curl --request GET \
  --url https://api.amberdata.com/blockchains/marketcap \
  --header 'x-api-key: <api-key>'

{
  "status": 200,
  "title": "OK",
  "description": "Successful request",
  "payload": {
    "data": [
      {
        "blockchainSlug": "bitcoin-mainnet",
        "circulatingSupply": "19594996.160661350000",
        "marketCapUSD": "905077909973.43",
        "maxSupply": "21000000",
        "name": "bitcoin",
        "priceUSD": "46189.236402630916818023",
        "symbol": "btc",
        "timestamp": "2024-01-10",
        "totalSupply": "19594996.160661350000"
      }
    ],
    "metadata": {}
  }
}