From fa9f9bfab1176e5d1886f05d7ed004cf54df8406 Mon Sep 17 00:00:00 2001
From: appdevelopsk <app.develop.sk@gmail.com>
Date: Sun, 25 Oct 2026 21:58:23 +0900
Subject: [PATCH 01/21] fix(currency): warn users when bundled conversion rates
 are older than seven days

---
 site/src/tools/currency-converter/Component.tsx | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/site/src/tools/currency-converter/Component.tsx b/site/src/tools/currency-converter/Component.tsx
index 9b05eb0..637f489 100644
--- a/site/src/tools/currency-converter/Component.tsx
+++ b/site/src/tools/currency-converter/Component.tsx
@@ -1,6 +1,6 @@
 "use client";
 
-import { useMemo, useState } from "react";
+import { useEffect, useMemo, useState } from "react";
 import { useLocale, useTranslations } from "next-intl";
 
 import ratesData from "@/data/rates.json";
@@ -60,6 +60,14 @@ export default function CurrencyConverter() {
   const [amount, setAmount] = useState("100");
   const [from, setFrom] = useState("USD");
   const [to, setTo] = useState("JPY");
+  // The bundled fallback file may be old if a rate API fetch failed during
+  // prebuild. Compute age only after hydration to avoid static-HTML mismatch.
+  const [rateIsStale, setRateIsStale] = useState(false);
+  useEffect(() => {
+    const updated = Date.parse(`${RATES_UPDATED_AT}T00:00:00Z`);
+    const ageMs = Date.now() - updated;
+    setRateIsStale(!Number.isFinite(updated) || ageMs >= 7 * 86400000 || ageMs < -86400000);
+  }, []);
 
   function handleSwap() {
     setFrom(to);
@@ -104,6 +112,11 @@ export default function CurrencyConverter() {
 
   return (
     <div>
+      {rateIsStale && (
+        <p role="alert" className="mb-4 rounded-lg border border-amber-600 bg-amber-50 px-4 py-3 text-sm font-semibold text-amber-950 dark:bg-amber-950/30 dark:text-amber-100">
+          {t("note.staleWarning", { date: RATES_UPDATED_AT })}
+        </p>
+      )}
       <div className="mb-4 flex flex-wrap gap-1">
         {QUICK_PAIRS.map((p) => (
           <button

From 06233231bfea7698ce4d4661b385e8db83b75a49 Mon Sep 17 00:00:00 2001
From: appdevelopsk <app.develop.sk@gmail.com>
Date: Sun, 25 Oct 2026 21:59:02 +0900
Subject: [PATCH 02/21] i18n(currency): warn de readers when exchange rates are
 stale

---
 site/src/tools/currency-converter/messages/de.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/site/src/tools/currency-converter/messages/de.json b/site/src/tools/currency-converter/messages/de.json
index 09c50df..f2d9c05 100644
--- a/site/src/tools/currency-converter/messages/de.json
+++ b/site/src/tools/currency-converter/messages/de.json
@@ -16,7 +16,8 @@
     "reverseRate": "Umgekehrter Kurs"
   },
   "note": {
-    "disclaimer": "Kurse aktualisiert am {date}. Für Live-Kurse nutzen Sie eine Bank oder einen Währungsumtausch-Dienst. Dies sind Mittelkurse als Referenz — die tatsächlichen Kurse enthalten eine Handelsspanne."
+    "disclaimer": "Kurse aktualisiert am {date}. Für Live-Kurse nutzen Sie eine Bank oder einen Währungsumtausch-Dienst. Dies sind Mittelkurse als Referenz — die tatsächlichen Kurse enthalten eine Handelsspanne.",
+    "staleWarning": "Achtung: Die Referenzwechselkurse stammen vom {date} und können veraltet sein. Prüfen Sie vor Zahlungen, Währungsumtausch oder Handel aktuelle Kurse."
   },
   "button": {
     "swap": "Währungen tauschen"

From 2d790bc8234e9f5f932c374f4c736c7d71dd1bbc Mon Sep 17 00:00:00 2001
From: appdevelopsk <app.develop.sk@gmail.com>
Date: Sun, 25 Oct 2026 21:59:05 +0900
Subject: [PATCH 03/21] i18n(currency): warn en readers when exchange rates are
 stale

---
 site/src/tools/currency-converter/messages/en.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/site/src/tools/currency-converter/messages/en.json b/site/src/tools/currency-converter/messages/en.json
index 56fc861..fd93294 100644
--- a/site/src/tools/currency-converter/messages/en.json
+++ b/site/src/tools/currency-converter/messages/en.json
@@ -16,7 +16,8 @@
     "reverseRate": "Reverse rate"
   },
   "note": {
-    "disclaimer": "Rates updated {date}. For live rates, use a bank or currency exchange service. These are mid-market reference rates — actual rates include a spread."
+    "disclaimer": "Rates updated {date}. For live rates, use a bank or currency exchange service. These are mid-market reference rates — actual rates include a spread.",
+    "staleWarning": "Warning: reference exchange rates are dated {date} and may be out of date. Check a current provider before any payment, currency purchase or trade."
   },
   "button": {
     "swap": "Swap currencies"

From 7e3f3b59a4650560ef2323c75a848addb4dce91a Mon Sep 17 00:00:00 2001
From: appdevelopsk <app.develop.sk@gmail.com>
Date: Sun, 25 Oct 2026 21:59:08 +0900
Subject: [PATCH 04/21] i18n(currency): warn fr readers when exchange rates are
 stale

---
 site/src/tools/currency-converter/messages/fr.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/site/src/tools/currency-converter/messages/fr.json b/site/src/tools/currency-converter/messages/fr.json
index 78b64e8..78b0247 100644
--- a/site/src/tools/currency-converter/messages/fr.json
+++ b/site/src/tools/currency-converter/messages/fr.json
@@ -16,7 +16,8 @@
     "reverseRate": "Taux inverse"
   },
   "note": {
-    "disclaimer": "Taux mis à jour le {date}. Pour les taux en temps réel, utilisez une banque ou un service de change. Ce sont des taux de référence de marché médian — les taux réels incluent un écart."
+    "disclaimer": "Taux mis à jour le {date}. Pour les taux en temps réel, utilisez une banque ou un service de change. Ce sont des taux de référence de marché médian — les taux réels incluent un écart.",
+    "staleWarning": "Attention : les taux de change de référence datent du {date} et peuvent être obsolètes. Vérifiez les taux actuels avant tout paiement, change ou transaction."
   },
   "button": {
     "swap": "Inverser les devises"

From b02dd5b25b21e0a9572bda2ca6938e09db5f3fbc Mon Sep 17 00:00:00 2001
From: appdevelopsk <app.develop.sk@gmail.com>
Date: Sun, 25 Oct 2026 21:59:11 +0900
Subject: [PATCH 05/21] i18n(currency): warn es readers when exchange rates are
 stale

---
 site/src/tools/currency-converter/messages/es.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/site/src/tools/currency-converter/messages/es.json b/site/src/tools/currency-converter/messages/es.json
index 7e8909c..de1c344 100644
--- a/site/src/tools/currency-converter/messages/es.json
+++ b/site/src/tools/currency-converter/messages/es.json
@@ -16,7 +16,8 @@
     "reverseRate": "Tipo inverso"
   },
   "note": {
-    "disclaimer": "Tasas actualizadas el {date}. Para tasas en tiempo real, usa un banco o servicio de cambio de divisas. Estas son tasas de referencia de mercado medio — las tasas reales incluyen un diferencial."
+    "disclaimer": "Tasas actualizadas el {date}. Para tasas en tiempo real, usa un banco o servicio de cambio de divisas. Estas son tasas de referencia de mercado medio — las tasas reales incluyen un diferencial.",
+    "staleWarning": "Aviso: los tipos de cambio de referencia son del {date} y pueden estar desactualizados. Consulta tasas actuales antes de pagar, cambiar divisas u operar."
   },
   "button": {
     "swap": "Intercambiar monedas"

From 0a100984d67b5b3c2a445c81581e34ab47c1a64a Mon Sep 17 00:00:00 2001
From: appdevelopsk <app.develop.sk@gmail.com>
Date: Sun, 25 Oct 2026 21:59:13 +0900
Subject: [PATCH 06/21] i18n(currency): warn ja readers when exchange rates are
 stale

