Brex REST API

REST discovered

Details

URL: https://api.brex.com
Docs: https://developer.brex.com/

Authentication

Brex user/API token bearer discovered Get token ↗

Authorization: Bearer <credential>

Sign in to the Brex Dashboard as an account admin or card admin, open Settings → Developer, accept the developer API agreement if prompted, then click Create Token. Name the token, choose the scopes you need, confirm with Allow Access, and copy the token immediately because Brex only shows it once. This same token can also be used as an API key for the MCP server.

OAuth 2.0 oauth2 discovered

OAuth 2.0 — self-onboarding

Point your MCP client at the server URL and approve access in the browser. The server supports OAuth Dynamic Client Registration (RFC 7591), so the client registers itself automatically — no developer-portal app, client_id, or client_secret to create.