Introduction to Coinlayer API

Coinlayer is a public API that provides real-time and historical cryptocurrency exchange rates. It supports over 385 cryptocurrencies and provides data in over 25 fiat currencies. Coinlayer offers a free plan and also provides paid plans with more features.

How to use Coinlayer API

1. Signup for a free account at https://coinlayer.com.
2. Once you are logged in to your account, you can access the API key.
3. Coinlayer API supports HTTPS requests. Use the endpoint https://api.coinlayer.com to make the requests.

API examples

Get real-time exchange rates

This example code shows how to get real-time exchange rates for Bitcoin, Ethereum, and Litecoin in USD using JavaScript.

const API_KEY = 'YOUR_API_KEY';
const CRYPTOCURRENCIES = 'BTC,ETH,LTC';
const CURRENCY = 'USD';

fetch(`https://api.coinlayer.com/live?access_key=${API_KEY}&symbols=${CRYPTOCURRENCIES}&target=${CURRENCY}`)
  .then(response => response.json())
  .then(data => console.log(data.rates));

Get historical exchange rates

This example code shows how to get historical exchange rates for Bitcoin, Ethereum, and Litecoin in USD for a specific date using JavaScript.

const API_KEY = 'YOUR_API_KEY';
const CRYPTOCURRENCIES = 'BTC,ETH,LTC';
const CURRENCY = 'USD';
// Date should be in YYYY-MM-DD format
const DATE = '2021-10-21';

fetch(`https://api.coinlayer.com/${DATE}?access_key=${API_KEY}&symbols=${CRYPTOCURRENCIES}&target=${CURRENCY}`)
  .then(response => response.json())
  .then(data => console.log(data.rates));

Convert one cryptocurrency to another

This example code shows how to convert 1 Bitcoin (BTC) to 10 Ethereum (ETH) using JavaScript.

const API_KEY = 'YOUR_API_KEY';
const FROM_CURRENCY = 'BTC';
const TO_CURRENCY = 'ETH';
const AMOUNT = 1;

fetch(`https://api.coinlayer.com/convert?access_key=${API_KEY}&from=${FROM_CURRENCY}&to=${TO_CURRENCY}&amount=${AMOUNT}`)
  .then(response => response.json())
  .then(data => console.log(`1 ${FROM_CURRENCY} is equal to ${data.result} ${TO_CURRENCY}`));

Conclusion

Coinlayer API makes it easy to access real-time and historical cryptocurrency exchange rates. With the help of these examples, you can easily integrate Coinlayer API with your JavaScript application.