Bellwether

Created By

16 days ago

Unified prediction-market data API + remote MCP server. Normalizes Kalshi and Polymarket into one schema and surfaces the same real-world event priced on both venues, with the spread between them (cross-venue arbitrage signal). Three tools: list_markets, get_market, matching_markets. Remote streamable-HTTP — no install: claude mcp add --transport http bellwether https://api.bellwether.markets/mcp. Free tier 120 req/hr, no signup.

# prediction-markets

# kalshi

Overview Content Tools Comments

Overview

Bellwether

One API for every prediction market. Kalshi + Polymarket, normalized into a single schema, with a cross-venue matching-markets endpoint that finds the same real-world event priced on both venues and the spread between them.

Tools

list_markets — open markets across both venues, normalized (prices as probabilities, UTC times)
- get_market — one market's full detail
- matching_markets — same event on both venues + the YES-price spread (the arbitrage signal)
Use it (no install)
claude mcp add --transport http bellwether https://api.bellwether.markets/mcp
Also a REST API: curl https://api.bellwether.markets/matching-markets. Free tier 120 req/hr, no signup. Docs: https://api.bellwether.markets/docs

Try in Playground

Server Config

{
  "mcpServers": {
    "bellwether": {
      "type": "streamable-http",
      "url": "https://api.bellwether.markets/mcp"
    }
  }
}

Project Info

Created At

16 days ago

Updated At

16 days ago

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Bellwether

Bellwether

Tools

Use it (no install)

Server Config

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