Bellwether
Live Kalshi + Polymarket prediction-market data and cross-venue arbitrage spreads, one schema.
Connect it
Settings → Connectors → Add custom connector
URL: https://api.bellwether.markets/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://api.bellwether.markets/mcp{
"mcpServers": {
"prediction-markets": {
"url": "https://api.bellwether.markets/mcp",
"headers": {
"X-API-Key": "<YOUR_X_API_KEY>"
}
}
}
}claude mcp add --transport http prediction-markets https://api.bellwether.markets/mcp --header "X-API-Key: <value>"{
"servers": {
"prediction-markets": {
"type": "http",
"url": "https://api.bellwether.markets/mcp",
"headers": {
"X-API-Key": "<YOUR_X_API_KEY>"
}
}
}
}3 tools, verified live
list_marketsList open prediction markets across Kalshi and Polymarket (normalized).
get_marketGet one normalized market. venue is 'kalshi' or 'polymarket'.
matching_marketsFind the same real-world event on both venues, with the YES price spread.
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