---
 site/src/tools/currency-converter/messages/ja.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/site/src/tools/currency-converter/messages/ja.json b/site/src/tools/currency-converter/messages/ja.json
index 5ee8956..0dfaa2a 100644
--- a/site/src/tools/currency-converter/messages/ja.json
+++ b/site/src/tools/currency-converter/messages/ja.json
@@ -16,7 +16,8 @@
     "reverseRate": "逆レート"
   },
   "note": {
-    "disclaimer": "レートは{date}時点の参考値です。実際の取引レートは銀行や両替所にご確認ください。表示レートは仲値（中間レート）であり、実際の取引には手数料・スプレッドが加算されます。"
+    "disclaimer": "レートは{date}時点の参考値です。実際の取引レートは銀行や両替所にご確認ください。表示レートは仲値（中間レート）であり、実際の取引には手数料・スプレッドが加算されます。",
+    "staleWarning": "注意：基準為替レートの更新日は{date}です。古い可能性があります。送金・両替・取引の前に最新のレートを確認してください。"
   },
   "button": {
     "swap": "通貨を入れ替え"

From 255132849094e21e8e2e7628d0d6d3340ec3eb8d Mon Sep 17 00:00:00 2001
From: appdevelopsk <app.develop.sk@gmail.com>
Date: Sun, 25 Oct 2026 21:59:16 +0900
Subject: [PATCH 07/21] i18n(currency): warn pt-BR readers when exchange rates
 are stale

---
 site/src/tools/currency-converter/messages/pt-BR.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/site/src/tools/currency-converter/messages/pt-BR.json b/site/src/tools/currency-converter/messages/pt-BR.json
index 6fbf9a3..b1b9354 100644
--- a/site/src/tools/currency-converter/messages/pt-BR.json
+++ b/site/src/tools/currency-converter/messages/pt-BR.json
@@ -16,7 +16,8 @@
     "reverseRate": "Taxa inversa"
   },
   "note": {
-    "disclaimer": "Taxas atualizadas em {date}. Para taxas em tempo real, use um banco ou serviço de câmbio. Estas são taxas de referência de mercado médio — as taxas reais incluem um spread."
+    "disclaimer": "Taxas atualizadas em {date}. Para taxas em tempo real, use um banco ou serviço de câmbio. Estas são taxas de referência de mercado médio — as taxas reais incluem um spread.",
+    "staleWarning": "Atenção: as taxas de câmbio de referência são de {date} e podem estar desatualizadas. Confira taxas atuais antes de pagamentos, câmbio ou operações."
   },
   "button": {
     "swap": "Inverter moedas"

From 701e4b1f8639d19bdcb9c4c9240b8c0e5463a429 Mon Sep 17 00:00:00 2001
From: appdevelopsk <app.develop.sk@gmail.com>
Date: Sun, 25 Oct 2026 21:59:19 +0900
Subject: [PATCH 08/21] i18n(currency): warn it readers when exchange rates are
 stale

---
 site/src/tools/currency-converter/messages/it.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/site/src/tools/currency-converter/messages/it.json b/site/src/tools/currency-converter/messages/it.json
index f088f6d..ec44ef6 100644
--- a/site/src/tools/currency-converter/messages/it.json
+++ b/site/src/tools/currency-converter/messages/it.json
@@ -16,7 +16,8 @@
     "reverseRate": "Tasso inverso"
   },
   "note": {
-    "disclaimer": "Tassi aggiornati il {date}. Per tassi in tempo reale, utilizza una banca o un servizio di cambio. Si tratta di tassi di riferimento del mercato medio — i tassi effettivi includono uno spread."
+    "disclaimer": "Tassi aggiornati il {date}. Per tassi in tempo reale, utilizza una banca o un servizio di cambio. Si tratta di tassi di riferimento del mercato medio — i tassi effettivi includono uno spread.",
+    "staleWarning": "Attenzione: i tassi di cambio di riferimento risalgono al {date} e potrebbero non essere aggiornati. Verifica i tassi attuali prima di pagamenti, cambi o operazioni."
   },
   "button": {
     "swap": "Inverti valute"

From 7e7cd9fa60a24236725ae9e0db498d670f31f2c0 Mon Sep 17 00:00:00 2001
From: appdevelopsk <app.develop.sk@gmail.com>
Date: Sun, 25 Oct 2026 21:59:22 +0900
Subject: [PATCH 09/21] i18n(currency): warn ru readers when exchange rates are
 stale

