General info

The application was created as a recruitment task to test technical skills.

Tech-stack

• Java 16
• Spring Boot 2.5.4 with Spring Framework MVC
• Junit5 & Mockito

Client API

As a client from which I download information about cryptocurrencies, I used CoinRanking. To run the application, create an account on the website, generate an API key and paste it in the application.yml file in the api-key property.

Functionalities

Provides two endpoints:

1. GET /currencies/{currency}

where currency is a cryptocurrency symbol (e.g. BTC for bitcoin), for which server returns a quotation list. The filters parameter is available, after which you can filter in relation to which cryptocurrencies should be quoted.

example request:

GET /currencies/BTC?filter[]=USDT&filter[]=ETH

response:

{
  "source": "BTC",
  "rates": {
    "ETH": 0.0768914538,
    "USDT": 0.0000193848
  }
}

2. POST /currencies/exchange

which allows you to forecast the exchange of selected currencies.

example request:

{
    "from": "BTC",
    "to": [
        "ETH",
        "BTCS"
    ],
    "amount": 1
}

response:

{
  "ETH": {
    "rate": 0.0771233623,
    "amount": 1,
    "result": 4436.5978029030,
    "fee": 509.2317029030
  },
  "from": "BTC",
  "BTCS": {
    "rate": 0.0000002312,
    "amount": 1,
    "result": 509.2317029030,
    "fee": 509.2317029030
  }
}