apps/backend/prisma/migrations/20260617131039_add_wallet_is_default/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "wallets" ADD COLUMN     "isDefault" BOOLEAN NOT NULL DEFAULT false;

apps/backend/prisma/schema.prisma

@@ -134,6 +134,7 @@ model Wallet {
   name      String    @db.VarChar(100)
   currency  String    @db.VarChar(10)
   balance   Decimal   @db.Decimal(14, 4)
+  isDefault Boolean   @default(false)
   createdAt DateTime  @default(now())
   updatedAt DateTime  @updatedAt
 

apps/backend/src/modules/expenses/expenses.service.ts

@@ -1,5 +1,5 @@
 import { z } from "zod";
-import { PaymentStatus, QuoteType, Prisma } from "../../generated/prisma/client";
+import { PaymentStatus, QuoteType, type Prisma } from "../../generated/prisma/client";
 import { cache } from "../../lib/cache";
 import { prisma } from "../../lib/prisma";
 import { roundTo } from "../../lib/utils";
@@ -17,11 +17,15 @@ export const createNonPeriodicExpenseSchema = z.object({
   description: z.string().min(1).max(50),
   amount: z.number().positive(),
   dueDate: z.string().datetime(),
+  walletId: z.number().int().positive(),
+  usdcConversionRate: z.number().positive().optional(),
 });
 
 export const payExpenseSchema = z.object({
   amountPayed: z.number().positive(),
   paymentDate: z.string().datetime().optional(),
+  walletId: z.number().int().positive(),
+  usdcConversionRate: z.number().positive().optional(),
 });
 
 export const updateExpenseSchema = z.object({
@@ -226,10 +230,27 @@ export async function createNonPeriodicExpense(
   const year = dueDate.getUTCFullYear();
   const month = dueDate.getUTCMonth() + 1;
 
-  const belo = await getBeloSellPriceForDate(dueDate);
+  const wallet = await prisma.wallet.findUnique({
+    where: { id: data.walletId },
+  });
+  if (!wallet) {
+    throw new Error("Billetera no encontrada");
+  }
 
-  const result = await prisma.expense.create({
+  const isUSDC = wallet.currency === "USDC";
-    data: {
+
+  if (isUSDC && !data.usdcConversionRate) {
+    throw new Error("La tasa de conversión es obligatoria para billeteras USDC");
+  }
+
+  const belo = isUSDC ? null : await getBeloSellPriceForDate(dueDate);
+
+  const movementAmount =
+    isUSDC && data.usdcConversionRate
+      ? -roundTo(data.amount / data.usdcConversionRate, 4)
+      : -data.amount;
+
+  const expenseData: Prisma.ExpenseUncheckedCreateInput = {
     description: data.description,
     amount: data.amount,
     amountPayed: data.amount,
@@ -238,11 +259,35 @@ export async function createNonPeriodicExpense(
     year,
     month,
     status: PaymentStatus.PAYED,
-      ...(belo !== null
+  };
-        ? { beloPrice: belo, usdcEquivalent: roundTo(data.amount / belo, 6) }
+
-        : {}),
+  if (isUSDC && data.usdcConversionRate) {
+    expenseData.beloPrice = data.usdcConversionRate;
+    expenseData.usdcEquivalent = roundTo(
+      data.amount / data.usdcConversionRate,
+      6,
+    );
+  } else if (belo !== null) {
+    expenseData.beloPrice = belo;
+    expenseData.usdcEquivalent = roundTo(data.amount / belo, 6);
+  }
+
+  const [result] = await prisma.$transaction([
+    prisma.expense.create({ data: expenseData }),
+    prisma.wallet.update({
+      where: { id: data.walletId },
+      data: { balance: { increment: movementAmount } },
+    }),
+    prisma.walletMovement.create({
+      data: {
+        walletId: data.walletId,
+        type: "WITHDRAWAL",
+        amount: movementAmount,
+        description: `Pago: ${data.description}`,
       },
-  });
+    }),
+  ]);
+
   cache.invalidateByPrefix("expenses:");
   return result;
 }
@@ -251,23 +296,61 @@ export async function payExpense(
   id: number,
   data: z.infer<typeof payExpenseSchema>,
 ) {
+  const expense = await prisma.expense.findUniqueOrThrow({ where: { id } });
+
   const paymentDate = data.paymentDate
     ? new Date(data.paymentDate)
     : new Date();
 