---
 site/src/tools/currency-converter/messages/ru.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/site/src/tools/currency-converter/messages/ru.json b/site/src/tools/currency-converter/messages/ru.json
index 4c10069..07da808 100644
--- a/site/src/tools/currency-converter/messages/ru.json
+++ b/site/src/tools/currency-converter/messages/ru.json
@@ -16,7 +16,8 @@
     "reverseRate": "Обратный курс"
   },
   "note": {
-    "disclaimer": "Курсы обновлены {date}. Для актуальных курсов обращайтесь в банк или обменный сервис. Указаны справочные курсы среднего рынка — реальные курсы включают спред."
+    "disclaimer": "Курсы обновлены {date}. Для актуальных курсов обращайтесь в банк или обменный сервис. Указаны справочные курсы среднего рынка — реальные курсы включают спред.",
+    "staleWarning": "Внимание: справочные курсы валют датированы {date} и могут быть устаревшими. Проверяйте актуальные курсы перед платежами, обменом валюты или сделками."
   },
   "button": {
     "swap": "Поменять валюты"

From eb1f22d54e9e2360e474684da67244a58f37f81b Mon Sep 17 00:00:00 2001
From: appdevelopsk <app.develop.sk@gmail.com>
Date: Sun, 25 Oct 2026 21:59:51 +0900
Subject: [PATCH 10/21] i18n(currency): explain stale exchange rate risk in ar

---
 site/src/tools/currency-converter/messages/ar.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/site/src/tools/currency-converter/messages/ar.json b/site/src/tools/currency-converter/messages/ar.json
index 0d25249..43ecf1e 100644
--- a/site/src/tools/currency-converter/messages/ar.json
+++ b/site/src/tools/currency-converter/messages/ar.json
@@ -16,7 +16,8 @@
     "reverseRate": "السعر العكسي"
   },
   "note": {
-    "disclaimer": "أسعار محدَّثة في {date}. للأسعار الفورية، استخدم بنكاً أو خدمة صرف العملات. هذه أسعار مرجعية للسوق المتوسطة — الأسعار الفعلية تشمل هامشاً."
+    "disclaimer": "أسعار محدَّثة في {date}. للأسعار الفورية، استخدم بنكاً أو خدمة صرف العملات. هذه أسعار مرجعية للسوق المتوسطة — الأسعار الفعلية تشمل هامشاً.",
+    "staleWarning": "تنبيه: أسعار الصرف المرجعية مؤرخة في {date} وقد تكون قديمة. تحقق من الأسعار الحالية قبل الدفع أو صرف العملات أو التداول."
   },
   "button": {
     "swap": "تبديل العملات"

From 8ddef69e22ae471602a5be30855dd5379607c073 Mon Sep 17 00:00:00 2001
From: appdevelopsk <app.develop.sk@gmail.com>
Date: Sun, 25 Oct 2026 21:59:55 +0900
Subject: [PATCH 11/21] i18n(currency): explain stale exchange rate risk in id

---
 site/src/tools/currency-converter/messages/id.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/site/src/tools/currency-converter/messages/id.json b/site/src/tools/currency-converter/messages/id.json
index 0ecaa5d..7066ee5 100644
--- a/site/src/tools/currency-converter/messages/id.json
+++ b/site/src/tools/currency-converter/messages/id.json
@@ -16,7 +16,8 @@
     "reverseRate": "Kurs kebalikan"
   },
   "note": {
-    "disclaimer": "Kurs diperbarui {date}. Untuk kurs langsung, gunakan bank atau layanan penukaran mata uang. Ini adalah kurs referensi pasar tengah — kurs aktual mencakup spread."
+    "disclaimer": "Kurs diperbarui {date}. Untuk kurs langsung, gunakan bank atau layanan penukaran mata uang. Ini adalah kurs referensi pasar tengah — kurs aktual mencakup spread.",
+    "staleWarning": "Peringatan: kurs referensi berasal dari {date} dan mungkin sudah kedaluwarsa. Periksa kurs terbaru sebelum pembayaran, penukaran mata uang, atau perdagangan."
   },
   "button": {
     "swap": "Tukar mata uang"

From 5568525f0bc4420aa62800af6032415a75666854 Mon Sep 17 00:00:00 2001
From: appdevelopsk <app.develop.sk@gmail.com>
Date: Sun, 25 Oct 2026 21:59:58 +0900
Subject: [PATCH 12/21] i18n(currency): explain stale exchange rate risk in ko

