The Across API is being upgraded. V4 will be deprecated soon and integration support for V4 has ended. To learn more, reach out here.

Across DocsAcross Developer Documentation

Introduction Guides AI Agents Tools API Reference Chains & Contracts

Introduction

Welcome to Across Why Across Key Features API Keys & Integrator ID Across for Stablecoins Technical FAQ

Featured

Persistent Deposit Addresses Direct Route Linking

Developer Quickstart

Introduction to Swap API Working with Hypercore Hyperliquid Withdrawals

Fees in the System Actors in the System

Tracking Deposits and Refunds

Tracking Deposits Refunds

Relayers

Running a Relayer Relayer Nomination

Resources

The Bridge Across Bug Bounty Audits

Technical FAQ

Frequently asked questions about integrating Across Protocol.

Getting Started

Token Behavior

Deposits & Refunds

Deposit Addresses

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In-App Support

Across for Stablecoins

Move native USDC, USDT0, and USDH across chains with a single Swap API call.

Persistent Deposit Addresses

One POST returns a permanent deposit address — send funds from any supported origin chain and they are swept to your recipient on the destination.

On this page

Getting Started Token Behavior Deposits & Refunds Deposit Addresses