Base Tx Preflight for ChatGPT

com.madebydevx.preflight/preflight

Simulate a Base tx before signing: revert reason, gas limit, full fee in ETH/USD. Paid x402.

client:ChatGPT transport:streamable-http tools:2

Install Base Tx Preflight in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://preflight.madebydevx.com/mcp

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