cex premium btc derived

{
  "input": {
    "type": "http",
    "method": "GET",
    "pathParams": {},
    "queryParams": {}
  },
  "output": {
    "type": "json",
    "example": {
      "as_of": "2026-01-01T00:00:00.000Z",
      "asset": "BTC-USD",
      "available": true,
      "disclaimer": "Cross-exchange premium is informational only. Spread may reflect latency, liquidity, or fees — not a pure demand signal. Not financial advice.",
      "premium_pct": 0.2,
      "sources_used": [
        {
          "role": "reference",
          "price": 61320.5,
          "exchange": "coinbase"
        },
        {
          "role": "composite",
          "price": 61195.2,
          "exchange": "okx"
        },
        {
          "role": "composite",
          "price": 61201.4,
          "exchange": "kraken"
        },
        {
          "role": "composite",
          "price": 61198.3,
          "exchange": "binance"
        }
      ],
      "coinbase_price": 61320.5,
      "interpretation": "Coinbase is trading at a +0.20% premium to global composite. Mild US/institutional demand bias.",
      "historical_note": "Point-in-time only — no 24h percentile or 30d z-score (no historical baseline stored).",
      "composite_median": 61198.3,
      "composite_source_count": 3
    },
    "example_kind": "illustrative_schema_only",
    "example_note": "Placeholder values and timestamps, not market data."
  }
}