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MCP connector · Auction price data

Add auction price data to your AI assistant

Connect Claude, ChatGPT, Gemini, Perplexity or Mistral Le Chat to realized auction prices across 20 collectible categories. Add the connector once, then ask in plain language.

Get your API keyChoose your assistant

The connector is hosted, so there is nothing to install. Pick your assistant below for exact steps.

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 guides

Choose your assistant

Each guide has the exact menu path, the connector URL and the OAuth sign-in for that assistant.

ClaudeSettings → ConnectorsSet up →ChatGPTCustom connector, developer modeSet up →GeminiConnected Apps, or EnterpriseSet up →PerplexitySettings → ConnectorsSet up →Mistral Le ChatConnectors → Add ConnectorSet up →Developer toolsClaude Code, Cursor, ClineSet up →
The short version

Connect in four steps

In any assistant that supports custom connectors, the flow is the same.

  1. 1

    Get your ALT/FNDATA API key

    Open API Key & MCP, go to API Key & MCP, and copy your key.

  2. 2

    Add a custom connector

    In your assistant, add a custom (remote) connector with the URL https://mcp.altfndata.com/mcp.

  3. 3

    Choose OAuth

    When asked how to authenticate, choose OAuth.

  4. 4

    Sign in and confirm

    Sign in with your API key, then ask an auction-price question.

Try it

Ask in plain language

Once connected, ask questions like these. The assistant 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

Which assistants can use the connector?
Claude, ChatGPT, Gemini, Perplexity and Mistral Le Chat, plus developer tools such as Claude Code, Cursor and Cline. Any client that supports MCP servers can connect.
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.

Get your key and connect

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

Get your API keyRead the docs

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