MCP server

Bellwether Official

markets.bellwether/prediction-markets

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

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

Working at last checkVerified publisher: bellwether.marketsAbout 275 tokens per request once connected3 tools

https://api.bellwether.markets/mcp

At a glance

Type: MCP server
Publisher: bellwether.markets (verified by the MCP Registry)
Status: Working at last check
Tools: 3
Token cost: About 275 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 26 Oct 2026, 08:29 UTC

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.prediction-markets]
url = "https://api.bellwether.markets/mcp"

Gemini CLI

{"mcpServers":{"prediction-markets":{"httpUrl":"https://api.bellwether.markets/mcp"}}}

Cursor

{"mcpServers":{"prediction-markets":{"url":"https://api.bellwether.markets/mcp"}}}

VS Code

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

Antigravity

agy mcp add prediction-markets https://api.bellwether.markets/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"prediction-markets","server_url":"https://api.bellwether.markets/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"prediction-markets","server_url":"https://api.bellwether.markets/mcp"}

get_market ~87 tokens
Get one normalized market. venue is 'kalshi' or 'polymarket'.
list_markets ~95 tokens
List open prediction markets across Kalshi and Polymarket (normalized).
matching_markets ~93 tokens
Find the same real-world event on both venues, with the YES price spread.

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