diff --git a/modules/rcart/mod.ts b/modules/rcart/mod.ts
index 560dd6b..5f39ced 100644
--- a/modules/rcart/mod.ts
+++ b/modules/rcart/mod.ts
@@ -1370,7 +1370,7 @@ routes.post("/api/payments/:id/transak-session", async (c) => {
 
 	const host = new URL(c.req.url).hostname;
 
-	const widgetUrl = createTransakWidgetUrl({
+	const widgetParams: Record<string, string> = {
 		apiKey: transakApiKey,
 		referrerDomain: extractRootDomain(host),
 		cryptoCurrencyCode: p.token,
@@ -1383,7 +1383,19 @@ routes.post("/api/payments/:id/transak-session", async (c) => {
 		email,
 		themeColor: '6366f1',
 		hideMenu: 'true',
-	});
+	};
+
+	// Pre-fill fiat amount/currency so user sees the total immediately
+	if (p.fiatAmount) {
+		widgetParams.fiatAmount = p.fiatAmount;
+		widgetParams.defaultFiatAmount = p.fiatAmount;
+	}
+	if (p.fiatCurrency) {
+		widgetParams.fiatCurrency = p.fiatCurrency;
+		widgetParams.defaultFiatCurrency = p.fiatCurrency;
+	}
+
+	const widgetUrl = createTransakWidgetUrl(widgetParams);
 
 	return c.json({ widgetUrl });
 });
diff --git a/modules/rflows/lib/transak-onramp.ts b/modules/rflows/lib/transak-onramp.ts
index 6cfeb68..4c344a1 100644
--- a/modules/rflows/lib/transak-onramp.ts
+++ b/modules/rflows/lib/transak-onramp.ts
@@ -30,6 +30,14 @@ export class TransakOnrampAdapter implements OnrampProvider {
 			themeColor: '6366f1',
 			hideMenu: 'true',
 		};
+		if (req.fiatAmount > 0) {
+			widgetParams.fiatAmount = String(req.fiatAmount);
+			widgetParams.defaultFiatAmount = String(req.fiatAmount);
+		}
+		if (req.fiatCurrency) {
+			widgetParams.fiatCurrency = req.fiatCurrency;
+			widgetParams.defaultFiatCurrency = req.fiatCurrency;
+		}
 		if (req.returnUrl) widgetParams.redirectURL = req.returnUrl;
 
 		const widgetUrl = createTransakWidgetUrl(widgetParams);