-  const belo = await getBeloSellPriceForDate(paymentDate);
+  const wallet = await prisma.wallet.findUnique({
+    where: { id: data.walletId },
+  });
+  if (!wallet) {
+    throw new Error("Billetera no encontrada");
+  }
 
-  const result = await prisma.expense.update({
+  const isUSDC = wallet.currency === "USDC";
-    where: { id },
+
-    data: {
+  if (isUSDC && !data.usdcConversionRate) {
+    throw new Error("La tasa de conversión es obligatoria para billeteras USDC");
+  }
+
+  const belo = isUSDC ? null : await getBeloSellPriceForDate(paymentDate);
+
+  const movementAmount = isUSDC && data.usdcConversionRate
+    ? -roundTo(data.amountPayed / data.usdcConversionRate, 4)
+    : -data.amountPayed;
+
+  const expenseUpdateData: Prisma.ExpenseUncheckedUpdateInput = {
     status: PaymentStatus.PAYED,
     amountPayed: data.amountPayed,
     paymentDate,
-      ...(belo !== null
+  };
-        ? { beloPrice: belo, usdcEquivalent: roundTo(data.amountPayed / belo, 6) }
+
-        : {}),
+  if (isUSDC && data.usdcConversionRate) {
+    expenseUpdateData.beloPrice = data.usdcConversionRate;
+    expenseUpdateData.usdcEquivalent = roundTo(data.amountPayed / data.usdcConversionRate, 6);
+  } else if (belo !== null) {
+    expenseUpdateData.beloPrice = belo;
+    expenseUpdateData.usdcEquivalent = roundTo(data.amountPayed / belo, 6);
+  }
+
+  const [result] = await prisma.$transaction([
+    prisma.expense.update({ where: { id }, data: expenseUpdateData }),
+    prisma.wallet.update({
+      where: { id: data.walletId },
+      data: { balance: { increment: movementAmount } },
+    }),
+    prisma.walletMovement.create({
+      data: {
+        walletId: data.walletId,
+        type: "WITHDRAWAL",
+        amount: movementAmount,
+        description: `Pago: ${expense.description}`,
       },
-  });
+    }),
+  ]);
+
   cache.invalidateByPrefix("expenses:");
   return result;
 }

apps/backend/src/modules/wallets/handlers/setDefaultWallet.ts

@@ -0,0 +1,8 @@
+import type { Context } from "hono";
+import { setDefaultWallet } from "../wallets.service";
+
+export async function setDefaultWalletHandler(c: Context) {
+  const id = Number(c.req.param("id"));
+  const result = await setDefaultWallet(id);
+  return c.json(result);
+}

apps/backend/src/modules/wallets/wallets.routes.ts

@@ -7,6 +7,7 @@ import { listMovementsHandler } from "./handlers/listMovements";
 import { listWalletsHandler } from "./handlers/listWallets";
 import { transferWalletHandler } from "./handlers/transferWallet";
 import { updateWalletHandler } from "./handlers/updateWallet";
+import { setDefaultWalletHandler } from "./handlers/setDefaultWallet";
 
 const app = new Hono();
 
@@ -17,6 +18,7 @@ app.delete("/:id", deleteWalletHandler);
 app.post("/:id/deposit", depositWalletHandler);
 app.post("/:id/adjust", adjustBalanceHandler);
 app.post("/transfer", transferWalletHandler);
+app.put("/:id/default", setDefaultWalletHandler);
 app.get("/:id/movements", listMovementsHandler);
 
 export default app;

apps/backend/src/modules/wallets/wallets.service.ts

@@ -6,6 +6,7 @@ export const createWalletSchema = z.object({
   name: z.string().min(1).max(100),
   currency: z.string().min(1).max(10),
   initialBalance: z.number().optional().default(0),
+  isDefault: z.boolean().optional().default(false),
 });
 
 export const updateWalletSchema = z.object({
@@ -13,6 +14,10 @@ export const updateWalletSchema = z.object({
   currency: z.string().min(1).max(10),
 });
 
