Building a Crypto Portfolio Tracker with CoinMarketCap API

A portfolio tracker is a tool that helps users monitor their cryptocurrency holdings in real-time. In this guide, we'll show you how to build one using the CoinMarketCap API.

The live valuation half of the tracker can run without an API key, but performance over time requires a free key. To get started, users need to resolve ticker symbols to stable IDs, which are unique and trustworthy numbers for every asset held.

This is where the CoinMarketCap API comes in handy. The API provides a way to fetch current prices for assets without needing an account or credentials. In this example, we'll use the /v1/cryptocurrency/map endpoint to resolve ticker symbols to IDs.