Where is the biggest price gap between Kalshi and Polymarket on tonight’s games?
What you get back: The largest cross-venue gap on NBA, NHL and MLB contracts in percentage points, the cheaper venue and a WATCH or ARB signal.
A Polymarket MCP server that compares it with Kalshi
Quick Answer
to put Polymarket prices in front of an AI agent, add https://predictionmarketspicks.com/api/mcp/mcp?via=site-polymarket as a remote MCP server in Claude, ChatGPT, Gemini, Cursor or Grok. No API key. The cross-venue gap scanner (NBA, NHL and MLB games), the Fed next-meeting check and the Pro mispricing scan all read Polymarket’s international order book beside Kalshi.
MCP server URL — add it to any AI host
https://predictionmarketspicks.com/api/mcp/mcp?via=site-polymarketConnect it
- Pick your AI host: Claude, ChatGPT, Gemini, Cursor, VS Code or Grok all take a remote MCP server URL.
- Add https://predictionmarketspicks.com/api/mcp/mcp?via=site-polymarket with no authentication. The host-by-host steps are on the setup page.
- Ask a cross-venue question — “Kalshi or Polymarket?” is the phrase that makes the agent reach for these tools.
Every Polymarket price these tools return comes from Polymarket’s international order book, and the answer says so. Polymarket US is a separate CFTC-regulated venue with its own prices, which can differ.
Transcript
A trader asks their AI app: "Where is the biggest price gap between Kalshi and Polymarket on tonight's games?" The PredictionMarketsPicks connector runs find_arbitrage and answers with the widest cross-venue gap, the cheaper venue and a CHECK signal, labelling Polymarket's international book and noting that Polymarket US is a separate exchange with its own order book. The follow-up, "Do Kalshi and Polymarket agree on the next Fed meeting?", runs fed_rate_odds and returns Kalshi, Polymarket and CME futures side by side for each outcome at the next FOMC meeting, plus the current target range. One URL, no API key. Works in Claude, ChatGPT, Gemini and Cursor.
Prompts that use the Polymarket tools
Copy one into a new chat and swap in your own team, player or market.
Do Kalshi and Polymarket agree on the next Fed meeting?
What you get back: Kalshi’s full strike breakdown for the next FOMC meeting, checked against Polymarket and CME futures, with the gap in points.
Which Polymarket contracts look mispriced against your model right now?
What you get back: Pro: each Polymarket market where the model disagrees with the price, the side, the edge and a quarter-Kelly size. Without Pro you get the count and one preview row.
A Polymarket contract is 33¢ and I make it 40%. Is that worth a position?
What you get back: The edge of a 33¢ Polymarket price against your 40% in percent, with a BUY, SELL or SKIP read. Same math works on a Kalshi price.
Convert Polymarket’s 62¢ to American odds.
What you get back: The same price as American and decimal odds, so you can line it up against odds quoted anywhere else.
Polymarket and AI agents — frequently asked
Which Polymarket order book do these tools read?
Polymarket’s international book — the one its public Gamma API serves. Polymarket US is a separate CFTC-regulated exchange with its own prices. Every answer that quotes Polymarket labels the venue, because the two can disagree.
Why compare Polymarket with Kalshi instead of reading Polymarket alone?
A single venue’s price tells you what one crowd thinks. The gap between two venues on the same contract is where the information is — it shows a stale price, a liquidity hole or a genuine disagreement, and it is what the arbitrage and Fed tools measure.
Can the agent trade on Polymarket through this server?
No. The tools are read-only: prices, gaps and calculations. Any position is placed on the venue itself, with your own account.
What does the free tier include?
37 of the 44 tools need no key, including the cross-venue gap scanner (the top 3 gaps in full) and the Fed odds. Pro returns the whole gap board and adds the Polymarket mispricing scan.
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