+export const setDefaultWalletSchema = z.object({
+  walletId: z.number().int().positive(),
+});
+
 export const depositSchema = z.object({
   amount: z.number().positive(),
   description: z.string().max(255).optional(),
@@ -36,9 +41,12 @@ export type UpdateWalletInput = z.infer<typeof updateWalletSchema>;
 export type DepositInput = z.infer<typeof depositSchema>;
 export type AdjustBalanceInput = z.infer<typeof adjustBalanceSchema>;
 export type TransferInput = z.infer<typeof transferSchema>;
+export type SetDefaultWalletInput = z.infer<typeof setDefaultWalletSchema>;
 
 export async function listWallets() {
-  const wallets = await prisma.wallet.findMany({ orderBy: { createdAt: "desc" } });
+  const wallets = await prisma.wallet.findMany({
+    orderBy: [{ isDefault: "desc" }, { createdAt: "desc" }],
+  });
   return wallets.map((w) => ({ ...w, balance: Number(w.balance) }));
 }
 
@@ -48,8 +56,15 @@ export async function createWallet(input: CreateWalletInput) {
       name: input.name,
       currency: input.currency,
       balance: input.initialBalance ?? 0,
+      isDefault: input.isDefault ?? false,
     },
   });
+  if (wallet.isDefault) {
+    await prisma.wallet.updateMany({
+      where: { id: { not: wallet.id }, isDefault: true },
+      data: { isDefault: false },
+    });
+  }
   return { ...wallet, balance: Number(wallet.balance) };
 }
 
@@ -155,6 +170,21 @@ export async function transferWallet(input: TransferInput) {
   };
 }
 
+export async function setDefaultWallet(walletId: number) {
+  await prisma.$transaction([
+    prisma.wallet.updateMany({
+      where: { isDefault: true },
+      data: { isDefault: false },
+    }),
+    prisma.wallet.update({
+      where: { id: walletId },
+      data: { isDefault: true },
+    }),
+  ]);
+  const wallet = await prisma.wallet.findUniqueOrThrow({ where: { id: walletId } });
+  return { ...wallet, balance: Number(wallet.balance) };
+}
+
 export async function listMovements(walletId: number) {
   const movements = await prisma.walletMovement.findMany({
     where: { walletId },

apps/frontend/src/features/expenses/components/NewExpenseDialog.tsx

@@ -1,5 +1,6 @@
 import { zodResolver } from "@hookform/resolvers/zod";
-import { Controller, useForm } from "react-hook-form";
+import { useEffect, useMemo, useRef } from "react";
+import { Controller, useForm, useWatch } from "react-hook-form";
 import { z } from "zod";
 import { Button } from "@/components/ui/button";
 import { DatePicker } from "@/components/ui/date-picker";
@@ -10,7 +11,15 @@ import {
   ResponsiveDialogHeader,
   ResponsiveDialogTitle,
 } from "@/components/ui/responsive-dialog";
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@/components/ui/select";
 import { useExpensesContext } from "../ExpensesProvider";
+import { useQuotes, useWallets } from "@/lib/queries";
 
 const newExpenseSchema = z.object({
   description: z
@@ -19,6 +28,11 @@ const newExpenseSchema = z.object({
     .max(50, "Máximo 50 caracteres"),
   amount: z.number().positive("El monto debe ser mayor a 0"),
   dueDate: z.date({ message: "La fecha es obligatoria" }),
+  walletId: z.number().positive("Seleccioná una billetera"),
+  usdcConversionRate: z
+    .number()
+    .positive("La cotización debe ser mayor a 0")
+    .optional(),
 });
 
 type NewExpenseFormValues = z.infer<typeof newExpenseSchema>;
@@ -33,6 +47,19 @@ export function NewExpenseDialog({
   onOpenChange,
 }: NewExpenseDialogProps) {
   const { createNonPeriodicExpense } = useExpensesContext();
+  const prevWalletRef = useRef(0);
+  const { data: wallets } = useWallets();
+  const { data: quotes } = useQuotes();
+  const defaultWallet = useMemo(
+    () => wallets?.find((w) => w.isDefault),
+    [wallets],
+  );
+
+  const beloSell = useMemo(() => {
+    if (!quotes) return null;
+    const belo = quotes.find((q) => q.type === "BELO");
+    return belo ? Number(belo.sell) : null;
+  }, [quotes]);
 
   const {
     register,
@@ -40,15 +67,48 @@ export function NewExpenseDialog({
     control,
     formState: { errors, isSubmitting },
     reset,
+    setValue,
+    trigger,
   } = useForm<NewExpenseFormValues>({
     resolver: zodResolver(newExpenseSchema),
     defaultValues: {
       description: "",
       amount: 0,
       dueDate: new Date(),
+      walletId: defaultWallet?.id ?? 0,
+      usdcConversionRate: undefined,
     },
   });
 
