fix: filter non-finite and zero price samples before rendering chart

feat: add swap screen UI (sats -> USD) with price chart

README.md

@@ -214,7 +214,7 @@ flutter build apk --release --target-platform android-arm64
 │    flutter_rust_bridge v2.11.1 (FFI)    │
 ├─────────────────────────────────────────┤
 │        elcaju_core (Rust interno)       │
-│   CDK 0.15.1 + SQLite + BIP39 + Tokio  │
+│   CDK 0.16.0 + SQLite + BIP39 + Tokio  │
 └─────────────────────────────────────────┘
 ```
 
@@ -256,7 +256,7 @@ elcaju/
 │   │   └── scanner/               # QR scanner widget
 │   └── l10n/                      # 11 languages (354 translation keys)
 ├── rust/
-│   ├── Cargo.toml                 # elcaju_core: CDK 0.15.1, flutter_rust_bridge 2.11.1
+│   ├── Cargo.toml                 # elcaju_core: CDK 0.16.0, flutter_rust_bridge 2.11.1
 │   └── src/api/                   # wallet, token, keys, mint_info, error
 ├── rust_builder/                  # Cargokit integration (auto Rust compilation)
 ├── android/                       # Android config (NDK 27.0, NFC HCE service)

lib/core/services/price_service.dart

@@ -1,4 +1,5 @@
 import 'dart:convert';
+import 'dart:math';
 import 'package:http/http.dart' as http;
 
 /// Servicio para obtener precios de Bitcoin usando Yadio API
@@ -86,4 +87,59 @@ class PriceService {
     // Retornar en centavos
     return BigInt.from((fiatAmount * 100).round());
   }
+
+  // --- Blink API (precios históricos) ---
+
+  static const _blinkUrl = 'https://api.blink.sv/graphql';
+
+  /// Obtiene precios históricos de BTC desde Blink API.
+  /// range: ONE_DAY, ONE_WEEK, ONE_MONTH, ONE_YEAR, FIVE_YEARS
+  static Future<List<PricePoint>> getHistoricalPrices({
+    String range = 'ONE_DAY',
+  }) async {
+    try {
+      final response = await http.post(
+        Uri.parse(_blinkUrl),
+        headers: {'Content-Type': 'application/json'},
+        body: jsonEncode({
+          'query':
+              'query { btcPriceList(range: $range) { price { base offset } timestamp } }',
+        }),
+      ).timeout(const Duration(seconds: 15));
+
+      if (response.statusCode != 200) {
+        throw Exception('Error HTTP: ${response.statusCode}');
+      }
+
+      final json = jsonDecode(response.body) as Map<String, dynamic>;
+      final data = json['data'] as Map<String, dynamic>?;
+      if (data == null) throw Exception('No data in response');
+
+      final list = data['btcPriceList'] as List?;
+      if (list == null || list.isEmpty) {
+        throw Exception('No historical prices in response');
+      }
+
+      return list.map((point) {
+        final price = point['price'] as Map<String, dynamic>;
+        final base = (price['base'] as num).toDouble();
+        final offset = (price['offset'] as num).toInt();
+        // base / 10^offset = USD cents → /100 = USD
+        final priceUsd = base / pow(10, offset) / 100;
+        final timestamp = (point['timestamp'] as num).toInt();
+
+        return PricePoint(timestamp: timestamp, priceUsd: priceUsd);
+      }).toList();
+    } catch (e) {
+      throw Exception('Error obteniendo precios históricos: $e');
+    }
+  }
+}
+
+/// Punto de precio histórico de BTC
+class PricePoint {
+  final int timestamp;
+  final double priceUsd;
+
+  PricePoint({required this.timestamp, required this.priceUsd});
 }

lib/l10n/app_de.arb

@@ -559,5 +559,21 @@
   "requestPaymentReceived": "Zahlung erhalten",
   "requestDescriptionHint": "Beschreibung (optional)",
   "universal": "Universal",
-  "copiedToClipboard": "In die Zwischenablage kopiert"
+  "copiedToClipboard": "In die Zwischenablage kopiert",
+
+  "swap": "Tauschen",
+  "swapDescription": "Zwischen Sats und USD wechseln",
+  "swapFrom": "Von",
+  "swapTo": "Nach",
+  "swapAction": "Tauschen",
+  "swapEstimatedFee": "Geschätzte Gebühr",
+  "swapUseAll": "Alles verwenden",
+  "swapMinimum": "Minimum: {amount}",
+  "swapProcessing": "Swap wird verarbeitet...",
+  "swapSuccess": "Swap abgeschlossen",
+  "swapErrorInsufficient": "Unzureichendes Guthaben",
+  "swapErrorExpired": "Angebot abgelaufen",
+  "swapErrorGeneric": "Swap-Fehler: {error}",
+  "swapChartUnavailable": "Preis nicht verfügbar · Tippen zum Wiederholen",
+  "swapChartMinMax": "24h  Min: {minPrice} — Max: {maxPrice}"
 }

lib/l10n/app_en.arb

@@ -452,5 +452,21 @@
   "requestPaymentReceived": "Payment received",
   "requestDescriptionHint": "Description (optional)",
   "universal": "Universal",
-  "copiedToClipboard": "Copied to clipboard"
+  "copiedToClipboard": "Copied to clipboard",
+
+  "swap": "Swap",
+  "swapDescription": "Convert between sats and USD",
+  "swapFrom": "From",
+  "swapTo": "To",
+  "swapAction": "Swap",
+  "swapEstimatedFee": "Estimated fee",
+  "swapUseAll": "Use all",
+  "swapMinimum": "Minimum: {amount}",
+  "swapProcessing": "Processing swap...",
+  "swapSuccess": "Swap completed",
+  "swapErrorInsufficient": "Insufficient balance",
+  "swapErrorExpired": "Quote has expired",
