If you need real-time BTC conversion (USD and BRL), polling an API every few seconds is usually not enough. A better approach is streaming quotes with WebSockets and calculating conversions as events arrive. Why WebSockets for BTC conversion?
Source: [Dev.to](https://dev.to/rubemfsv/using-websockets-to-convert-btc-to-usd-and-reais-brl-30j0)