+  useEffect(() => {
+    if (defaultWallet && !open) return;
+    if (defaultWallet) {
+      setValue("walletId", defaultWallet.id);
+      prevWalletRef.current = defaultWallet.id;
+    }
+  }, [defaultWallet, setValue, open]);
+
+  const usdcConversionRateField = register("usdcConversionRate", {
+    setValueAs: (value) => (value === "" ? undefined : Number(value)),
+  });
+
+  const selectedWalletId = useWatch({ control, name: "walletId" });
+  const selectedWallet = wallets?.find((w) => w.id === selectedWalletId);
+  const isUSDC = selectedWallet?.currency === "USDC";
+
+  useEffect(() => {
+    if (
+      isUSDC &&
+      beloSell &&
+      selectedWalletId &&
+      selectedWalletId !== prevWalletRef.current
+    ) {
+      setValue("usdcConversionRate", beloSell);
+      trigger("usdcConversionRate");
+      prevWalletRef.current = selectedWalletId;
+    }
+  }, [isUSDC, beloSell, selectedWalletId, setValue, trigger]);
+
   function handleClose(open: boolean) {
     onOpenChange(open);
     if (!open) reset();
@@ -59,6 +119,8 @@ export function NewExpenseDialog({
       description: data.description,
       amount: data.amount,
       dueDate: data.dueDate.toISOString(),
+      walletId: data.walletId,
+      usdcConversionRate: isUSDC ? data.usdcConversionRate : undefined,
     });
     handleClose(false);
   }
@@ -112,6 +174,62 @@ export function NewExpenseDialog({
             )}
           </div>
 
+          <div className="flex flex-col gap-1.5">
+            <label className="text-sm font-medium">Billetera</label>
+            <Controller
+              control={control}
+              name="walletId"
+              render={({ field }) => (
+                <Select
+                  value={field.value ? String(field.value) : ""}
+                  onValueChange={(v) => field.onChange(Number(v))}
+                >
+                  <SelectTrigger className="h-8 w-full">
+                    <SelectValue placeholder="Seleccionar billetera" />
+                  </SelectTrigger>
+                  <SelectContent>
+                    {wallets?.map((w) => (
+                      <SelectItem key={w.id} value={String(w.id)}>
+                        {w.name} ({w.currency})
+                      </SelectItem>
+                    ))}
+                  </SelectContent>
+                </Select>
+              )}
+            />
+            {errors.walletId && (
+              <span className="text-xs text-destructive">
+                {errors.walletId.message}
+              </span>
+            )}
+          </div>
+
+          {isUSDC && (
+            <div className="flex flex-col gap-1.5">
+              <label
+                htmlFor="usdcConversionRate"
+                className="text-sm font-medium"
+              >
+                Cotización USDC (ARS por USDC)
+              </label>
+              <input
+                id="usdcConversionRate"
+                type="text"
+                inputMode="decimal"
+                {...usdcConversionRateField}
+                className="h-8 rounded-lg border border-input bg-background px-2.5 text-sm outline-none focus-visible:border-ring focus-visible:ring-3 focus-visible:ring-ring/50"
+              />
+              {errors.usdcConversionRate && (
+                <span className="text-xs text-destructive">
+                  {errors.usdcConversionRate.message}
+                </span>
+              )}
+              <span className="text-xs text-muted-foreground">
+                Pre-sugerido: {beloSell ?? "—"} ARS/USDC (BELO)
+              </span>
+            </div>
+          )}
+
           <div className="flex flex-col gap-1.5">
             <span className="text-sm font-medium">Fecha del gasto</span>
             <Controller

apps/frontend/src/features/expenses/components/PayExpenseDialog.tsx

@@ -1,6 +1,6 @@
 import { zodResolver } from "@hookform/resolvers/zod";
-import { useEffect, useRef } from "react";
+import { useEffect, useMemo, useRef } from "react";
-import { Controller, useForm } from "react-hook-form";
+import { Controller, useForm, useWatch } from "react-hook-form";
 import { z } from "zod";
 import { Button } from "@/components/ui/button";
 import { DatePicker } from "@/components/ui/date-picker";
@@ -11,12 +11,28 @@ import {
   ResponsiveDialogHeader,
   ResponsiveDialogTitle,
 } from "@/components/ui/responsive-dialog";
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@/components/ui/select";
 import type { Expense } from "@/lib/api";
 import { useExpensesContext } from "../ExpensesProvider";
+import { useQuotes, useWallets } from "@/lib/queries";
 