+  "swapErrorGeneric": "Swap error: {error}",
+  "swapChartUnavailable": "Price unavailable · Tap to retry",
+  "swapChartMinMax": "24h  Min: {minPrice} — Max: {maxPrice}"
 }

lib/l10n/app_es.arb

@@ -572,5 +572,37 @@
   "requestPaymentReceived": "Pago recibido",
   "requestDescriptionHint": "Descripción (opcional)",
   "universal": "Universal",
-  "copiedToClipboard": "Copiado al portapapeles"
+  "copiedToClipboard": "Copiado al portapapeles",
+
+  "swap": "Cambiar",
+  "swapDescription": "Convertir entre sats y USD",
+  "swapFrom": "De",
+  "swapTo": "A",
+  "swapAction": "Cambiar",
+  "swapEstimatedFee": "Fee estimado",
+  "swapUseAll": "Usar todo",
+  "swapMinimum": "Mínimo: {amount}",
+  "@swapMinimum": {
+    "placeholders": {
+      "amount": { "type": "String" }
+    }
+  },
+  "swapProcessing": "Procesando swap...",
+  "swapSuccess": "Swap completado",
+  "swapErrorInsufficient": "Saldo insuficiente",
+  "swapErrorExpired": "La cotización ha expirado",
+  "swapErrorGeneric": "Error en el swap: {error}",
+  "@swapErrorGeneric": {
+    "placeholders": {
+      "error": { "type": "String" }
+    }
+  },
+  "swapChartUnavailable": "Precio no disponible · Toca para reintentar",
+  "swapChartMinMax": "24h  Mín: {minPrice} — Máx: {maxPrice}",
+  "@swapChartMinMax": {
+    "placeholders": {
+      "minPrice": { "type": "String" },
+      "maxPrice": { "type": "String" }
+    }
+  }
 }

lib/l10n/app_fr.arb

@@ -559,5 +559,21 @@
   "requestPaymentReceived": "Paiement reçu",
   "requestDescriptionHint": "Description (facultatif)",
   "universal": "Universel",
-  "copiedToClipboard": "Copié dans le presse-papiers"
+  "copiedToClipboard": "Copié dans le presse-papiers",
+
+  "swap": "Échanger",
+  "swapDescription": "Convertir entre sats et USD",
+  "swapFrom": "De",
+  "swapTo": "Vers",
+  "swapAction": "Échanger",
+  "swapEstimatedFee": "Frais estimés",
+  "swapUseAll": "Tout utiliser",
+  "swapMinimum": "Minimum : {amount}",
+  "swapProcessing": "Swap en cours...",
+  "swapSuccess": "Swap terminé",
+  "swapErrorInsufficient": "Solde insuffisant",
+  "swapErrorExpired": "Le devis a expiré",
+  "swapErrorGeneric": "Erreur de swap : {error}",
+  "swapChartUnavailable": "Prix indisponible · Appuyez pour réessayer",
+  "swapChartMinMax": "24h  Min : {minPrice} — Max : {maxPrice}"
 }

lib/l10n/app_it.arb

@@ -559,5 +559,21 @@
   "requestPaymentReceived": "Pagamento ricevuto",
   "requestDescriptionHint": "Descrizione (opzionale)",
   "universal": "Universale",
-  "copiedToClipboard": "Copiato negli appunti"
+  "copiedToClipboard": "Copiato negli appunti",
+
+  "swap": "Scambia",
+  "swapDescription": "Converti tra sats e USD",
+  "swapFrom": "Da",
+  "swapTo": "A",
+  "swapAction": "Scambia",
+  "swapEstimatedFee": "Commissione stimata",
+  "swapUseAll": "Usa tutto",
+  "swapMinimum": "Minimo: {amount}",
+  "swapProcessing": "Swap in corso...",
+  "swapSuccess": "Swap completato",
+  "swapErrorInsufficient": "Saldo insufficiente",
+  "swapErrorExpired": "Il preventivo è scaduto",
+  "swapErrorGeneric": "Errore swap: {error}",
+  "swapChartUnavailable": "Prezzo non disponibile · Tocca per riprovare",
+  "swapChartMinMax": "24h  Min: {minPrice} — Max: {maxPrice}"
 }

lib/l10n/app_ja.arb

@@ -559,5 +559,21 @@
   "requestPaymentReceived": "支払いを受け取りました",
   "requestDescriptionHint": "説明（任意）",
   "universal": "ユニバーサル",
-  "copiedToClipboard": "クリップボードにコピーしました"
+  "copiedToClipboard": "クリップボードにコピーしました",
+
+  "swap": "交換",
+  "swapDescription": "SatsとUSDを変換",
+  "swapFrom": "送信元",
+  "swapTo": "送信先",
+  "swapAction": "交換",
+  "swapEstimatedFee": "推定手数料",
+  "swapUseAll": "全額使用",
+  "swapMinimum": "最小: {amount}",
+  "swapProcessing": "スワップ処理中...",
+  "swapSuccess": "スワップ完了",
+  "swapErrorInsufficient": "残高不足",
+  "swapErrorExpired": "見積もりの有効期限切れ",
+  "swapErrorGeneric": "スワップエラー: {error}",
+  "swapChartUnavailable": "価格を取得できません・タップで再試行",
+  "swapChartMinMax": "24h  安値: {minPrice} — 高値: {maxPrice}"
 }

lib/l10n/app_ko.arb

@@ -559,5 +559,21 @@
   "requestPaymentReceived": "결제가 수신되었습니다",
   "requestDescriptionHint": "설명 (선택사항)",
   "universal": "유니버설",
-  "copiedToClipboard": "클립보드에 복사되었습니다"
+  "copiedToClipboard": "클립보드에 복사되었습니다",
+
+  "swap": "교환",
+  "swapDescription": "Sats와 USD 간 변환",
+  "swapFrom": "에서",
+  "swapTo": "으로",
+  "swapAction": "교환",
+  "swapEstimatedFee": "예상 수수료",
+  "swapUseAll": "전액 사용",
+  "swapMinimum": "최소: {amount}",
+  "swapProcessing": "교환 처리 중...",
+  "swapSuccess": "교환 완료",
+  "swapErrorInsufficient": "잔액 부족",
+  "swapErrorExpired": "견적이 만료되었습니다",
+  "swapErrorGeneric": "교환 오류: {error}",
+  "swapChartUnavailable": "가격 불러오기 실패 · 탭하여 재시도",
+  "swapChartMinMax": "24h  최저: {minPrice} — 최고: {maxPrice}"
 }

lib/l10n/app_localizations.dart

@@ -2352,6 +2352,96 @@ abstract class L10n {
   /// In es, this message translates to:
   /// **'Copiado al portapapeles'**
   String get copiedToClipboard;
+
+  /// No description provided for @swap.
