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Fix DXY formula + switch market data to FRED

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Capucine Gest
2026-05-28 19:47:26 +02:00
parent 0a2daed3bf
commit dc06c5528f
1 changed files with 5 additions and 3 deletions
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app/api/fx/route.ts
+5 -3
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@@ -29,11 +29,13 @@ async function fetchAV(apiKey: string) {
} catch { /* skip on error */ }
}
if (Object.keys(rates).length < 4) return null; // too many failures → fall back
// Approximate DXY from fetched pairs (no extra AV call needed)
// DXY = 50.14 × EUR^0.576 × (1/JPY)^0.136 × GBP^0.119 × (1/CAD)^0.091 × (1/CHF)^0.036
// DXY = 50.14 × EURUSD^-0.576 × USDJPY^0.136 × GBPUSD^-0.119 × USDCAD^0.091 × USDCHF^0.036
// AV from_currency=USD → e=USD/EUR, j=JPY/USD, g=USD/GBP, c=CAD/USD, ch=CHF/USD
// ⟹ EURUSD=1/e → e^0.576 ; USDJPY=j → j^0.136 ; GBPUSD=1/g → g^0.119
// USDCAD=c → c^0.091 ; USDCHF=ch → ch^0.036
const e = rates.EUR, g = rates.GBP, j = rates.JPY, c = rates.CAD, ch = rates.CHF;
const dxy = (e && g && j && c && ch)
? parseFloat((50.14348112 * Math.pow(e,0.576) * Math.pow(1/j,0.136) * Math.pow(g,0.119) * Math.pow(1/c,0.091) * Math.pow(1/ch,0.036)).toFixed(3))
? parseFloat((50.14348112 * Math.pow(e,0.576) * Math.pow(j,0.136) * Math.pow(g,0.119) * Math.pow(c,0.091) * Math.pow(ch,0.036)).toFixed(2))
: null;
return { rates, dxy, base: "USD", source: "alphavantage", timestamp: Date.now() };
}