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API Reference

Complete API reference for the Across Protocol.

The Across API provides programmatic access to crosschain bridging and swap functionality. Use these endpoints to get quotes, check limits, query deposit status, and more.

Server URLs

EnvironmentBase URL
Productionhttps://app.across.to/api

Authentication

All API requests require a Bearer token passed via the Authorization header.

To get your API key and Integrator ID, reach out to us on Telegram.

Endpoints

Browse the individual endpoint pages in the sidebar for full parameter details, response schemas, and code samples.

Get swap approval data GET

Returns data required to execute a crosschain swap. If the input token requires approval, `approvalTxns` will be included in the response.

On this page

Server URLsAuthenticationEndpoints