Skip to content

Bellwether

by bellwether.markets · remote · no sign-in to list tools · v0.1.0 · published by markets.bellwether

Live Kalshi + Polymarket prediction-market data and cross-venue arbitrage spreads, one schema.

Read only
CompareRegistry entry

3 tools: 3 only read.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http prediction-markets https://api.bellwether.markets/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

3 tools

Only reads 3Claude Code: allow
  • get_marketGet one normalized market.No findings

    Why it is in this group

    • The name "get_market" says "get": a word for reading.
    Description, as the server wrote it
    Get one normalized market. venue is 'kalshi' or 'polymarket'.
  • list_marketsList open prediction markets across Kalshi and Polymarket (normalized).No findings

    Why it is in this group

    • The name "list_markets" says "list": a word for reading.
    Description, as the server wrote it
    List open prediction markets across Kalshi and Polymarket (normalized).
  • matching_marketsFind the same real-world event on both venues, with the YES price spread.No findings

    Why it is in this group

    • The description's first verb is "find": a word for reading.
    Description, as the server wrote it
    Find the same real-world event on both venues, with the YES price spread.

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 0.1.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http prediction-markets https://api.bellwether.markets/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__prediction-markets__list_markets",
      "mcp__prediction-markets__get_market",
      "mcp__prediction-markets__matching_markets"
    ],
    "ask": [],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as prediction-markets. Review it before you use it.