PromNET — Hungarian business calculators & legal checker for ChatGPT

hu.promnet/promnet

Hungarian VAT, payroll, KATA/flat-rate tax, late interest, workdays and website legal checks.

client:ChatGPT transport:streamable-http tools:8

Install PromNET — Hungarian business calculators & legal checker in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://promnet.hu/mcp

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