curl --request GET \
  --url 'https://api.fastforex.io/crypto/pairs?api_key='

{
  "pairs": {
    "1INCH/BTC": {
      "base": "1INCH",
      "quote": "BTC"
    },
    "BTC/USD": {
      "base": "BTC",
      "quote": "USD"
    },
    "ETH/BTC": {
      "base": "ETH",
      "quote": "BTC"
    }
  },
  "ms": 8
}