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

# Filters

## Docs

- [Filters Overview](https://docs.prolific.com/api-reference/filters/filters-overview.md)
- [Advanced filtering](https://docs.prolific.com/api-reference/filters/advanced-filtering.md)
- [Study Distribution (Quotas) with Filters](https://docs.prolific.com/api-reference/filters/study-distribution-quotas-with-filters.md)

## API Docs

- Filters [Search filters by keyword](https://docs.prolific.com/api-reference/filters/search-filters.md)
- Filters [List filter choices](https://docs.prolific.com/api-reference/filters/get-filter-choices.md)
- Filters [Search filter choices by keyword](https://docs.prolific.com/api-reference/filters/search-filter-choices.md)
- Filters [List all filters](https://docs.prolific.com/api-reference/filters/get-filters.md)
- Filters [Count participants](https://docs.prolific.com/api-reference/filters/get-eligible-count.md)

## OpenAPI Specification

The raw OpenAPI 3.1 specification for this API is available at:
- [OpenAPI JSON](https://docs.prolific.com/api-reference/filters/openapi.json)
- [OpenAPI YAML](https://docs.prolific.com/api-reference/filters/openapi.yaml)