> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.trygrant.com/api-reference/grant-events-api/plan-catalogs/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.trygrant.com/_mcp/server.

# Plan catalogs

> API documentation for Grant — billing infrastructure for usage-based pricing


## API Docs

- [List catalogs attached to a plan](https://docs.trygrant.com/api-reference/grant-events-api/plan-catalogs/list-catalogs.md): Plan catalogs
- [Attach a catalog to a plan](https://docs.trygrant.com/api-reference/grant-events-api/plan-catalogs/attach-catalog.md): Plan catalogs
- [Update catalog pricing on a plan](https://docs.trygrant.com/api-reference/grant-events-api/plan-catalogs/update-catalog.md): Plan catalogs
- [Detach a catalog from a plan](https://docs.trygrant.com/api-reference/grant-events-api/plan-catalogs/detach-catalog.md): Plan catalogs

## OpenAPI Specification

- [OpenAPI JSON](https://docs.trygrant.com/openapi.json): raw OpenAPI 3.1 specification for this API, JSON format
- [OpenAPI YAML](https://docs.trygrant.com/openapi.yaml): raw OpenAPI 3.1 specification for this API, YAML format