groundhog.markets for ChatGPT
markets.groundhog/weather
groundhog.markets: free weather forecasts in one call, plus Kalshi and Polymarket market rules.
client:ChatGPT
transport:streamable-http
tools:9
Install groundhog.markets in ChatGPT
Settings → Connectors → Advanced → Developer mode
https://groundhog.markets/mcpCustom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs