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  "title": "Railway Express \u00b7 BTC-equity correlation insight",
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    "Build risk models for crypto-equity portfolios",
    "Generate automated market commentary on BTC-SPX divergence",
    "Trigger rebalancing when correlation breaks historical ranges",
    "Backtest hedging strategies using rolling correlations"
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          "queryParams": {
            "lang": "en",
            "index": "sp500",
            "period_days": "30"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "index": "sp500",
            "correlation": -0.25,
            "period_days": 30,
            "btc_return_pct": 3.21,
            "index_return_pct": -3.14
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      "priceSpecification": {
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        "unitText": "call",
        "priceCurrency": "USDC"
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    "sameAs": "https://express-legacy-production.up.railway.app/crypto/btc-equity-correlation/insight",
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    "description": "Get Bitcoin to equity index correlation analysis via x402 micropayment. $0.03 per call. Returns correlation coefficient, returns data, and period metrics.",
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    "applicationCategory": "finance"
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}