 const paySchema = z.object({
   amountPayed: z.number().positive("El monto debe ser mayor a 0"),
   paymentDate: z.date({ message: "La fecha es obligatoria" }),
+  walletId: z
+    .number()
+    .positive("Seleccioná una billetera")
+    .refine((v) => v > 0, "Seleccioná una billetera"),
+  usdcConversionRate: z
+    .number()
+    .positive("La cotización debe ser mayor a 0")
+    .optional(),
 });
 
 type PayFormValues = z.infer<typeof paySchema>;
@@ -34,6 +50,19 @@ export function PayExpenseDialog({
 }: PayExpenseDialogProps) {
   const { payExpense } = useExpensesContext();
   const amountInputRef = useRef<HTMLInputElement | null>(null);
+  const prevWalletRef = useRef(0);
+  const { data: wallets } = useWallets();
+  const { data: quotes } = useQuotes();
+  const defaultWallet = useMemo(
+    () => wallets?.find((w) => w.isDefault),
+    [wallets],
+  );
+
+  const beloSell = useMemo(() => {
+    if (!quotes) return null;
+    const belo = quotes.find((q) => q.type === "BELO");
+    return belo ? Number(belo.sell) : null;
+  }, [quotes]);
 
   const {
     register,
@@ -41,25 +70,54 @@ export function PayExpenseDialog({
     control,
     formState: { errors, isSubmitting },
     reset,
+    setValue,
+    trigger,
   } = useForm<PayFormValues>({
     resolver: zodResolver(paySchema),
     defaultValues: {
       amountPayed: 0,
       paymentDate: undefined,
+      walletId: 0,
+      usdcConversionRate: undefined,
     },
   });
   const { ref: amountPayedRef, ...amountPayedField } = register("amountPayed", {
     setValueAs: (value) => Number(value),
   });
 
+  const usdcConversionRateField = register("usdcConversionRate", {
+    setValueAs: (value) => (value === "" ? undefined : Number(value)),
+  });
+
+  const selectedWalletId = useWatch({ control, name: "walletId" });
+  const selectedWallet = wallets?.find((w) => w.id === selectedWalletId);
+  const isUSDC = selectedWallet?.currency === "USDC";
+
   useEffect(() => {
     if (expense) {
+      const defaultId = defaultWallet?.id ?? 0;
       reset({
         amountPayed: Number(expense.amount),
         paymentDate: new Date(),
+        walletId: defaultId,
+        usdcConversionRate: undefined,
       });
+      prevWalletRef.current = defaultId;
     }
-  }, [expense, reset]);
+  }, [expense, defaultWallet, reset]);
+
+  useEffect(() => {
+    if (
+      isUSDC &&
+      beloSell &&
+      selectedWalletId &&
+      selectedWalletId !== prevWalletRef.current
+    ) {
+      setValue("usdcConversionRate", beloSell);
+      trigger("usdcConversionRate");
+      prevWalletRef.current = selectedWalletId;
+    }
+  }, [isUSDC, beloSell, selectedWalletId, setValue, trigger]);
 
   useEffect(() => {
     if (!open || !expense) return;
@@ -82,6 +140,8 @@ export function PayExpenseDialog({
     await payExpense(expense.id, {
       amountPayed: data.amountPayed,
       paymentDate: data.paymentDate.toISOString(),
+      walletId: data.walletId,
+      usdcConversionRate: isUSDC ? data.usdcConversionRate : undefined,
     });
     handleClose(false);
   }
@@ -133,6 +193,62 @@ export function PayExpenseDialog({
             )}
           </div>
 