+  ///
+  /// In es, this message translates to:
+  /// **'Cambiar'**
+  String get swap;
+
+  /// No description provided for @swapDescription.
+  ///
+  /// In es, this message translates to:
+  /// **'Convertir entre sats y USD'**
+  String get swapDescription;
+
+  /// No description provided for @swapFrom.
+  ///
+  /// In es, this message translates to:
+  /// **'De'**
+  String get swapFrom;
+
+  /// No description provided for @swapTo.
+  ///
+  /// In es, this message translates to:
+  /// **'A'**
+  String get swapTo;
+
+  /// No description provided for @swapAction.
+  ///
+  /// In es, this message translates to:
+  /// **'Cambiar'**
+  String get swapAction;
+
+  /// No description provided for @swapEstimatedFee.
+  ///
+  /// In es, this message translates to:
+  /// **'Fee estimado'**
+  String get swapEstimatedFee;
+
+  /// No description provided for @swapUseAll.
+  ///
+  /// In es, this message translates to:
+  /// **'Usar todo'**
+  String get swapUseAll;
+
+  /// No description provided for @swapMinimum.
+  ///
+  /// In es, this message translates to:
+  /// **'Mínimo: {amount}'**
+  String swapMinimum(String amount);
+
+  /// No description provided for @swapProcessing.
+  ///
+  /// In es, this message translates to:
+  /// **'Procesando swap...'**
+  String get swapProcessing;
+
+  /// No description provided for @swapSuccess.
+  ///
+  /// In es, this message translates to:
+  /// **'Swap completado'**
+  String get swapSuccess;
+
+  /// No description provided for @swapErrorInsufficient.
+  ///
+  /// In es, this message translates to:
+  /// **'Saldo insuficiente'**
+  String get swapErrorInsufficient;
+
+  /// No description provided for @swapErrorExpired.
+  ///
+  /// In es, this message translates to:
+  /// **'La cotización ha expirado'**
+  String get swapErrorExpired;
+
+  /// No description provided for @swapErrorGeneric.
+  ///
+  /// In es, this message translates to:
+  /// **'Error en el swap: {error}'**
+  String swapErrorGeneric(String error);
+
+  /// No description provided for @swapChartUnavailable.
+  ///
+  /// In es, this message translates to:
+  /// **'Precio no disponible · Toca para reintentar'**
+  String get swapChartUnavailable;
+
+  /// No description provided for @swapChartMinMax.
+  ///
+  /// In es, this message translates to:
+  /// **'24h  Mín: {minPrice} — Máx: {maxPrice}'**
+  String swapChartMinMax(String minPrice, String maxPrice);
 }
 
 class _L10nDelegate extends LocalizationsDelegate<L10n> {

lib/l10n/app_localizations_de.dart

@@ -1241,4 +1241,56 @@ class L10nDe extends L10n {
 
   @override
   String get copiedToClipboard => 'In die Zwischenablage kopiert';
+
+  @override
+  String get swap => 'Tauschen';
+
+  @override
+  String get swapDescription => 'Zwischen Sats und USD wechseln';
+
+  @override
+  String get swapFrom => 'Von';
+
+  @override
+  String get swapTo => 'Nach';
+
+  @override
+  String get swapAction => 'Tauschen';
+
+  @override
+  String get swapEstimatedFee => 'Geschätzte Gebühr';
+
+  @override
+  String get swapUseAll => 'Alles verwenden';
+
+  @override
+  String swapMinimum(String amount) {
+    return 'Minimum: $amount';
+  }
+
+  @override
+  String get swapProcessing => 'Swap wird verarbeitet...';
+
+  @override
+  String get swapSuccess => 'Swap abgeschlossen';
+
+  @override
+  String get swapErrorInsufficient => 'Unzureichendes Guthaben';
+
+  @override
+  String get swapErrorExpired => 'Angebot abgelaufen';
+
+  @override
+  String swapErrorGeneric(String error) {
+    return 'Swap-Fehler: $error';
+  }
+
+  @override
+  String get swapChartUnavailable =>
+      'Preis nicht verfügbar · Tippen zum Wiederholen';
+
+  @override
+  String swapChartMinMax(String minPrice, String maxPrice) {
+    return '24h  Min: $minPrice — Max: $maxPrice';
+  }
 }

lib/l10n/app_localizations_en.dart

@@ -1222,4 +1222,55 @@ class L10nEn extends L10n {
 
   @override
   String get copiedToClipboard => 'Copied to clipboard';
+
+  @override
+  String get swap => 'Swap';
+
+  @override
+  String get swapDescription => 'Convert between sats and USD';
+
+  @override
+  String get swapFrom => 'From';
+
+  @override
+  String get swapTo => 'To';
+
+  @override
+  String get swapAction => 'Swap';
+
+  @override
+  String get swapEstimatedFee => 'Estimated fee';
+
+  @override
+  String get swapUseAll => 'Use all';
+
+  @override
+  String swapMinimum(String amount) {
+    return 'Minimum: $amount';
+  }
+
+  @override
+  String get swapProcessing => 'Processing swap...';
+
+  @override
+  String get swapSuccess => 'Swap completed';
+
+  @override
+  String get swapErrorInsufficient => 'Insufficient balance';
+
+  @override
+  String get swapErrorExpired => 'Quote has expired';
+
+  @override
+  String swapErrorGeneric(String error) {
+    return 'Swap error: $error';
+  }
+
+  @override
+  String get swapChartUnavailable => 'Price unavailable · Tap to retry';
+
+  @override
+  String swapChartMinMax(String minPrice, String maxPrice) {
