# Docs by LangChain: LangSmith REST API

> Markdown index of the LangSmith REST API documentation.

## LangSmith REST API

- [List usage limits](https://docs.langchain.com/langsmith/smith-api/usage-limits/list-usage-limits.md)
- [Upsert usage limit](https://docs.langchain.com/langsmith/smith-api/usage-limits/upsert-usage-limit.md)
- [List org usage limits](https://docs.langchain.com/langsmith/smith-api/usage-limits/list-org-usage-limits.md)
- [Delete usage limit](https://docs.langchain.com/langsmith/smith-api/usage-limits/delete-usage-limit.md)