A Telegram Mini App that monitors currency rates: collects prices from multiple platforms, stores history, and sends alerts when rates change.
Request
The client was launching a service from scratch and needed a tool to track currency rates. The requirements were to collect quotes from seven platforms, store three months of price history, and set up user broadcasts when rates change.
Implementation
We built a Mini App in the iOS 26 style: rates by pair across platforms, favorites, and a three-month chart. Where APIs existed, we integrated them; elsewhere we used parsing. The storage processes minute-level data from 30+ sources and builds OHLC. Broadcasts respect the Telegram limit of up to 30 messages per second. We also added pair categories and referral links to an exchanger.
Results
In the first week the service gained over a thousand regular users. Users compare rates across platforms in one app, view three-month charts, and get alerts when prices change.
