generated: '2026-07-17'
method: searched
source: https://docs.across.to/api-reference ; https://docs.across.to/introduction/api-keys ; https://docs.across.to/introduction/tracking-deposits
provider: Across
api: Across Swap API
base_url: https://app.across.to/api
conventions:
  auth:
    style: bearer-token-plus-integrator-id
    header: 'Authorization: Bearer <API_KEY>'
    integrator_id: integratorId query parameter (2-byte hex)
    testnet: no credentials required
    ref: authentication/across-authentication.yml
  transport:
    protocol: https
    formats:
    - application/json
  rate_limiting:
    signaled_by: HTTP 429 Too Many Requests
    policy: unauthenticated requests strictly limited; authenticated keys receive higher allowances
  versioning:
    style: path-and-endpoint
    notes: >-
      Suggested-fees / available-routes / limits are documented as the legacy
      surface; the unified Swap API (/swap/*) is the current entry point.
  idempotency:
    supported: false
    notes: No idempotency-key mechanism is documented; quote endpoints are read-oriented and deposits are settled on-chain by transaction hash.
  pagination:
    documented: false
    notes: The deposits listing (GET /deposits) is filtered by depositor; no page/cursor parameters are documented.
  tracing:
    request_id: not documented
  error_envelope:
    style: json
    notes: Errors returned as JSON with HTTP status codes; see errors reference in docs. No RFC 9457 problem+json declared.
  endpoints_reference: https://docs.across.to/api-reference