curl --request GET \
  --url https://api.blockworks.com/v1/assets/{idOrSlug}/market-cap \
  --header 'x-api-key: <api-key>'

{
  "rank": 2,
  "usd": 4456.91,
  "dominance": 11.9754,
  "percent_change_btc_1h": -0.134556,
  "percent_change_btc_24h": -1.56252,
  "percent_change_usd_1h": 0.0999065,
  "percent_change_usd_24h": -0.63777,
  "percent_change_usd_7d": 2.94011,
  "percent_change_usd_30d": 2.0461,
  "percent_change_eth_1h": 0,
  "percent_change_eth_24h": 0,
  "updated_at": 1759940402,
  "asset_code": "ETH",
  "asset_slug": "ethereum"
}