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Fix DXY formula + switch market data to FRED

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Capucine Gest
2026-05-28 19:43:39 +02:00
parent 0a779fb4eb
commit 0a2daed3bf
2 changed files with 75 additions and 95 deletions
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app/api/fx/route.ts
+5 -1
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@@ -48,8 +48,12 @@ async function fetchFrankfurter() {
// DXY approximé depuis les taux ECB (même formule que la branche AV)
// rates.X = "1 USD = X unités" — même convention que AV
const e = rates.EUR, g = rates.GBP, j = rates.JPY, c = rates.CAD, ch = rates.CHF;
// DXY = 50.14 × EURUSD^-0.576 × USDJPY^0.136 × GBPUSD^-0.119 × USDCAD^0.091 × USDCHF^0.036
// Frankfurter from=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 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(2))
? 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 NextResponse.json({ rates, dxy, base: "USD", source: "frankfurter", date: data.date });