Sinch Verification API · Rate Limits

Sinch Verify Rate Limits

Sinch does not publish a single fixed numeric request-rate limit for the Verification API in its public documentation. In practice, throughput and abuse controls are governed at the application/account level and by per-number velocity limits designed to prevent verification fraud and pumping - for example, capping how frequently the same phone number can be re-verified within a time window. Some of these safeguards are configurable in the Sinch Build dashboard (velocity rules, allowed methods, country rules). Numeric per-endpoint limits are not documented as of the review date.

Sinch Verify Rate Limits is the machine-readable rate-limit profile for Sinch Verification API on the APIs.io network, conforming to the API Commons Rate Limits specification.

It captures 3 rate-limit definitions, measuring requests and verifications.

The profile also includes 2 backoff/retry policies defined and response codes documented for throttled.

Tagged areas include Number Verification, OTP, 2FA, Rate Limiting, and Quotas.

3 Limits Throttle: 429
Number VerificationOTP2FARate LimitingQuotas

Limits

Verification API Requests application
requests
not published
No fixed numeric per-second request-rate limit is documented publicly.
Per-Number Velocity number
verifications
configurable
Anti-fraud velocity limits cap how often the same number can be verified within a window; configurable via dashboard rules.
Method / Country Rules account
verifications
configurable
Allowed methods and destination countries can be restricted per application to control spend and abuse.

Policies

Anti-Fraud Controls
Velocity limits and rules mitigate verification pumping and SMS fraud; tune them in the Build dashboard.
Backoff Strategy
Clients should implement exponential backoff with jitter and honor Retry-After on 429 responses.

Sources