curl --request GET \
  --url https://api.messari.io/metrics/v1/markets/metrics \
  --header 'X-Messari-API-Key: <api-key>'

{
  "error": null,
  "data": {
    "datasets": [
      {
        "slug": "price",
        "granularities": [
          "1d",
          "1h"
        ],
        "metrics": [
          {
            "name": "Timestamp",
            "slug": "time",
            "description": "Timestamp of the data point.",
            "is_timestamp": true
          },
          {
            "name": "Open Price",
            "slug": "open-price",
            "description": "USD price at the candle open.",
            "is_timestamp": false
          },
          {
            "name": "High Price",
            "slug": "high-price",
            "description": "High USD price during the candle.",
            "is_timestamp": false
          },
          {
            "name": "Low Price",
            "slug": "low-price",
            "description": "Low USD price during the candle.",
            "is_timestamp": false
          },
          {
            "name": "Close Price",
            "slug": "close-price",
            "description": "USD price at the candle close.",
            "is_timestamp": false
          }
        ]
      },
      {
        "slug": "volume",
        "granularities": [
          "1d",
          "1h"
        ],
        "metrics": [
          {
            "name": "Timestamp",
            "slug": "time",
            "description": "Timestamp of the data point.",
            "is_timestamp": true
          },
          {
            "name": "Volume",
            "slug": "volume",
            "description": "Volume traded during candle.",
            "is_timestamp": false
          }
        ]
      }
    ]
  }
}