> For the complete documentation index, see [llms.txt](https://docs.placekey.io/documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.placekey.io/documentation/api-overview.md).

# API Overview

- [Authentication](https://docs.placekey.io/documentation/api-overview/authentication.md)
- [Usage Limits](https://docs.placekey.io/documentation/api-overview/usage-limits.md)
- [Error Codes](https://docs.placekey.io/documentation/api-overview/error-codes.md)
- [Supported Countries](https://docs.placekey.io/documentation/api-overview/supported-countries.md)