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

{
  "pairs": {
    "EUR/USD": {
      "base": "EUR",
      "quote": "USD",
      "alt": "EURUSD"
    },
    "GBP/USD": {
      "base": "GBP",
      "quote": "USD",
      "alt": "GBPUSD"
    },
    "USD/GBP": {
      "base": "USD",
      "quote": "GBP",
      "alt": "USDGBP"
    }
  },
  "ms": 8
}