curl --request GET \
  --url https://api.coingecko.com/api/v3/global/decentralized_finance_defi \
  --header 'x-cg-demo-api-key: <api-key>'

{
  "data": {
    "defi_market_cap": "93264745839.10368680452390205264",
    "eth_market_cap": "250923489878.18163813287624277972",
    "defi_to_eth_ratio": "37.1685990356589832537094209337357070624927603988429231656080063710045566",
    "trading_volume_24h": "3779246981.777563895687957584391",
    "defi_dominance": "3.5568819863542411077651904276222133821656380942701140395041020219966392",
    "top_coin_name": "Lido Staked Ether",
    "top_coin_defi_dominance": 19.77898778734103
  }
}