CodePostalPro for ChatGPT

com.codepostalpro/postal-codes

Postal lookups for 120 countries with cited sources; deep US tier: demographics, climate, area codes

client:ChatGPT transport:streamable-http tools:7

Install CodePostalPro in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://api.codepostalpro.com/mcp

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