Across

Across Swap API

The unified REST entry point for all crosschain operations on Across — request swap/bridge quotes and approval data, execute embedded crosschain actions on the destination chain, run gasless flows, enumerate supported chains/tokens/sources, and track deposit lifecycle status. Authentication is a Bearer API key plus a 2-byte hex integratorId query parameter; testnet requires no credentials.

GitHub

Documentation

📖
Documentation
https://docs.across.to
📖
APIReference
https://docs.across.to/api-reference
📖
GettingStarted
https://docs.across.to/introduction
📖
Authentication
https://raw.githubusercontent.com/api-evangelist/across/refs/heads/main/authentication/across-authentication.yml

Other Resources

🔗
Conventions
https://raw.githubusercontent.com/api-evangelist/across/refs/heads/main/conventions/across-conventions.yml
🔗
APIsJSON
https://raw.githubusercontent.com/api-evangelist/across/refs/heads/main/apis.yml

API entry from apis.yml

apis.yml Raw ↑ 
name: Across Swap API
description: The unified REST entry point for all crosschain operations on Across — request swap/bridge
  quotes and approval data, execute embedded crosschain actions on the destination chain, run gasless
  flows, enumerate supported chains/tokens/sources, and track deposit lifecycle status. Authentication
  is a Bearer API key plus a 2-byte hex integratorId query parameter; testnet requires no credentials.
humanURL: https://docs.across.to/introduction/swap-api
baseURL: https://app.across.to/api
tags:
- Cross Chain
- Bridge
- Swap
- Payments
properties:
- type: Documentation
  url: https://docs.across.to
- type: APIReference
  url: https://docs.across.to/api-reference
- type: GettingStarted
  url: https://docs.across.to/introduction
- type: Authentication
  url: authentication/across-authentication.yml
- type: Conventions
  url: conventions/across-conventions.yml