+    return '24h  Min: $minPrice — Max: $maxPrice';
+  }
 }

lib/l10n/app_localizations_es.dart

@@ -1230,4 +1230,56 @@ class L10nEs extends L10n {
 
   @override
   String get copiedToClipboard => 'Copiado al portapapeles';
+
+  @override
+  String get swap => 'Cambiar';
+
+  @override
+  String get swapDescription => 'Convertir entre sats y USD';
+
+  @override
+  String get swapFrom => 'De';
+
+  @override
+  String get swapTo => 'A';
+
+  @override
+  String get swapAction => 'Cambiar';
+
+  @override
+  String get swapEstimatedFee => 'Fee estimado';
+
+  @override
+  String get swapUseAll => 'Usar todo';
+
+  @override
+  String swapMinimum(String amount) {
+    return 'Mínimo: $amount';
+  }
+
+  @override
+  String get swapProcessing => 'Procesando swap...';
+
+  @override
+  String get swapSuccess => 'Swap completado';
+
+  @override
+  String get swapErrorInsufficient => 'Saldo insuficiente';
+
+  @override
+  String get swapErrorExpired => 'La cotización ha expirado';
+
+  @override
+  String swapErrorGeneric(String error) {
+    return 'Error en el swap: $error';
+  }
+
+  @override
+  String get swapChartUnavailable =>
+      'Precio no disponible · Toca para reintentar';
+
+  @override
+  String swapChartMinMax(String minPrice, String maxPrice) {
+    return '24h  Mín: $minPrice — Máx: $maxPrice';
+  }
 }

lib/l10n/app_localizations_fr.dart

@@ -1246,4 +1246,56 @@ class L10nFr extends L10n {
 
   @override
   String get copiedToClipboard => 'Copié dans le presse-papiers';
+
+  @override
+  String get swap => 'Échanger';
+
+  @override
+  String get swapDescription => 'Convertir entre sats et USD';
+
+  @override
+  String get swapFrom => 'De';
+
+  @override
+  String get swapTo => 'Vers';
+
+  @override
+  String get swapAction => 'Échanger';
+
+  @override
+  String get swapEstimatedFee => 'Frais estimés';
+
+  @override
+  String get swapUseAll => 'Tout utiliser';
+
+  @override
+  String swapMinimum(String amount) {
+    return 'Minimum : $amount';
+  }
+
+  @override
+  String get swapProcessing => 'Swap en cours...';
+
+  @override
+  String get swapSuccess => 'Swap terminé';
+
+  @override
+  String get swapErrorInsufficient => 'Solde insuffisant';
+
+  @override
+  String get swapErrorExpired => 'Le devis a expiré';
+
+  @override
+  String swapErrorGeneric(String error) {
+    return 'Erreur de swap : $error';
+  }
+
+  @override
+  String get swapChartUnavailable =>
+      'Prix indisponible · Appuyez pour réessayer';
+
+  @override
+  String swapChartMinMax(String minPrice, String maxPrice) {
+    return '24h  Min : $minPrice — Max : $maxPrice';
+  }
 }

lib/l10n/app_localizations_it.dart

@@ -1234,4 +1234,56 @@ class L10nIt extends L10n {
 
   @override
   String get copiedToClipboard => 'Copiato negli appunti';
+
+  @override
+  String get swap => 'Scambia';
+
+  @override
+  String get swapDescription => 'Converti tra sats e USD';
+
+  @override
+  String get swapFrom => 'Da';
+
+  @override
+  String get swapTo => 'A';
+
+  @override
+  String get swapAction => 'Scambia';
+
+  @override
+  String get swapEstimatedFee => 'Commissione stimata';
+
+  @override
+  String get swapUseAll => 'Usa tutto';
+
+  @override
+  String swapMinimum(String amount) {
+    return 'Minimo: $amount';
+  }
+
+  @override
+  String get swapProcessing => 'Swap in corso...';
+
+  @override
+  String get swapSuccess => 'Swap completato';
+
+  @override
+  String get swapErrorInsufficient => 'Saldo insufficiente';
+
+  @override
+  String get swapErrorExpired => 'Il preventivo è scaduto';
+
+  @override
+  String swapErrorGeneric(String error) {
+    return 'Errore swap: $error';
+  }
+
+  @override
+  String get swapChartUnavailable =>
+      'Prezzo non disponibile · Tocca per riprovare';
+
+  @override
+  String swapChartMinMax(String minPrice, String maxPrice) {
+    return '24h  Min: $minPrice — Max: $maxPrice';
+  }
 }

lib/l10n/app_localizations_ja.dart

@@ -1207,4 +1207,55 @@ class L10nJa extends L10n {
 
   @override
   String get copiedToClipboard => 'クリップボードにコピーしました';
+
+  @override
+  String get swap => '交換';
+
+  @override
+  String get swapDescription => 'SatsとUSDを変換';
+
+  @override
+  String get swapFrom => '送信元';
+
+  @override
+  String get swapTo => '送信先';
+
+  @override
+  String get swapAction => '交換';
+
+  @override
+  String get swapEstimatedFee => '推定手数料';
+
+  @override
+  String get swapUseAll => '全額使用';
+
+  @override
+  String swapMinimum(String amount) {
+    return '最小: $amount';
+  }
+
+  @override
+  String get swapProcessing => 'スワップ処理中...';
+
+  @override
+  String get swapSuccess => 'スワップ完了';
+
+  @override
+  String get swapErrorInsufficient => '残高不足';
+
+  @override
+  String get swapErrorExpired => '見積もりの有効期限切れ';
+
+  @override
+  String swapErrorGeneric(String error) {
+    return 'スワップエラー: $error';
+  }
+
+  @override
+  String get swapChartUnavailable => '価格を取得できません・タップで再試行';
+
+  @override
+  String swapChartMinMax(String minPrice, String maxPrice) {
