Technical instructions to follow and run your own Across V3 relayer

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Relayer Nomination

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