How to Build a Crypto Portfolio Tracker Using Crypto Market Data API Add-Ons

This comprehensive guide walks you through the process of leveraging the Crypto Market Data API to create a cryptocurrency portfolio tracker. Designed for developers, it covers everything from environment setup to practical implementation, complete with sample code and API feature explanations for effective crypto market analysis.

Introduction to Crypto Market Data API

The Crypto Market Data API—developed by CoinAPI—provides access to real-time and historical market data across 350+ exchanges. This guide demonstrates how to:

Track cryptocurrency holdings.
Fetch current/historical exchange rates.
Calculate total portfolio value with interactive charts.

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Key Features of Crypto Market Data API

Endpoint	Functionality
`v1/getCurrentQuotes`	Latest price quotes for specified trading pairs.
`v1/getHistoricalExchangeRates`	Historical exchange rate data.
`v1/getAssets`	Cryptocurrency and fiat currency metadata.
`v1/getHistoricalOHLCV`	Open-high-low-close-volume (OHLCV) data.

Prerequisites

QuickNode Account: Enabled with Crypto Market Data API add-on.
Tech Stack:
- Node.js (v18.16+)
- TypeScript & ts-node
Basic Knowledge: JavaScript/TypeScript familiarity.

Step-by-Step Implementation

1. Environment Setup

Install dependencies globally:

npm install -g typescript ts-node

2. QuickNode Endpoint Configuration

Create an endpoint via QuickNode Dashboard.
Activate Crypto Market Data API add-on.
Securely store the HTTP provider URL.

3. Clone and Run the Sample App

git clone https://github.com/quiknode-labs/qn-guide-examples.git
cd sample-dapps/crypto-portfolio-tracker-with-the-crypto-market-data-api
npm install

Update .env with your endpoint:

VITE_QUICKNODE_ENDPOINT="YOUR_QUICKNODE_ENDPOINT"

Launch the app:

npm run dev

Access via http://localhost:5173/.

Application Workflow

Asset Management:
- Filter cryptocurrencies using v1/getAssets.
- Populate dropdowns for user holdings input.
Data Fetching:
- Current rates: v1/getCurrentExchangeRates.
- Historical trends: v1/getHistoricalExchangeRates.
Visualization:
- Pie charts: Asset distribution.
- Line charts: Portfolio value over time.

Innovative Use Cases

Arbitrage Opportunity Finder: Compare prices across exchanges.
Automated Trading Bot: Integrate real-time order book data.
Tax Reporting Tool: Sync historical trades for compliance.

FAQs

Q: Is the Crypto Market Data API free?
A: No—it’s a premium add-on with tiered pricing based on usage.

Q: Can I use this for stock market data?
A: The API focuses exclusively on cryptocurrency markets.

Q: How frequently is data updated?
A: Real-time endpoints refresh every 1-5 seconds, depending on the plan.

Conclusion

By integrating the Crypto Market Data API, developers can build sophisticated analytics tools, trading systems, and portfolio managers.

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