generated: '2026-07-17'
method: searched
source: https://docs.across.to/introduction/api-keys
provider: Across
api: Across Swap API
docs: https://docs.across.to/introduction/api-keys
summary: >-
  Production use of the Across Swap API requires two credentials: an API key
  passed as a Bearer token in the Authorization header, and a 2-byte hex
  integratorId. Testnet requires no credentials.
schemes:
- type: http
  scheme: bearer
  name: Authorization
  in: header
  required_for: production
  format: 'Authorization: Bearer [example key]'
  description: API key issued per integrator; sent on every API call.
- type: apiKey
  name: integratorId
  in: query
  required_for: production
  format: 2-byte hex identifier (e.g. 0xdead, 0x0001, 0xffff)
  description: >-
    Unique integrator identifier. Passed as the integratorId query parameter on
    Swap API calls; for direct contract integration it is appended to calldata
    prefixed with the delimiter 1dc0de (without the 0x prefix).
notes:
- Testnet does not require an API key or integrator ID.
- Requests without valid credentials are subject to strict rate limits; authenticated requests receive higher allowances.
- Exceeding limits returns HTTP 429 Too Many Requests.
credentials_request: https://docs.across.to/introduction/api-keys