Vatstack MCP by usefulapi for ChatGPT

io.usefulapi/vatstack

Validate VAT numbers, look up VAT rates and review past checks and plan hits in Vatstack.

client:ChatGPT transport:streamable-http tools:6

Install Vatstack MCP by usefulapi in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://vatstack.usefulapi.io/mcp

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