Connect Underpriced AI to Claude, ChatGPT and coding assistants

Underpriced AI runs as an MCP server, the open standard AI assistants use to call outside tools. Add it once and your assistant can tell you what an item sells for on eBay, show the real sales behind the number, say whether a find is worth buying at the price in front of you, and, once you sign in, run photo scans on your own account and prepare eBay listings for you to review.

The server URL for every client is https://underpricedai.com/api/mcp. The connector page at https://underpricedai.com/mcp has copy buttons, prompts to try, and one-click installs for Cursor and VS Code.

Claude (web and desktop)

Open Settings, then Connectors, then Add custom connector. Name it Underpriced AI, paste the server URL and leave the authentication fields empty. Claude offers the sign-in the first time a tool needs your account. Free accounts can add one custom connector; on Team and Enterprise an owner adds it for the organization.

Claude Code

Run this in your terminal, then restart Claude Code so it loads the new server:

claude mcp add --transport http underpriced https://underpricedai.com/api/mcp

Type /mcp to see the tools and choose Authenticate to sign in. If Claude Code runs inside WSL, a container or a remote machine, click Allow on the sign-in page, then copy the link it shows and open it from inside that environment while the dialog is still open.

ChatGPT

Custom connectors need a Plus or Pro plan with Developer Mode switched on under Settings, Apps and connectors, Advanced. Business and Enterprise workspaces need an admin to allow them. Then open Settings, Connectors, Create, paste the server URL and choose OAuth. ChatGPT Free cannot add custom connectors.

Cursor, VS Code and other clients

Use the Add to Cursor or Add to VS Code button on the connector page, or add the URL by hand as an HTTP server named underpriced. Clients that only speak stdio can use npx mcp-remote with the server URL.

What the tools do

price_item takes a photo link or a description and returns an estimate with a range, the sold comps, three list prices with the two-week sell chance, the net after eBay fees and a worth-it verdict when you give your cost. get_sold_comps returns recent real eBay US sales for a search. worth_it is the fee and verdict arithmetic on its own. Signed in, get_scan_result reads a saved scan once its comps have landed, and list_on_ebay prepares the listing draft and hands you the link to review and publish in the app. The assistant never publishes or buys anything on its own.

Limits and disconnecting

Without signing in, use is capped per day. Signed in, a photo price is a real scan on your account and uses your credits or plan. To revoke an assistant, open Settings in the app and choose Disconnect AI assistants; your web and app sign-ins are not affected.