# Docs by LangChain: LangSmith REST API

> Markdown index of the LangSmith REST API documentation.

## LangSmith REST API

- [List gateway policies](https://docs.langchain.com/langsmith/smith-api/gateway-policies/list-gateway-policies.md)
- [Create a gateway policy](https://docs.langchain.com/langsmith/smith-api/gateway-policies/create-a-gateway-policy.md)
- [Search gateway policies by subject value set](https://docs.langchain.com/langsmith/smith-api/gateway-policies/search-gateway-policies-by-subject-value-set.md)
- [Get a gateway policy](https://docs.langchain.com/langsmith/smith-api/gateway-policies/get-a-gateway-policy.md)
- [Delete a gateway policy](https://docs.langchain.com/langsmith/smith-api/gateway-policies/delete-a-gateway-policy.md)
- [Update a gateway policy](https://docs.langchain.com/langsmith/smith-api/gateway-policies/update-a-gateway-policy.md)