---
 site/src/tools/currency-converter/messages/ko.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/site/src/tools/currency-converter/messages/ko.json b/site/src/tools/currency-converter/messages/ko.json
index d91e4b4..69afc72 100644
--- a/site/src/tools/currency-converter/messages/ko.json
+++ b/site/src/tools/currency-converter/messages/ko.json
@@ -16,7 +16,8 @@
     "reverseRate": "역환율"
   },
   "note": {
-    "disclaimer": "환율은 {date} 기준입니다. 실시간 환율은 은행이나 환전 서비스를 이용하세요. 이 환율은 중간 시장 참조 환율이며 실제 환율에는 스프레드가 포함됩니다."
+    "disclaimer": "환율은 {date} 기준입니다. 실시간 환율은 은행이나 환전 서비스를 이용하세요. 이 환율은 중간 시장 참조 환율이며 실제 환율에는 스프레드가 포함됩니다.",
+    "staleWarning": "주의: 기준 환율은 {date} 기준이므로 오래되었을 수 있습니다. 결제, 환전 또는 거래 전에 최신 환율을 확인하세요."
   },
   "button": {
     "swap": "통화 교체"

From 54c2259c31bc69e6a7608ca4002176ce96ce5a0e Mon Sep 17 00:00:00 2001
From: appdevelopsk <app.develop.sk@gmail.com>
Date: Sun, 25 Oct 2026 22:00:02 +0900
Subject: [PATCH 13/21] i18n(currency): explain stale exchange rate risk in th

---
 site/src/tools/currency-converter/messages/th.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/site/src/tools/currency-converter/messages/th.json b/site/src/tools/currency-converter/messages/th.json
index 2a3e0c4..eb4a4e2 100644
--- a/site/src/tools/currency-converter/messages/th.json
+++ b/site/src/tools/currency-converter/messages/th.json
@@ -22,7 +22,8 @@
     "reverseRate": "อัตราย้อนกลับ"
   },
   "note": {
-    "disclaimer": "อัตราอัปเดตเมื่อ {date} สำหรับอัตราแบบเรียลไทม์ให้ใช้ธนาคารหรือบริการแลกเปลี่ยนเงินตรา นี่คืออัตราอ้างอิงตลาดกลาง — อัตราจริงมีส่วนต่าง (spread) รวมอยู่ด้วย"
+    "disclaimer": "อัตราอัปเดตเมื่อ {date} สำหรับอัตราแบบเรียลไทม์ให้ใช้ธนาคารหรือบริการแลกเปลี่ยนเงินตรา นี่คืออัตราอ้างอิงตลาดกลาง — อัตราจริงมีส่วนต่าง (spread) รวมอยู่ด้วย",
+    "staleWarning": "คำเตือน: อัตราแลกเปลี่ยนอ้างอิงเป็นข้อมูลวันที่ {date} และอาจล้าสมัย โปรดตรวจสอบอัตราล่าสุดก่อนชำระเงิน แลกเงิน หรือซื้อขาย"
   },
   "button": {
     "swap": "สลับสกุลเงิน"

From 37e9952fd76f813a86b71d487cc05e5e77432556 Mon Sep 17 00:00:00 2001
From: appdevelopsk <app.develop.sk@gmail.com>
Date: Sun, 25 Oct 2026 22:00:05 +0900
Subject: [PATCH 14/21] i18n(currency): explain stale exchange rate risk in hi

---
 site/src/tools/currency-converter/messages/hi.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/site/src/tools/currency-converter/messages/hi.json b/site/src/tools/currency-converter/messages/hi.json
index 657b23e..0e5a4cc 100644
--- a/site/src/tools/currency-converter/messages/hi.json
+++ b/site/src/tools/currency-converter/messages/hi.json
@@ -16,7 +16,8 @@
     "reverseRate": "विपरीत दर"
   },
   "note": {
-    "disclaimer": "दरें {date} को अपडेट की गई हैं। लाइव दरों के लिए बैंक या मनी ट्रांसफर सेवा का उपयोग करें। ये मध्य-बाज़ार संदर्भ दरें हैं — वास्तविक दरों में स्प्रेड शामिल होता है।"
+    "disclaimer": "दरें {date} को अपडेट की गई हैं। लाइव दरों के लिए बैंक या मनी ट्रांसफर सेवा का उपयोग करें। ये मध्य-बाज़ार संदर्भ दरें हैं — वास्तविक दरों में स्प्रेड शामिल होता है।",
+    "staleWarning": "चेतावनी: संदर्भ विनिमय दरें {date} की हैं और पुरानी हो सकती हैं। भुगतान, मुद्रा विनिमय या ट्रेड से पहले वर्तमान दरें जाँचें।"
   },
   "button": {
     "swap": "मुद्राएँ बदलें"

