Hungarian Postcode Validator for ChatGPT

io.github.unbearabledev/hu-postcode-validator

Hungarian postcode lookup + validation - 3,484 codes, sub-10ms lookups, bulk address endpoint.

client:ChatGPT transport:streamable-http

Install Hungarian Postcode Validator in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://unbearable-dev--hu-postcode-validator.apify.actor/mcp

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