curl --request GET \
  --url https://pro-api.coingecko.com/api/v3/coins/categories \
  --header 'x-cg-pro-api-key: <api-key>'

[
  {
    "id": "smart-contract-platform",
    "name": "Smart Contract Platform",
    "market_cap": 2176528015490.1301,
    "market_cap_change_24h": -0.4907335508040635,
    "content": "Smart contract platforms are usually blockchains that host smart contracts or decentralized applications.",
    "top_3_coins_id": [
      "bitcoin",
      "ethereum",
      "binancecoin"
    ],
    "top_3_coins": [
      "https://coin-images.coingecko.com/coins/images/1/small/bitcoin.png",
      "https://coin-images.coingecko.com/coins/images/279/small/ethereum.png",
      "https://coin-images.coingecko.com/coins/images/825/small/bnb-icon2_2x.png"
    ],
    "volume_24h": 45616943988.58024,
    "updated_at": "2026-05-26T10:02:24.777Z"
  },
  {
    "id": "layer-1",
    "name": "Layer 1 (L1)",
    "market_cap": 2152576804747.1516,
    "market_cap_change_24h": -0.538526079299288,
    "content": "Layer 1 serves as the primary and autonomous chain on which transactions are directly executed and confirmed.",
    "top_3_coins_id": [
      "bitcoin",
      "ethereum",
      "binancecoin"
    ],
    "top_3_coins": [
      "https://coin-images.coingecko.com/coins/images/1/small/bitcoin.png",
      "https://coin-images.coingecko.com/coins/images/279/small/ethereum.png",
      "https://coin-images.coingecko.com/coins/images/825/small/bnb-icon2_2x.png"
    ],
    "volume_24h": 44289945362.19749,
    "updated_at": "2026-05-26T10:01:55.213Z"
  }
]