curl --request GET \
  --url https://api.gammaflip.io/api/v1/coins \
  --header 'X-API-Key: <api-key>'

{
  "data": {
    "coins": [
      "BTC",
      "ETH",
      "SOL",
      "XRP"
    ]
  },
  "meta": {
    "timestamp": "2026-04-14T10:00:00+00:00",
    "exchange": "all",
    "coin": "BTC",
    "rate_limit": {
      "limit": 500,
      "remaining": 487,
      "reset": "2026-04-15T00:00:00+00:00"
    }
  }
}