Prediction Market Signal MCP server

prediction-market-signal-mcp

Live Polymarket + Kalshi prediction-market odds, movers, price history, cross-platform gaps, watch, and X/Twitter sentiment inside Claude, Cursor, or any MCP client — no API key, no subscription, no monthly minimum. Your agent pays a fraction of a cent per call in USDC on Base using x402.

pm_search          $0.01/call    markets matching a question, Polymarket + Kalshi, ranked
pm_odds            $0.02/call    headline per platform, cross-platform gap, 7-day history, summary
pm_movers          $0.02/call    biggest probability swings (Polymarket, liquid markets)
pm_history         $0.02/call    one market's probability series, with first/last/high/low
pm_ticker_events   $0.01/call    open markets mentioning a US stock ticker or company
pm_sentiment       $0.05/call    markets AND X/Twitter chatter on the same question, one call
pm_watch           $0.02/call    only what moved since your last check (stateless cursor)
pm_gaps            $0.02/call    biggest Polymarket-vs-Kalshi disagreements, same question
pm_closing         $0.01/call    markets settling soon, both platforms
pm_resolved        $0.01/call    markets that just settled, with the outcome
pm_example         free          a real capped pm_odds result, no wallet needed

Facts only — not investment advice. Every answer is implied probability, volume, and price history from the markets themselves (plus, for pm_sentiment, a plain read of what X/Twitter is saying). Nothing here is a buy/sell/hold signal, a trade recommendation, or financial advice.

Why this exists

Prediction markets (Polymarket, Kalshi) already price real-world questions — elections, Fed decisions, macro events — as crowd-forecast odds. Reading them across two platforms usually means two different SDKs, two rate limits, and no cross-platform comparison. This server does both in one call, charges per request instead of a subscription, and there is nothing to cancel.

Tools

pm_search — $0.01

Markets on Polymarket + Kalshi matching a question or topic, ranked by relevance, each with probability, 24h change, volume, close date, URL, and id (use the id with pmhistory or pmwatch). Inputs: q (required), limit (optional, 1-50, default 20).

pm_odds — $0.02

"What do the markets say" for one question — the headline market per platform, the cross-platform probability gap, 7-day history, and a one-line summary:

{
  "headline": { "polymarket": {...}, "kalshi": {...}, "gap_pts": 4 },
  "history_7d": { "points": [...] },
  "summary": "..."
}

Input: q (required). Use pm_search instead when you want the full ranked list.

pm_movers — $0.02

Biggest 24h/7d probability swings among liquid Polymarket markets — what's newly hot. Inputs: window (optional, 24h default or 7d), limit (optional, 1-50, default 20).

pm_history — $0.02

One market's probability series over time, first/last/high/low. Inputs: id (required — a Polymarket condition id/slug/numeric id, or a Kalshi ticker, from pm_search), interval (optional, 1d/1w/1m/max, default 1w).

pmtickerevents — $0.01

Open Polymarket + Kalshi markets mentioning a US stock ticker or company (a bare ticker like TSLA is also matched against the company name, Tesla). Facts only — implied probability, 24h change, volume — never a trade signal. Inputs: q (required — ticker or company/topic), limit (optional, 1-50, default 20).

pm_sentiment — $0.05

What the markets say AND what X/Twitter is saying about the SAME question, one call: headline market probability, an AI read of X chatter's yes/no lean, key themes, driving accounts, notable post URLs, and an aligned / diverges / noclearread verdict comparing the two:

Shortened. The full README is on GitHub.