npm install exchangerate-api
// Imports the library
const exchangeRateClient = require('exchangerate-api');
const result = await exchangeRateClient.ratesFor('USD')
result.getRate('EUR')
for(let [code, rate] of result){
console.log(code, rate)
}
result.conversion('EUR', 10)
The gem is available as open source under the terms of the MIT License.