Instapay EGP-to-USD Converter

I need a lightweight converter that takes an amount in Egyptian Pounds and instantly returns its value in US Dollars, drawing the live rate directly from Instapay Egypt or any reliable rate feed that Instapay allows. I am flexible on where you build it—web, mobile, or even a small desktop utility—as long as the code is clean, documented, and easy for me to drop into an existing workflow later.

Key points
• Only one currency pair is required for now: EGP ⇄ USD.
• The rate must refresh in real time or at a short, configurable interval.
• A simple, single-screen UI is enough; no authentication, history, or notifications are needed at this stage.
• Please include full source code, clear setup instructions, and a brief note explaining how you are fetching and updating the rate (API endpoint, polling interval, error handling).

If you can deliver a concise, stable solution that meets these specifics, let’s get started right away.