Rate limits
None today. The product is unlimited SMS + voice for the subscription year. We don't impose per-token, per-number, or per-IP throttles at the API layer.
What you might still hit
- Carrier-level limits — the upstream wireless carrier may rate-limit very high outbound SMS volumes, like any consumer line. Not a contract from us; a fact of cellular.
- Single-active-call constraint on voice — one number, one live call. /voice/dial returns
409if the number is already on a call. - Compute capacity — sustained pathological load (e.g. thousands of concurrent presence WS connections per number) can degrade. We don't pre-throttle; we'll talk if it happens.
What we don't do
- No
X-RateLimit-*headers. - No
429responses on normal traffic. - No tiered pricing. One subscription = unlimited use.
Why
Agent Number is sold as carrier-grade SMS + voice for AI agents. Rate-limiting an agent's API would defeat the use case (OTP catchers, voice agents at scale). The price reflects unlimited use; we plan capacity to it.