From 85148c3529e950941814f75f61213aca322c8de3 Mon Sep 17 00:00:00 2001
From: appdevelopsk <app.develop.sk@gmail.com>
Date: Sun, 25 Oct 2026 22:00:08 +0900
Subject: [PATCH 15/21] i18n(currency): explain stale exchange rate risk in
 zh-CN

---
 site/src/tools/currency-converter/messages/zh-CN.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/site/src/tools/currency-converter/messages/zh-CN.json b/site/src/tools/currency-converter/messages/zh-CN.json
index 7f1b92d..46aed84 100644
--- a/site/src/tools/currency-converter/messages/zh-CN.json
+++ b/site/src/tools/currency-converter/messages/zh-CN.json
@@ -16,7 +16,8 @@
     "reverseRate": "反向汇率"
   },
   "note": {
-    "disclaimer": "汇率更新于{date}。实时汇率请使用银行或货币兑换服务。此处为中间市场参考汇率，实际汇率包含买卖差价。"
+    "disclaimer": "汇率更新于{date}。实时汇率请使用银行或货币兑换服务。此处为中间市场参考汇率，实际汇率包含买卖差价。",
+    "staleWarning": "警告：参考汇率日期为 {date}，可能已经过时。付款、换汇或交易前请核实最新汇率。"
   },
   "button": {
     "swap": "互换货币"

From 9e8cf4e489f799fa82e4160756fe0caaa1faf0d4 Mon Sep 17 00:00:00 2001
From: appdevelopsk <app.develop.sk@gmail.com>
Date: Sun, 25 Oct 2026 22:00:11 +0900
Subject: [PATCH 16/21] i18n(currency): explain stale exchange rate risk in tr

---
 site/src/tools/currency-converter/messages/tr.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/site/src/tools/currency-converter/messages/tr.json b/site/src/tools/currency-converter/messages/tr.json
index 23e8959..38a1a66 100644
--- a/site/src/tools/currency-converter/messages/tr.json
+++ b/site/src/tools/currency-converter/messages/tr.json
@@ -16,7 +16,8 @@
     "reverseRate": "Ters kur"
   },
   "note": {
-    "disclaimer": "Kurlar {date} tarihinde güncellendi. Anlık kurlar için bir banka veya döviz bürosu kullanın. Bunlar orta piyasa referans kurlarıdır — gerçek kurlar alış-satış farkını içerir."
+    "disclaimer": "Kurlar {date} tarihinde güncellendi. Anlık kurlar için bir banka veya döviz bürosu kullanın. Bunlar orta piyasa referans kurlarıdır — gerçek kurlar alış-satış farkını içerir.",
+    "staleWarning": "Uyarı: Referans döviz kurları {date} tarihine aittir ve güncel olmayabilir. Ödeme, döviz bozdurma veya işlem yapmadan önce güncel kurları kontrol edin."
   },
   "button": {
     "swap": "Para birimlerini değiştir"

From 580e1737bcbb629e5c54326f93f4046f492dd626 Mon Sep 17 00:00:00 2001
From: appdevelopsk <app.develop.sk@gmail.com>
Date: Sun, 25 Oct 2026 22:00:14 +0900
Subject: [PATCH 17/21] i18n(currency): explain stale exchange rate risk in
 zh-TW

---
 site/src/tools/currency-converter/messages/zh-TW.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/site/src/tools/currency-converter/messages/zh-TW.json b/site/src/tools/currency-converter/messages/zh-TW.json
index 45a932c..2e8700a 100644
--- a/site/src/tools/currency-converter/messages/zh-TW.json
+++ b/site/src/tools/currency-converter/messages/zh-TW.json
@@ -16,7 +16,8 @@
     "reverseRate": "反向匯率"
   },
   "note": {
-    "disclaimer": "匯率更新於{date}。即時匯率請使用銀行或外匯服務。此處為中間市場參考匯率，實際匯率包含買賣價差。"
+    "disclaimer": "匯率更新於{date}。即時匯率請使用銀行或外匯服務。此處為中間市場參考匯率，實際匯率包含買賣價差。",
+    "staleWarning": "警告：參考匯率日期為 {date}，可能已經過時。付款、換匯或交易前請確認最新匯率。"
   },
   "button": {
     "swap": "互換貨幣"

From 94be372a4ef5fba9f9f582b8d77c99f00e89a072 Mon Sep 17 00:00:00 2001
From: appdevelopsk <app.develop.sk@gmail.com>
Date: Sun, 25 Oct 2026 22:00:17 +0900
Subject: [PATCH 18/21] i18n(currency): explain stale exchange rate risk in vi

