# Which plan has API access?

> Agency.

Source: https://warmerly.com/docs/faq/which-plan-has-api-access

Agency. [Authentication](https://warmerly.com/docs/authentication)

## More from Frequently asked questions

- [How do I make sure someone is never contacted again?](https://warmerly.com/docs/faq/how-do-i-make-sure-someone-is-never-contacted-again): Add them to the suppression list; suppressed addresses are never sent to by any campaign.
- [How do I authenticate?](https://warmerly.com/docs/faq/how-do-i-authenticate): An X-Api-Key header, plus X-Project-Id to say which project you are acting in.
- [Are there rate limits?](https://warmerly.com/docs/faq/are-there-rate-limits): Yes, per endpoint group, and they are separate from your plan's monthly allowances.