Skip to main content
Send your key in the Authorization header:
Credentials in query parameters are rejected. Production and staging prefixes are distinct, and a key is valid only in the environment where it was created. Each key has explicit scopes:
  • domains:read
  • emails:read
  • emails:write
  • messages:read
  • usage:read
An invalid key returns 401. A valid key without the required scope returns 403. Neither response consumes monthly allowance. You may keep up to five active keys. Give each key a purpose-specific name, grant only necessary scopes, rotate suspected credentials immediately, and revoke keys that are no longer used. Raw keys are shown only on creation or rotation.
Last modified on August 1, 2026