+    return '24h  安値: $minPrice — 高値: $maxPrice';
+  }
 }

lib/l10n/app_localizations_ko.dart

@@ -1209,4 +1209,55 @@ class L10nKo extends L10n {
 
   @override
   String get copiedToClipboard => '클립보드에 복사되었습니다';
+
+  @override
+  String get swap => '교환';
+
+  @override
+  String get swapDescription => 'Sats와 USD 간 변환';
+
+  @override
+  String get swapFrom => '에서';
+
+  @override
+  String get swapTo => '으로';
+
+  @override
+  String get swapAction => '교환';
+
+  @override
+  String get swapEstimatedFee => '예상 수수료';
+
+  @override
+  String get swapUseAll => '전액 사용';
+
+  @override
+  String swapMinimum(String amount) {
+    return '최소: $amount';
+  }
+
+  @override
+  String get swapProcessing => '교환 처리 중...';
+
+  @override
+  String get swapSuccess => '교환 완료';
+
+  @override
+  String get swapErrorInsufficient => '잔액 부족';
+
+  @override
+  String get swapErrorExpired => '견적이 만료되었습니다';
+
+  @override
+  String swapErrorGeneric(String error) {
+    return '교환 오류: $error';
+  }
+
+  @override
+  String get swapChartUnavailable => '가격 불러오기 실패 · 탭하여 재시도';
+
+  @override
+  String swapChartMinMax(String minPrice, String maxPrice) {
+    return '24h  최저: $minPrice — 최고: $maxPrice';
+  }
 }

lib/l10n/app_localizations_pt.dart

@@ -1234,4 +1234,56 @@ class L10nPt extends L10n {
 
   @override
   String get copiedToClipboard => 'Copiado para a área de transferência';
+
+  @override
+  String get swap => 'Trocar';
+
+  @override
+  String get swapDescription => 'Converter entre sats e USD';
+
+  @override
+  String get swapFrom => 'De';
+
+  @override
+  String get swapTo => 'Para';
+
+  @override
+  String get swapAction => 'Trocar';
+
+  @override
+  String get swapEstimatedFee => 'Taxa estimada';
+
+  @override
+  String get swapUseAll => 'Usar tudo';
+
+  @override
+  String swapMinimum(String amount) {
+    return 'Mínimo: $amount';
+  }
+
+  @override
+  String get swapProcessing => 'Processando swap...';
+
+  @override
+  String get swapSuccess => 'Swap concluído';
+
+  @override
+  String get swapErrorInsufficient => 'Saldo insuficiente';
+
+  @override
+  String get swapErrorExpired => 'A cotação expirou';
+
+  @override
+  String swapErrorGeneric(String error) {
+    return 'Erro no swap: $error';
+  }
+
+  @override
+  String get swapChartUnavailable =>
+      'Preço indisponível · Toque para tentar novamente';
+
+  @override
+  String swapChartMinMax(String minPrice, String maxPrice) {
+    return '24h  Mín: $minPrice — Máx: $maxPrice';
+  }
 }

lib/l10n/app_localizations_ru.dart

@@ -1230,4 +1230,55 @@ class L10nRu extends L10n {
 
   @override
   String get copiedToClipboard => 'Скопировано в буфер обмена';
+
+  @override
+  String get swap => 'Обменять';
+
+  @override
+  String get swapDescription => 'Конвертировать между sats и USD';
+
+  @override
+  String get swapFrom => 'Из';
+
+  @override
+  String get swapTo => 'В';
+
+  @override
+  String get swapAction => 'Обменять';
+
+  @override
+  String get swapEstimatedFee => 'Ориентировочная комиссия';
+
+  @override
+  String get swapUseAll => 'Использовать всё';
+
+  @override
+  String swapMinimum(String amount) {
+    return 'Минимум: $amount';
+  }
+
+  @override
+  String get swapProcessing => 'Обработка обмена...';
+
+  @override
+  String get swapSuccess => 'Обмен завершён';
+
+  @override
+  String get swapErrorInsufficient => 'Недостаточный баланс';
+
+  @override
+  String get swapErrorExpired => 'Котировка истекла';
+
+  @override
+  String swapErrorGeneric(String error) {
+    return 'Ошибка обмена: $error';
+  }
+
+  @override
+  String get swapChartUnavailable => 'Цена недоступна · Нажмите для повтора';
+
+  @override
+  String swapChartMinMax(String minPrice, String maxPrice) {
+    return '24h  Мин: $minPrice — Макс: $maxPrice';
+  }
 }

lib/l10n/app_localizations_sw.dart

@@ -1231,4 +1231,55 @@ class L10nSw extends L10n {
 
   @override
   String get copiedToClipboard => 'Imenakiliwa kwenye ubao wa kunakili';
+
+  @override
+  String get swap => 'Badilisha';
+
+  @override
+  String get swapDescription => 'Badilisha kati ya sats na USD';
+
+  @override
+  String get swapFrom => 'Kutoka';
+
+  @override
+  String get swapTo => 'Kwenda';
+
+  @override
+  String get swapAction => 'Badilisha';
+
+  @override
+  String get swapEstimatedFee => 'Ada inayokadiriwa';
+
+  @override
+  String get swapUseAll => 'Tumia yote';
+
+  @override
+  String swapMinimum(String amount) {
+    return 'Kiwango cha chini: $amount';
+  }
+
+  @override
+  String get swapProcessing => 'Inashughulikia ubadilishaji...';
+
+  @override
+  String get swapSuccess => 'Ubadilishaji umekamilika';
+
+  @override
+  String get swapErrorInsufficient => 'Salio haitoshi';
+
+  @override
+  String get swapErrorExpired => 'Bei imeisha muda';
+
+  @override
+  String swapErrorGeneric(String error) {
+    return 'Kosa la ubadilishaji: $error';
+  }
+
+  @override
+  String get swapChartUnavailable => 'Bei haipatikani · Gusa kurudia';
+
+  @override
