Get a free API key

50 calls per month, no credit card. Anonymous use stays available: 20 calls/day.

Then call it

curl "https://hk-transit.rowb.app/health"

Or from an AI agent

POST https://hk-transit.rowb.app/mcp     (mtr_fare and subsidy_amount need no key)

What the key is for

50 calls a month: MTR fares, the subsidy calculation, recording trips, and a monthly total with a CSV. Everything on this page is free. No card, no trial, no expiry.