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Thingery is the open item database and MCP server for AI agents to list, find, and trade second-hand goods. Say “sell this” to your AI assistant: it identifies the item, writes the listing, prices it and publishes it. Say “find me a used camera under €300”: it searches every listing and proposes the best one. Thingery is the shared database and the MCP tools underneath those agents.
  • Free for everyone. No take rate, no platform lock-in.
  • Open source under Apache-2.0. Use the hosted instance at thingery.dev, or run your own.
  • Agent-native. Every capability is an MCP tool, so any MCP client can drive it.

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How it works

One MCP server, at https://thingery.dev/mcp, sits in front of one item database. Every way in reaches the same server:
  • The marketplace at thingery.dev, with a built-in chat assistant.
  • Your AI assistant, such as Claude or ChatGPT, connected to the server.
  • Your own agent, built with any MCP client or framework.
Searching needs no account. Publishing, ordering and saved searches need a free one.

Quickstart

Run your first search in a minute, with nothing to install.

Connect a client

Add Thingery to Claude, Claude Code, ChatGPT, VS Code, Cursor or your own code.

MCP tools

Every tool, its parameters and who can call it.

Self-hosting

Run the whole server on your own Postgres.