+  String swapChartMinMax(String minPrice, String maxPrice) {
+    return '24h  Chini: $minPrice — Juu: $maxPrice';
+  }
 }

lib/l10n/app_localizations_zh.dart

@@ -1202,4 +1202,55 @@ class L10nZh extends L10n {
 
   @override
   String get copiedToClipboard => '已复制到剪贴板';
+
+  @override
+  String get swap => '兑换';
+
+  @override
+  String get swapDescription => '在 Sats 和 USD 之间转换';
+
+  @override
+  String get swapFrom => '从';
+
+  @override
+  String get swapTo => '到';
+
+  @override
+  String get swapAction => '兑换';
+
+  @override
+  String get swapEstimatedFee => '预估手续费';
+
+  @override
+  String get swapUseAll => '全部使用';
+
+  @override
+  String swapMinimum(String amount) {
+    return '最低: $amount';
+  }
+
+  @override
+  String get swapProcessing => '兑换处理中...';
+
+  @override
+  String get swapSuccess => '兑换完成';
+
+  @override
+  String get swapErrorInsufficient => '余额不足';
+
+  @override
+  String get swapErrorExpired => '报价已过期';
+
+  @override
+  String swapErrorGeneric(String error) {
+    return '兑换错误: $error';
+  }
+
+  @override
+  String get swapChartUnavailable => '价格不可用 · 点击重试';
+
+  @override
+  String swapChartMinMax(String minPrice, String maxPrice) {
+    return '24h  最低: $minPrice — 最高: $maxPrice';
+  }
 }

lib/l10n/app_pt.arb

@@ -559,5 +559,21 @@
   "requestPaymentReceived": "Pagamento recebido",
   "requestDescriptionHint": "Descrição (opcional)",
   "universal": "Universal",
-  "copiedToClipboard": "Copiado para a área de transferência"
+  "copiedToClipboard": "Copiado para a área de transferência",
+
+  "swap": "Trocar",
+  "swapDescription": "Converter entre sats e USD",
+  "swapFrom": "De",
+  "swapTo": "Para",
+  "swapAction": "Trocar",
+  "swapEstimatedFee": "Taxa estimada",
+  "swapUseAll": "Usar tudo",
+  "swapMinimum": "Mínimo: {amount}",
+  "swapProcessing": "Processando swap...",
+  "swapSuccess": "Swap concluído",
+  "swapErrorInsufficient": "Saldo insuficiente",
+  "swapErrorExpired": "A cotação expirou",
+  "swapErrorGeneric": "Erro no swap: {error}",
+  "swapChartUnavailable": "Preço indisponível · Toque para tentar novamente",
+  "swapChartMinMax": "24h  Mín: {minPrice} — Máx: {maxPrice}"
 }

lib/l10n/app_ru.arb

@@ -559,5 +559,21 @@
   "requestPaymentReceived": "Платёж получен",
   "requestDescriptionHint": "Описание (необязательно)",
   "universal": "Универсальный",
-  "copiedToClipboard": "Скопировано в буфер обмена"
+  "copiedToClipboard": "Скопировано в буфер обмена",
+
+  "swap": "Обменять",
+  "swapDescription": "Конвертировать между sats и USD",
+  "swapFrom": "Из",
+  "swapTo": "В",
+  "swapAction": "Обменять",
+  "swapEstimatedFee": "Ориентировочная комиссия",
+  "swapUseAll": "Использовать всё",
+  "swapMinimum": "Минимум: {amount}",
+  "swapProcessing": "Обработка обмена...",
+  "swapSuccess": "Обмен завершён",
+  "swapErrorInsufficient": "Недостаточный баланс",
+  "swapErrorExpired": "Котировка истекла",
+  "swapErrorGeneric": "Ошибка обмена: {error}",
+  "swapChartUnavailable": "Цена недоступна · Нажмите для повтора",
+  "swapChartMinMax": "24h  Мин: {minPrice} — Макс: {maxPrice}"
 }

lib/l10n/app_sw.arb

@@ -559,5 +559,21 @@
   "requestPaymentReceived": "Malipo limepokelewa",
   "requestDescriptionHint": "Maelezo (si lazima)",
   "universal": "Universal",
-  "copiedToClipboard": "Imenakiliwa kwenye ubao wa kunakili"
+  "copiedToClipboard": "Imenakiliwa kwenye ubao wa kunakili",
+
+  "swap": "Badilisha",
+  "swapDescription": "Badilisha kati ya sats na USD",
+  "swapFrom": "Kutoka",
+  "swapTo": "Kwenda",
+  "swapAction": "Badilisha",
+  "swapEstimatedFee": "Ada inayokadiriwa",
+  "swapUseAll": "Tumia yote",
+  "swapMinimum": "Kiwango cha chini: {amount}",
+  "swapProcessing": "Inashughulikia ubadilishaji...",
+  "swapSuccess": "Ubadilishaji umekamilika",
+  "swapErrorInsufficient": "Salio haitoshi",
+  "swapErrorExpired": "Bei imeisha muda",
+  "swapErrorGeneric": "Kosa la ubadilishaji: {error}",
+  "swapChartUnavailable": "Bei haipatikani · Gusa kurudia",
+  "swapChartMinMax": "24h  Chini: {minPrice} — Juu: {maxPrice}"
 }

lib/l10n/app_zh.arb

@@ -559,5 +559,21 @@
   "requestPaymentReceived": "已收到付款",
   "requestDescriptionHint": "描述（可选）",
   "universal": "通用",
-  "copiedToClipboard": "已复制到剪贴板"
+  "copiedToClipboard": "已复制到剪贴板",
+
+  "swap": "兑换",
+  "swapDescription": "在 Sats 和 USD 之间转换",
+  "swapFrom": "从",
+  "swapTo": "到",
+  "swapAction": "兑换",
+  "swapEstimatedFee": "预估手续费",
+  "swapUseAll": "全部使用",
+  "swapMinimum": "最低: {amount}",
+  "swapProcessing": "兑换处理中...",
+  "swapSuccess": "兑换完成",
+  "swapErrorInsufficient": "余额不足",
+  "swapErrorExpired": "报价已过期",
+  "swapErrorGeneric": "兑换错误: {error}",
+  "swapChartUnavailable": "价格不可用 · 点击重试",
+  "swapChartMinMax": "24h  最低: {minPrice} — 最高: {maxPrice}"
 }

lib/providers/wallet_provider.dart

@@ -1537,6 +1537,58 @@ class WalletProvider extends ChangeNotifier {
     }
   }
 
+  /// Guarda metadata para el lado melt (enviado) de un swap.
+  /// Busca la tx outgoing más reciente que coincida con el monto.
