# Rate limits

Rate limits are assigned per account, based on your service plan. They govern
how many requests you can submit over a given time window.

When you exceed your allowed rate, the API responds with
`429 Too Many Requests`. Back off and retry after a short delay; sustained
bursts above your limit will continue to be throttled.

Specific throughput (TPS) values depend on your service plan and are not listed
here. Contact [Support](https://support.smscpr.com) if you need your current
limits or a higher allocation.

## Next steps

- [Error codes](/docs/api/error-codes) — full list of API response codes.
- [SMS](/docs/api/channels/sms) — channel overview.