crosscheck for ChatGPT

com.crosscheckapi/crosscheck

Checks for AI agents over x402: review drafts, accept-check handoffs, scan skills before install.

client:ChatGPT transport:streamable-http runtime:npm tools:5

Install crosscheck in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://crosscheckapi.com/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs