Connect Gemini to Kalshi and Polymarket

Quick Answer

to give Gemini live Kalshi and Polymarket prices, run gemini extensions install https://github.com/predictionmarketspicks/mcp in Gemini CLI — the extension connects to https://predictionmarketspicks.com/api/mcp/mcp. No API key: 22 of the 33 PredictionMarketsPicks tools answer right away.

MCP server URL — the extension points here

https://predictionmarketspicks.com/api/mcp/mcp

Set it up in Gemini CLI

Install Gemini CLI if you have not already, and sign in once.
Run the command below. Gemini asks you to confirm the install; it adds the PredictionMarketsPicks extension and its server.
Run gemini mcp list — predictionmarketspicks should read Connected. Then start Gemini and ask about a market.

Gemini CLI

gemini extensions install https://github.com/predictionmarketspicks/mcp

In the Gemini web app, Google lists a custom-app path for personal accounts in the US with Keep Activity on: Settings → Connected Apps → Add a custom app, then paste https://predictionmarketspicks.com/api/mcp/mcp. That path is from Google’s help article; we have not click-tested it yet.

Five prompts to try in Gemini

Copy one into a new chat and swap in your own team, player or market.

Which receivers have the biggest gap between Kalshi and the other venues on yardage props this week?

What you get back: Receiving-yards props with each venue’s price side by side and the cheapest place to buy.

Who wins Chiefs vs Chargers by the power ratings, and what is the projected score?

What you get back: Each side’s win probability from our power ratings, plus the projected score and cover odds.

Show Kalshi’s perpetual futures for Bitcoin and gold.

What you get back: Each perpetual’s price, 24-hour volume, open interest, maximum leverage and what funding has cost a long.

Convert +240 to an implied probability.

What you get back: The implied probability — the Kalshi price in cents that matches it — plus decimal odds.

My prior is 30%. A new poll is twice as likely if the candidate wins than if they lose. Update it.

What you get back: The posterior probability and each step of the update.

Gemini and prediction markets — frequently asked

What does the Gemini CLI extension install?

A small manifest and a context file from github.com/predictionmarketspicks/mcp. The extension itself runs no code on your machine — it points Gemini CLI at our hosted MCP server, which does the work and returns market data.

How do I update or remove the extension?

gemini extensions update predictionmarketspicks pulls the latest release; gemini extensions uninstall predictionmarketspicks removes it. Neither touches any other extension or setting.

Can Gemini see Kalshi prices without the extension?

Not live ones. Gemini can search the web, but a search result is a page snapshot, not the order book. The extension lets Gemini ask our tools for the price at the moment you ask.

Is the Gemini extension free?

Yes — 22 of the 33 tools need no account or key. A Pro membership adds the model’s edge calls and live mispricing scans.

Using ChatGPT, Claude, Cursor or Grok? Same URL — setup for every host → · what every tool returns →