Reference
Rate limits
Limits exist where an operation costs real money or touches a real phone. All limits return 429 with a Retry-After header.
| Scope | Limit |
|---|---|
| v1 API requests | 100/minute per API key |
| Outbound calls | 5 concurrent · 50/hour per account |
| Quickstart agent creation | 10/hour per account |
Test calls (test-call) | 5/day per account |
| Number purchases | 5/hour per account |
| Voice previews | 40/minute per account |
| Event streams (SSE) | 6 concurrent per account |
| Signup | 10/hour per IP |
Design notes
- Session (dashboard) traffic isn't counted against the per-key API limit.
- Webhook deliveries time out after 4 seconds — respond
2xxfast and process async. - Current usage and the published limits are available programmatically:
GET /api/v1/usage?days=30.
If a limit blocks a legitimate workload, see Support.