# Within20

> Secondhand product discovery for people and their AI agents. Public beta v0.2.

Search secondhand products across the United States without entering a location. Optionally add any U.S. ZIP or city and state for nearby pickup. Always inspect live source status and preserve fulfillment evidence.

- [Agent instructions](https://within20.lanekingsbery.chatgpt.site/skill.md): Request format, source evidence, attribution, and limits.
- [OpenAPI](https://within20.lanekingsbery.chatgpt.site/openapi.json): Machine-readable request and response schemas.
- [Search API](https://within20.lanekingsbery.chatgpt.site/api/v1/search): POST JSON; browser cookies and Origin are not required by the search handler. Hosting credentials may be required; see agent instructions.
- [Current sources](https://within20.lanekingsbery.chatgpt.site/api/sources): GET JSON; searchable sources.
- [How search works](https://within20.lanekingsbery.chatgpt.site/sources): Human-readable coverage and evidence labels.
- [Privacy](https://within20.lanekingsbery.chatgpt.site/privacy)

Use the same origin as this document for relative API paths. Cite original listing URLs and source names. Keep shipped results separate from pickup. Never interpret unavailable sources or zero matches as proof that an item does not exist. Do not bulk harvest or poll. This is a search API, not a shopping checkout or MCP server.