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MCP connector · Auction price data

Add auction price data to ChatGPT

Ask ChatGPT what a watch, handbag or painting actually sold for. Add the ALT/FNDATA connector as a custom connector and query the market in conversation.

Get your API keySetup steps

ChatGPT connects only to hosted servers, so use the hosted URL below. ALT/FNDATA is also submitted to the ChatGPT apps directory and under review; until it lists there, add it as a custom connector.

Connector URL
https://mcp.altfndata.com/mcp
Authentication · OAuth
Sign-in · your ALT/FNDATA API key
Access · 9 read-only tools, 20 categories
Get your API key →
Setup

Connect ChatGPT in four steps

You need an ALT/FNDATA API key to sign in. The connector is hosted, so there is nothing to install.

  1. 1

    Get your ALT/FNDATA API key

    Open the app at API Key & MCP, go to API Key & MCP, and copy your key. The connector runs on this key.

  2. 2

    Turn on developer mode

    In ChatGPT, enable developer mode, then choose to add a custom connector.

  3. 3

    Add the hosted connector

    Enter the connector URL https://mcp.altfndata.com/mcp and choose OAuth for authentication.

  4. 4

    Sign in and confirm

    Sign in with your ALT/FNDATA API key, then ask ChatGPT an auction-price question.

Try it

Ask in plain language

Once connected, ask ChatGPT questions like these. It picks the right tool and returns realized prices with sources.

  • What did a Hermès Birkin 30 sell for in 2024?
  • Price-check a Rolex Daytona 116500LN.
  • Market stats for Patek Philippe watches.
  • How have classic Ferrari values moved year by year?
  • Search the whole market for a Burma ruby ring over $50,000.
What you get

Nine read-only tools over 20 categories

Realized auction prices from 100+ auction houses worldwide, normalized to USD. Every result links back to its source. No tool ever writes or changes data.

list_tablesList every category table with live descriptions and column counts.
get_table_schemaSee the column names and types for one category.
query_tableQuery a category with filters, sorting, field selection and pagination.
searchSearch the whole market at once, merged and ranked by realized price.
market_statsCount of sales, median, quartiles, average, min and max for a segment.
price_trendHow realized prices moved over time, bucketed by year, quarter or month.
price_checkA fair-value range for one item from comparable sales, with source links.
market_indexA model-level price index (low to high, sample size, trend) for a brand or model.
list_alertsA read-only view of your price alerts, or guidance on enabling them.
WatchesJewelryLoose gemsHandbagsCarsMotorcyclesAircraftWine & whiskyFine artWorks of artDesignFashionShoesAutomobiliaBooksCoinsOther vehiclesPerfumeAccessoriesMusical instruments

Questions

Frequently asked questions

Is there an official ChatGPT app for ALT/FNDATA?
It is submitted to the ChatGPT apps directory and under review. Until it lists, add the hosted server as a custom connector in developer mode using the steps above.
Do I need a paid plan to use the connector?
Yes. The connector runs on your ALT/FNDATA API key. Get your key in the app at API Key & MCP, choose OAuth when you connect, and sign in with it.
Can the connector change or delete my data?
No. All nine tools are read-only. The connector queries auction data and returns it; it never writes, edits or deletes anything.
What data does it cover?
Realized auction prices across 20 collectible categories, from watches and jewelry to fine art, wine and classic cars, drawn from 100+ auction houses worldwide and normalized to USD.
Are these realized prices or asking prices?
Realized. Every figure is what an item actually sold for at auction, normalized to USD. Unsold lots are tracked separately, and every result links back to its source.
The menu names in my app look different. What do I do?
Assistants rename and move these settings as they roll features out. The connector URL (https://mcp.altfndata.com/mcp) and the OAuth sign-in stay the same; check the assistant's help pages if a step reads differently.
Other assistants

Connect somewhere else

The same connector works across every assistant. Back to the connector hub or read the documentation.

ClaudeGeminiPerplexityMistral Le ChatDeveloper tools

Get your key and connect ChatGPT

Create your API key, add the connector, and start asking ChatGPT what the market actually paid.

Get your API keyRead the docs

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