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Premium includes 10,000 API requests per UTC calendar month. The allowance window starts at 00:00:00Z on the first day of the month and resets at 00:00:00Z on the first day of the next month, independently of whether Premium was purchased weekly, monthly, or through a one-time payment. Call GET /v1/usage for the authenticated account’s current allowance window. The usage endpoint itself does not consume monthly allowance.
The response reports the period start and reset time, monthly allowance, used and remaining requests, and any remaining additional-request allowance.

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Accounting rules

  • Completed authenticated public operations are charged according to the OpenAPI contract.
  • A 304 is charged because the service authenticated and checked the resource.
  • An exact successful create-email idempotency replay is not charged again.
  • GET /v1/usage is not charged.
  • 401, 403, 429, and service 5xx responses are not charged.
  • Authenticated processed 400, 404, 409, and 422 responses are charged.
  • Inbound SMTP admission is independent from public API usage.
RateLimit-Limit, RateLimit-Remaining, and RateLimit-Reset mirror the authoritative request allowance on applicable responses. A renewal within the same UTC month does not reset usage. Dashboard entitlement and the live API response remain authoritative for the current window and any separately purchased request pack.
Last modified on August 8, 2026