MCP connector · Auction price data

Add auction price data to Gemini

Bring realized auction prices into Gemini. Add the ALT/FNDATA connector as a custom app for your personal account, or have an admin add it across Gemini Enterprise.

Get your API key Setup steps

The personal-account steps use the Gemini app at gemini.google.com. For an organisation, see the Gemini Enterprise admin set-up below.

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 Gemini in four steps

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

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
Open Connected Apps
In the Gemini app at gemini.google.com, open Settings → Connected Apps and choose Add a custom app (personal Google accounts).
3
Add the hosted connector
Enter the connector URL https://mcp.altfndata.com/mcp and choose OAuth.
4
Sign in and confirm
Sign in with your ALT/FNDATA API key, then ask Gemini an auction-price question.

For organisations

Gemini Enterprise (admin set-up)

Gemini Enterprise connects through a Custom MCP Server data store, which an admin sets up once for the whole organisation. Each user then signs in with their own ALT/FNDATA API key.

Register a client

curl -X POST https://mcp.altfndata.com/register \
  -H "Content-Type: application/json" \
  -d '{"client_name": "Gemini Enterprise (your organisation)",
       "redirect_uris": ["https://vertexaisearch.cloud.google.com/oauth-redirect"],
       "token_endpoint_auth_method": "client_secret_post",
       "grant_types": ["authorization_code", "refresh_token"],
       "response_types": ["code"],
       "scope": "read"}'

Add a Custom MCP Server data store

In the Gemini Enterprise console, add a Custom MCP Server data store with these values:

MCP Server URL	`https://mcp.altfndata.com/mcp`
Authorization URL	`https://mcp.altfndata.com/authorize`
Token URL	`https://mcp.altfndata.com/token`
Client ID	`client_id` from step 1
Client Secret	`client_secret` from step 1
Scopes	`read`
Enable PKCE	ticked

3
Each user signs in

Each user then connects from Gemini and signs in with their own ALT/FNDATA API key. The client ID and secret only identify your organisation's Gemini Enterprise; they give no access to data on their own.

Google's guide to setting up a custom MCP server describes the console screens.

Try it

Ask in plain language

Once connected, ask Gemini 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

How do we set this up for a whole organisation in Gemini Enterprise?

An admin adds ALT/FNDATA once as a Custom MCP Server data store. See the Gemini Enterprise admin set-up section on this page for the registration call and the exact console fields.

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 Gemini

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

Get your API key Read the docs

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Add auction price data to Gemini

Connect Gemini in four steps

Get your ALT/FNDATA API key

Open Connected Apps

Add the hosted connector

Sign in and confirm