---
 site/src/tools/currency-converter/messages/vi.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/site/src/tools/currency-converter/messages/vi.json b/site/src/tools/currency-converter/messages/vi.json
index b217deb..c1a7d1f 100644
--- a/site/src/tools/currency-converter/messages/vi.json
+++ b/site/src/tools/currency-converter/messages/vi.json
@@ -16,7 +16,8 @@
     "reverseRate": "Tỷ giá ngược"
   },
   "note": {
-    "disclaimer": "Tỷ giá cập nhật ngày {date}. Để có tỷ giá thời gian thực, hãy dùng ngân hàng hoặc dịch vụ đổi tiền. Đây là tỷ giá tham chiếu thị trường trung bình — tỷ giá thực tế bao gồm phí chênh lệch."
+    "disclaimer": "Tỷ giá cập nhật ngày {date}. Để có tỷ giá thời gian thực, hãy dùng ngân hàng hoặc dịch vụ đổi tiền. Đây là tỷ giá tham chiếu thị trường trung bình — tỷ giá thực tế bao gồm phí chênh lệch.",
+    "staleWarning": "Cảnh báo: tỷ giá tham khảo được cập nhật ngày {date} và có thể đã cũ. Hãy kiểm tra tỷ giá mới nhất trước khi thanh toán, đổi tiền hoặc giao dịch."
   },
   "button": {
     "swap": "Hoán đổi tiền tệ"

From 7d1aee958715d462e759ff7cba82c98052a9dd9d Mon Sep 17 00:00:00 2001
From: appdevelopsk <app.develop.sk@gmail.com>
Date: Sun, 25 Oct 2026 22:01:08 +0900
Subject: [PATCH 19/21] test: verify currency fallback date, validity and all
 17 stale-rate disclosures

---
 .../scripts/check-currency-rate-freshness.mjs | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 site/scripts/check-currency-rate-freshness.mjs

diff --git a/site/scripts/check-currency-rate-freshness.mjs b/site/scripts/check-currency-rate-freshness.mjs
new file mode 100644
index 0000000..dd2ed20
--- /dev/null
+++ b/site/scripts/check-currency-rate-freshness.mjs
@@ -0,0 +1,30 @@
+/** Verify that stale FX fallback cannot ship without visible localized disclosure. */
+import { readFileSync, readdirSync } from "node:fs";
+import { dirname, join } from "node:path";
+import { fileURLToPath } from "node:url";
+const root = join(dirname(fileURLToPath(import.meta.url)), "..");
+const rates = JSON.parse(readFileSync(join(root, "src/data/rates.json"), "utf8"));
+const component = readFileSync(join(root, "src/tools/currency-converter/Component.tsx"), "utf8");
+const localeDir = join(root, "src/tools/currency-converter/messages");
+const names = readdirSync(localeDir).filter(x => x.endsWith(".json"));
+const errors = [];
+const updated = Date.parse(String(rates.updatedAt) + "T00:00:00Z");
+if (!Number.isFinite(updated) || !/^\d{4}-\d{2}-\d{2}$/.test(rates.updatedAt)) errors.push("Invalid rates date");
+if (rates.base !== "USD" || rates.rates?.USD !== 1) errors.push("Unexpected rate base");
+if (!rates.rates || Object.values(rates.rates).some(v=>typeof v !== "number" || !Number.isFinite(v) || v<=0)) errors.push("Invalid rate entries");
+if (!component.includes('role="alert"') || !component.includes('note.staleWarning') || !component.includes('ageMs >= 7 * 86400000')) errors.push("Missing client stale-rate alert");
+for (const file of names) {
+  try {
+    const msg=JSON.parse(readFileSync(join(localeDir,file),"utf8"));
+    const v=msg.note?.staleWarning;
+    if (typeof v!=="string" || !v.includes("{date}") || v.length<25) errors.push(file+": missing localized stale warning");
+  } catch(e) { errors.push(file+": unreadable translation "+String(e)); }
+}
+if (errors.length) {
+  console.error("[currency-rates] FAIL: "+errors.join(" | "));
+  process.exitCode=1;
+} else {
+  const age = Math.floor((Date.now() - updated)/86400000);
+  if (age >= 7 || age < -1) console.warn("[currency-rates] WARNING: cached rate is "+age+" days old. Live page must display warning until refreshed.");
+  console.log("[currency-rates] PASS: validated "+names.length+" localized stale warnings and currency base");
+}