+  Future<void> saveSwapMeltMetadata(Wallet wallet, String invoice, BigInt amount) async {
+    try {
+      final txs = await wallet.listTransactions(
+        direction: TransactionDirection.outgoing,
+      );
+      final tx = txs.cast<Transaction?>().firstWhere(
+        (t) => t!.amount == amount && !_txMetaStorage.has(t.id),
+        orElse: () => null,
+      );
+      if (tx != null) {
+        await _txMetaStorage.save(
+          tx.id,
+          TransactionMeta(type: TransactionType.lightning, invoice: invoice),
+        );
+        debugPrint('Swap melt metadata guardada para tx ${tx.id}');
+      } else {
+        debugPrint('No matching untagged outgoing tx found for amount $amount');
+      }
+    } catch (e) {
+      debugPrint('Error guardando swap melt metadata: $e');
+    }
+    notifyListeners();
+  }
+
+  /// Guarda metadata para el lado mint (recibido) de un swap.
+  /// Busca la tx incoming más reciente que coincida con el monto.
+  Future<void> saveSwapMintMetadata(Wallet wallet, String invoice, BigInt amount) async {
+    try {
+      final txs = await wallet.listTransactions(
+        direction: TransactionDirection.incoming,
+      );
+      final tx = txs.cast<Transaction?>().firstWhere(
+        (t) => t!.amount == amount && !_txMetaStorage.has(t.id),
+        orElse: () => null,
+      );
+      if (tx != null) {
+        await _txMetaStorage.save(
+          tx.id,
+          TransactionMeta(type: TransactionType.lightning, invoice: invoice),
+        );
+        debugPrint('Swap mint metadata guardada para tx ${tx.id}');
+      } else {
+        debugPrint('No matching untagged incoming tx found for amount $amount');
+      }
+    } catch (e) {
+      debugPrint('Error guardando swap mint metadata: $e');
+    }
+    notifyListeners();
+  }
+
   // ============================================================
   // HISTORIAL
   // ============================================================

lib/screens/8_settings/settings_screen.dart

@@ -15,6 +15,7 @@ import '../2_onboarding/backup_seed_screen.dart';
 import 'mints_screen.dart';
 import 'language_screen.dart';
 import 'p2pk_keys_screen.dart';
+import '../13_swap/swap_screen.dart';
 
 /// Pantalla de configuración
 class SettingsScreen extends StatefulWidget {
@@ -77,6 +78,19 @@ class _SettingsScreenState extends State<SettingsScreen> {
                     // Sección WALLET
                     _buildSectionHeader(l10n.walletSection),
                     const SizedBox(height: AppDimensions.paddingSmall),
+                    _buildSettingTile(
+                      icon: LucideIcons.arrowLeftRight,
+                      title: l10n.swap,
+                      subtitle: l10n.swapDescription,
+                      onTap: () {
+                        Navigator.push(
+                          context,
+                          MaterialPageRoute(
+                            builder: (context) => const SwapScreen(),
+                          ),
+                        );
+                      },
+                    ),
                     _buildSettingTile(
                       icon: LucideIcons.key,
                       title: l10n.backupSeedPhrase,
@@ -110,7 +124,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
                       ),
                     ),
                     _buildSettingTile(
-                      icon: LucideIcons.refreshCw,
+                      icon: LucideIcons.searchCode,
                       title: l10n.recoverTokens,
                       subtitle: l10n.scanMintsWithSeed,
                       onTap: () => _showRecoverTokensDialog(context, settingsProvider),

rust/Cargo.lock

@@ -367,6 +367,17 @@ version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2dee39a0ee5b4095224a0cfc6bf4cc1baf0f9624b96b367e53b66d974e51d953"
 
+[[package]]
+name = "bitcoin-payment-instructions"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c300c948b2ff78c965ea3a613372352125448a22f1acf49e95e3878149824091"
+dependencies = [
+ "bitcoin",
+ "lightning",
+ "lightning-invoice",
+]
+
 [[package]]
 name = "bitcoin-private"
 version = "0.1.0"
@@ -489,9 +500,9 @@ checksum = "1e748733b7cbc798e1434b6ac524f0c1ff2ab456fe201501e6497c8417a4fc33"
 
 [[package]]
 name = "cashu"
-version = "0.15.1"
+version = "0.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0d612261d61069314bb0e39adbd63d0fd3bd22084f332e85c98e615c15f24e5a"
+checksum = "26b4ad04070fb67914feb2641e7b54001000f1f7f67a7c39a08f32edf01fd3ae"
 dependencies = [
  "bitcoin",
  "cbor-diag",
@@ -507,6 +518,7 @@ dependencies = [
  "strum_macros",
  "thiserror 2.0.18",
  "tracing",
+ "unicode-normalization",
  "url",
  "uuid",
  "web-time",
@@ -555,14 +567,15 @@ dependencies = [
 
 [[package]]
 name = "cdk"
-version = "0.15.1"
+version = "0.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d8955437beea95ee6849c6eab59012760a7589e6eeff4d6e36ebf324c641388d"
+checksum = "c6536eb1df7a497cb334edf6bb9eea1fa8e4a9b08c79fe45c40d43413ecb88c8"
 dependencies = [
  "anyhow",
  "arc-swap",
  "async-trait",
  "bitcoin",
+ "bitcoin-payment-instructions",
  "cbor-diag",
  "cdk-common",
  "cdk-signatory",
@@ -582,7 +595,6 @@ dependencies = [
  "serde_with",
  "thiserror 2.0.18",
  "tokio",
- "tokio-tungstenite",
  "tokio-util",
  "tracing",
  "url",
@@ -593,9 +605,9 @@ dependencies = [
 
 [[package]]
 name = "cdk-common"
-version = "0.15.1"
+version = "0.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f5bf771d3780d2321211eb575e1f8341cec50f8a16c4f50b2787807b5090a38"
+checksum = "a371d218ffe83dcabd202278251af53744b8fa3e846124ddcd34247c4e38bdc3"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -606,6 +618,7 @@ dependencies = [
  "ciborium",
  "futures",
