Rate Limits & Quotas
How CallMissed limits request rate — per-key RPM, budget caps, response headers, and how to handle 429s.
Limit Layers
Requests pass through several limits, in order:
| Layer | Limit | Scope |
|---|---|---|
| Per-key RPM | plan defaults: Free 60 · Starter 500 · Pro 3,000 · Enterprise 10,000 (override per key) | per API key |
| Monthly budget | configurable credit cap | per tenant / per key |
| Plan limits | tier-based caps on LLM/STT/TTS calls, conversations, storage, team size | per tenant |
Abuse protection also runs in front of the API and may throttle traffic that looks automated or hostile, independently of your plan's per-key RPM.
Set a per-key RPM and a budget cap when issuing keys, then track live consumption for each key from the dashboard.
Response Headers
Rate-limited responses include standard headers so you can pace requests:
| Header | Meaning |
|---|---|
Retry-After | Seconds to wait before retrying (on 429) |
X-RateLimit-Limit | The ceiling for the current window |
X-RateLimit-Remaining | Requests left in the window |
Handling 429
When you receive 429 Too Many Requests:
- Read
Retry-Afterand wait at least that long. - Use exponential backoff with jitter for repeated 429s.
- Spread bursty workloads across time, or request a higher per-key RPM.
See Error Codes for the full status/code reference.