From 961582183637b7a71885bf84db8cd015bd743d6c Mon Sep 17 00:00:00 2001
From: appdevelopsk <app.develop.sk@gmail.com>
Date: Sun, 25 Oct 2026 22:01:12 +0900
Subject: [PATCH 20/21] build: audit all currency locale warnings and stale
 fallback health before release

---
 site/package.json | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/site/package.json b/site/package.json
index 371dca5..57d0f1a 100644
--- a/site/package.json
+++ b/site/package.json
@@ -9,7 +9,7 @@
     "lint": "next lint",
     "typecheck": "tsc --noEmit",
     "fetch:rates": "tsx scripts/fetch-rates.ts",
-    "prebuild": "tsx scripts/fetch-rates.ts && node scripts/check-pressure-reference.mjs",
+    "prebuild": "tsx scripts/fetch-rates.ts && node scripts/check-pressure-reference.mjs && node scripts/check-currency-rate-freshness.mjs",
     "sitemap": "tsx scripts/generate-sitemap.ts",
     "validate": "tsx scripts/validate.ts",
     "audit:seo": "tsx scripts/audit-seo.ts",
@@ -20,7 +20,8 @@
     "indexnow": "tsx scripts/indexnow.ts",
     "report:calculate": "node scripts/calculate-ranking.mjs",
     "postbuild": "node scripts/check-built-titles.mjs && node scripts/check-built-canonical.mjs && node scripts/check-built-descriptions.mjs",
-    "check:pressure": "node scripts/check-pressure-reference.mjs"
+    "check:pressure": "node scripts/check-pressure-reference.mjs",
+    "check:currency": "node scripts/check-currency-rate-freshness.mjs"
   },
   "dependencies": {
     "@types/qrcode": "^1.5.6",

From 7ba42c5c488a0ba04a6844aeac44fc0ddbcba4c6 Mon Sep 17 00:00:00 2001
From: appdevelopsk <app.develop.sk@gmail.com>
Date: Sun, 25 Oct 2026 22:02:24 +0900
Subject: [PATCH 21/21] docs: document stale fallback disclosure and production
 QA

---
 site/docs/CURRENCY_RATE_FRESHNESS_2026-10-25.md | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 site/docs/CURRENCY_RATE_FRESHNESS_2026-10-25.md

diff --git a/site/docs/CURRENCY_RATE_FRESHNESS_2026-10-25.md b/site/docs/CURRENCY_RATE_FRESHNESS_2026-10-25.md
new file mode 100644
index 0000000..5df4847
--- /dev/null
+++ b/site/docs/CURRENCY_RATE_FRESHNESS_2026-10-25.md
@@ -0,0 +1,16 @@
+# Toolify365 FX rate freshness (2026-10-25)
+
+**Observed source risk:** `site/src/data/rates.json` fallback is dated 2026-09-03. `scripts/fetch-rates.ts` fetches live reference rates at prebuild and intentionally retains fallback on upstream network failure. The GitHub fallback date **does not prove** production currently serves stale rates; live builds may have refreshed successfully.
+
+## Fixed
+- The 31-currency calculator now shows a prominent, translated warning when embedded reference rates are >=7 days old (or malformed/future-dated), rather than relying solely on a small ordinary disclaimer.
+- All 17 locale JSON files have `note.staleWarning` with a date placeholder; no bank account details or payment data collected.
+- Prebuild `node scripts/check-currency-rate-freshness.mjs` validates USD base, finite positive rates, date and all localized warning strings. Old fallback rates produce a **warning**, not a failed global website build. `npm run check:currency` provides an independent check.
+- Calculator formulas/amount handling, SEO indexability, robots, sitemaps and conversion rates were not rewritten. No unverified "live" conversion claim is made.
+
+## Release checks
+1. From `site/`: `npm run fetch:rates && npm run check:currency && npm run build`.
+2. If the rate endpoint is unavailable and the fallback is older than 7 days, the UI must show the stale warning in all locales (test date 2026-09-03).
+3. If the prebuild fetch succeeds with a current date, warning should not appear. The ordinary reference-rate date disclaimer remains.
+4. Verify on real production `/en/tools/currency-converter` and `/ja/tools/currency-converter`; changes merged to GitHub do not prove live deployment.
+5. Rates are indicative and bank/exchange spread differs; never make direct financial decisions on stale numbers.