  "getrandom 0.2.17",
+ "jsonwebtoken",
  "lightning",
  "lightning-invoice",
  "parking_lot",
@@ -626,23 +639,31 @@ dependencies = [
 
 [[package]]
 name = "cdk-http-client"
-version = "0.15.1"
+version = "0.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b58f47c4af4a4c862d145863211f5454c3ccfbacaaef9e4913276519a1ac498e"
+checksum = "bf194792d45975b360911417d3713e4d3f0142e18b082e2a8c2c88a91630b43d"
 dependencies = [
+ "futures",
+ "futures-channel",
+ "js-sys",
  "regex",
  "reqwest",
  "serde",
  "serde_json",
  "thiserror 2.0.18",
+ "tokio-tungstenite",
+ "tracing",
  "url",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "web-sys",
 ]
 
 [[package]]
 name = "cdk-signatory"
-version = "0.15.1"
+version = "0.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dc1dca3b84999ac0e6fd15330d566aff6df6082a349134fd884deef8c9eeb570"
+checksum = "4f40745c9402049bbba47ae52e1fc7552d4af8e99572fd73697448f51bbb3a02"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -662,9 +683,9 @@ dependencies = [
 
 [[package]]
 name = "cdk-sql-common"
-version = "0.15.1"
+version = "0.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6625a8248a43fbebb92cc57f1b09c453d5de94d62a512b62e9a62b25d0dd5506"
+checksum = "36e920cffaa36f396d16727649b05d6dc8d42aecc4108fa955876515149bdb0e"
 dependencies = [
  "async-trait",
  "bitcoin",
@@ -681,9 +702,9 @@ dependencies = [
 
 [[package]]
 name = "cdk-sqlite"
-version = "0.15.1"
+version = "0.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9334877fe3f9fb25f6819c0876af1b0690f47aa2b1e548a20ac904740cbd574c"
+checksum = "c706b86b76d89bbbfad7e106328c14f1d99440ee5829840510e50922f48fdc51"
 dependencies = [
  "async-trait",
  "bitcoin",
@@ -1054,6 +1075,9 @@ name = "dnssec-prover"
 version = "0.6.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec4f825369fc7134da70ca4040fddc8e03b80a46d249ae38d9c1c39b7b4476bf"
+dependencies = [
+ "bitcoin_hashes 0.14.1",
+]
 
 [[package]]
 name = "dyn-clone"

rust/Cargo.toml

@@ -8,9 +8,9 @@ crate-type = ["cdylib", "staticlib"]
 
 [dependencies]
 # Cashu — acceso directo, sin intermediarios
-cdk = { version = "0.15.1", default-features = false, features = ["wallet", "nostr"] }
-cdk-common = { version = "0.15.1", default-features = false, features = ["nostr"] }
-cdk-sqlite = { version = "0.15.1", default-features = false, features = ["wallet"] }
+cdk = { version = "0.16.0", default-features = false, features = ["wallet", "nostr"] }
+cdk-common = { version = "0.16.0", default-features = false, features = ["nostr"] }
+cdk-sqlite = { version = "0.16.0", default-features = false, features = ["wallet"] }
 
 # Bridge Flutter <-> Rust
 flutter_rust_bridge = { version = "=2.11.1", default-features = false, features = [
@@ -31,7 +31,7 @@ bip39 = { version = "2.1", default-features = false, features = ["std"] }
 # Entropy
 getrandom = { version = "0.3", default-features = false, features = ["std"] }
 
-# Nostr keys (same version as CDK 0.15.1 — CDK does not re-export Keys)
+# Nostr keys (same version as CDK 0.16.0 — CDK does not re-export Keys)
 nostr-sdk = { version = "0.44.1", default-features = false, features = ["nip04", "nip44", "nip59"] }
 
 # Async runtime

rust/src/api/payment_request.rs

@@ -69,16 +69,7 @@ fn parse_payment_request_inner(encoded: String) -> Result<PaymentRequestInfo, Er
     let pr = CdkPaymentRequest::from_str(&creq_str)
         .map_err(|e| Error::Cdk(format!("Invalid payment request: {e}")))?;
 
-    let mints: Vec<String> = match &pr.mints {
-        Some(list) => {
-            let mut v = Vec::new();
-            for m in list {
-                v.push(format!("{}", m));
-            }
-            v
-        }
-        None => Vec::new(),
-    };
+    let mints: Vec<String> = pr.mints.iter().map(|m| m.to_string()).collect();
     let mut transports = Vec::new();
     for t in &pr.transports {
         transports.push(TransportInfo {
@@ -320,7 +311,7 @@ impl Wallet {
         let nostr_transport = Transport {
             _type: TransportType::Nostr,
             target: nprofile_bech32,
-            tags: Some(vec![vec!["n".to_string(), "17".to_string()]]),
+            tags: vec![vec!["n".to_string(), "17".to_string()]],
         };
 
         // Build the PaymentRequest with this wallet's mint and unit
@@ -336,7 +327,7 @@ impl Wallet {
             amount: params.amount.map(Amount::from),
             unit: Some(unit.clone()),
             single_use: Some(true),
-            mints: Some(vec![mint_url.clone()]),
+            mints: vec![mint_url.clone()],
             description: params.description,
             transports: vec![nostr_transport],
             nut10: None,

rust/src/api/wallet.rs

@@ -155,7 +155,7 @@ impl Wallet {
         // Compute the deterministic transaction ID from the token's proofs
         // (SHA-256 of sorted Y values — same as CDK uses internally)
         // Best-effort: send is already committed, don't fail on ID computation
-        let tx_id = match self.inner.get_mint_keysets().await {
+        let tx_id = match self.inner.get_mint_keysets(cdk::wallet::KeysetFilter::Active).await {
             Ok(keysets) => match cdk_token.proofs(&keysets) {
                 Ok(proofs) => TransactionId::try_from(proofs)
                     .map(|id| id.to_string())
@@ -528,7 +528,7 @@ impl Wallet {
 
     pub async fn is_token_spent(&self, token: Token) -> Result<bool, Error> {
         let token: CdkToken = token.try_into()?;
-        let mint_keysets = self.inner.get_mint_keysets().await?;
+        let mint_keysets = self.inner.get_mint_keysets(cdk::wallet::KeysetFilter::All).await?;
         let proof_states = self
             .inner
             .check_proofs_spent(token.proofs(&mint_keysets)?)