Underpriced AI

Resale prices for secondhand items from real eBay sold listings, with comps and a worth-it verdict.

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What it can do

    What data it sees

    Do you need an account

    No: the server works without sign-in

    Resale prices for secondhand items from real eBay sold listings, with comps and a worth-it verdict.

    How to connect

    How to connect Underpriced AI to Claude

    The server address to paste into Claude settings:

    https://underpricedai.com/api/mcp

    1. Open Claude (claude.ai or the desktop app).
    2. Go to Settings → Connectors.
    3. Click Add custom connector.
    4. Paste the server address copied below into Remote MCP server URL and click Add.
    5. In a chat, click + → Connectors and switch the new connector on.

    Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

    Authorization

    After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

    How to connect Underpriced AI to ChatGPT

    The server address to paste into ChatGPT settings:

    https://underpricedai.com/api/mcp

    1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
    2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
    3. Open Settings → Connectors and click Create.
    4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
    5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
    6. In a new chat open + → Apps/Connectors and enable the connector.

    OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

    Authorization

    On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

    How to connect Underpriced AI to Cursor

    The server address to paste into Cursor settings:

    https://underpricedai.com/api/mcp

    Fastest: click Open in Cursor below and confirm the prompt.

    Manually:

    1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
    2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
    3. Save the file. The server appears in the MCP list; authorize it there if asked.

    Authorization

    If the service needs sign-in, an authorize button appears next to the server in the MCP list.

    Server tool list (6)

    Raw names from tools/list. Only developers need these.

    price_itemWhat a secondhand item sells for on eBay US: a calibrated estimate with a range, the recent real sold comps behind it, three list prices (fast, market, patient) with the 14-day sell chance, the net after eBay fees, and a worth-it verdict when you pass what the user would pay. Give image_url (a public https link to a photo) whenever one exists; a description alone works but reads less.
    get_sold_compsThe most recent real eBay US sales for a search query (brand, model or pattern, a few specific words), with the count, median and quartiles. Use when the user wants to see what actually sold and for how much.
    worth_itNet after eBay fees and a verdict (worth it / thin / pass) for an expected sale price and what the user would pay. Pure arithmetic; use price_item first when the sale price is unknown.
    buy_creditsWays to pay for Underpriced AI scans. Without a choice it lists the credit packs (credits never expire), pay as you go ($0.25 per photo scan on a monthly bill, no cap), and for a signed-in user their balance. With a pack it returns a Stripe Checkout link for that user; with PAY_AS_YOU_GO it returns the link that puts a card on file so scans just run from then on. Anonymous callers get the pricing page link.
    get_scan_resultFor a signed-in user: the finished result for a scan on their account, in the same shape as price_item, once the sold comps have landed in the background. Call it with the account.scanId a photo price returned when that result said comps were still loading (about 20 seconds later), or to re-read any saved scan.
    list_on_ebayFor a signed-in user: turns a photo scan from price_item (account.scanId) into an inventory item with a draft eBay listing on their Underpriced AI account (title, list price defaulting to the market price, condition, description) and returns the link where they review and publish it in the app, plus whether eBay is connected and the connect link if not. It never publishes anything; publishing happens in the app after the user checks the listing.