CoinMarketCap Data Module (cmcClient.js)

A lightweight Node.js module for fetching real‑time and historical cryptocurrency market data from the CoinMarketCap Pro API.
Designed for trading bots, analytics dashboards, research tools, and alert systems.

Key Features

• Get the latest quote (price, volume, market cap, etc.) for any supported symbol (e.g., BTC, ETH).
• Fetch historical OHLCV (open, high, low, close, volume) data up to 6 months back (depending on your CMC plan).
• Simple, promise‑based API using axios.
• Clean, easily extensible code structure for advanced use cases.

Who Is This For?

For customers (non‑developers)

• You want a bot or app that:
  • Tracks live prices from CoinMarketCap.
  • Looks at past price movements to decide when to buy/sell.
  • Uses reputable, standardized market data instead of random sources.
• This module is the data engine behind that: it gives your application accurate, structured market data so your strategies can run safely and consistently.

You don’t have to touch the code yourself—your developer/team can plug this module into your system.

For developers

• You need a reusable Node.js wrapper for the CoinMarketCap Pro API.
• You want to:
  • Pull latest quotes by symbol.
  • Pull historical OHLCV data for backtesting and signal generation.
• The module is intentionally minimal and idiomatic, so you can:
  • Extend it with more endpoints.
  • Swap it into existing projects.
  • Integrate it into microservices, workers, or cron jobs.

Prerequisites

• Node.js: v16+ recommended.
• A CoinMarketCap Pro API key (free or paid plan).

Sign up and obtain an API key from the CoinMarketCap Developer Portal.

Installation

1. Add the required dependencies to your project:

npm install axios dotenv