generated: '2026-07-21'
method: searched
source: https://tc.docs.syndicate.io/infrastructure/transaction-broadcasting
authentication:
  style: http-bearer
  header: 'Authorization: Bearer <api-key>'
  note: API keys are scoped to a project; environment-wide keys can create projects.
  ref: authentication/syndicate-authentication.yml
idempotency:
  supported: true
  mechanism: client-supplied UUID
  fields:
  - name: requestId
    scope: transactions (POST /transact/sendTransaction)
    optional: true
    behavior: >-
      If provided (valid UUID) it is saved and returned; a duplicate returns
      HTTP 409. If omitted, Syndicate generates one and returns it.
  - name: signatureId
    scope: signatures (personalSign / signTypedData / signTypedDataWithLookup)
    optional: true
    behavior: same as requestId, for signing operations
  guarantee: >-
    Syndicate advertises "guaranteed idempotency" — a valid transaction is
    delivered on-chain exactly once regardless of retries, re-orgs, or dropped
    transactions.
pagination:
  style: unknown
  note: >-
    Collection endpoints (get-transaction-requests-by-project,
    get-transactions-by-project, get-project-signatures) exist; the OpenAPI does
    not declare explicit cursor/offset pagination parameters.
error_envelope:
  shape: 'ErrorBody { message: string }'
  content_type: application/json
  format: non-rfc9457
  ref: errors/syndicate-problem-types.yml
request_tracing:
  note: requestId doubles as the client-side correlation id for a transaction.
versioning:
  ref: lifecycle/syndicate-lifecycle.yml
  scheme: none-visible
rate_limiting:
  note: >-
    Throughput up to ~5,000 RPS on enterprise tiers; no documented per-key
    rate-limit response headers found.
ip_allowlisting:
  supported: true
  note: >-
    Projects can restrict API access to allowed IP ranges via /admin/allowedIP
    (403 when caller IP is outside the range).
webhooks:
  ref: asyncapi/syndicate-webhooks.yml
  signing: Syndicate-Signature HMAC-SHA256 with timestamp (replay protection)