+          <div className="flex flex-col gap-1.5">
+            <label className="text-sm font-medium">Billetera</label>
+            <Controller
+              control={control}
+              name="walletId"
+              render={({ field }) => (
+                <Select
+                  value={field.value ? String(field.value) : ""}
+                  onValueChange={(v) => field.onChange(Number(v))}
+                >
+                  <SelectTrigger className="h-8 w-full">
+                    <SelectValue placeholder="Seleccionar billetera" />
+                  </SelectTrigger>
+                  <SelectContent>
+                    {wallets?.map((w) => (
+                      <SelectItem key={w.id} value={String(w.id)}>
+                        {w.name} ({w.currency})
+                      </SelectItem>
+                    ))}
+                  </SelectContent>
+                </Select>
+              )}
+            />
+            {errors.walletId && (
+              <span className="text-xs text-destructive">
+                {errors.walletId.message}
+              </span>
+            )}
+          </div>
+
+          {isUSDC && (
+            <div className="flex flex-col gap-1.5">
+              <label
+                htmlFor="usdcConversionRate"
+                className="text-sm font-medium"
+              >
+                Cotización USDC (ARS por USDC)
+              </label>
+              <input
+                id="usdcConversionRate"
+                type="text"
+                inputMode="decimal"
+                {...usdcConversionRateField}
+                className="h-8 rounded-lg border border-input bg-background px-2.5 text-sm outline-none focus-visible:border-ring focus-visible:ring-3 focus-visible:ring-ring/50"
+              />
+              {errors.usdcConversionRate && (
+                <span className="text-xs text-destructive">
+                  {errors.usdcConversionRate.message}
+                </span>
+              )}
+              <span className="text-xs text-muted-foreground">
+                Pre-sugerido: {beloSell ?? "—"} ARS/USDC (BELO)
+              </span>
+            </div>
+          )}
+
           <div className="flex flex-col gap-1.5">
             <span className="text-sm font-medium">Fecha de pago</span>
             <Controller

apps/frontend/src/features/wallets/components/WalletCard.tsx

@@ -5,6 +5,7 @@ import {
   ArrowUpDown,
   History,
   PencilLine,
+  Star,
 } from "lucide-react";
 import { Button } from "@/components/ui/button";
 import {
@@ -14,6 +15,7 @@ import {
   TooltipTrigger,
 } from "@/components/ui/tooltip";
 import type { Wallet } from "@/lib/api";
+import { useSetDefaultWallet } from "@/lib/queries";
 import { DepositDialog } from "./DepositDialog";
 import { AdjustBalanceDialog } from "./AdjustBalanceDialog";
 import { TransferDialog } from "./TransferDialog";
@@ -30,6 +32,7 @@ interface WalletCardProps {
 }
 
 export function WalletCard({ wallet }: WalletCardProps) {
+  const setDefaultWallet = useSetDefaultWallet();
   const [depositOpen, setDepositOpen] = useState(false);
   const [adjustOpen, setAdjustOpen] = useState(false);
   const [transferOpen, setTransferOpen] = useState(false);
@@ -40,10 +43,40 @@ export function WalletCard({ wallet }: WalletCardProps) {
     <>
       <div className="rounded-lg border p-4 space-y-3">
         <div className="flex items-start justify-between">
-          <div>
+          <div className="flex items-center gap-2">
             <p className="font-medium">{wallet.name}</p>
-            <p className="text-xs text-muted-foreground">{wallet.currency}</p>
+            {wallet.isDefault && (
+              <span className="rounded-full bg-primary/10 px-2 py-0.5 text-[10px] font-medium text-primary">
+                Default
+              </span>
+            )}
           </div>
+          <div className="flex items-center gap-1">
+            <TooltipProvider>
+              <Tooltip>
+                <TooltipTrigger asChild>
+                  <button
+                    type="button"
+                    onClick={() => setDefaultWallet.mutate(wallet.id)}
+                    className={`transition-colors cursor-pointer ${
+                      wallet.isDefault
+                        ? "text-yellow-500 hover:text-yellow-600"
+                        : "text-muted-foreground hover:text-foreground"
+                    }`}
+                  >
+                    <Star
+                      className="size-4"
+                      fill={wallet.isDefault ? "currentColor" : "none"}
+                    />
+                  </button>
+                </TooltipTrigger>
+                <TooltipContent>
+                  {wallet.isDefault
+                    ? "Billetera predeterminada"
+                    : "Marcar como predeterminada"}
+                </TooltipContent>
+              </Tooltip>
+            </TooltipProvider>
             <button
               type="button"
               onClick={() => setEditOpen(true)}
@@ -52,6 +85,7 @@ export function WalletCard({ wallet }: WalletCardProps) {
               <PencilLine className="size-4" />
             </button>
           </div>
+        </div>
 
         <p className="text-2xl font-bold tabular-nums">
           {balanceFormatter.format(wallet.balance)}

apps/frontend/src/lib/api.ts

@@ -149,11 +149,15 @@ export type CreateNonPeriodicExpenseInput = {
   description: string;
   amount: number;
   dueDate: string;
+  walletId: number;
+  usdcConversionRate?: number;
 };
 
 export type PayExpenseInput = {
   amountPayed: number;
   paymentDate?: string;
+  walletId: number;
+  usdcConversionRate?: number;
 };
 
 export type UpdateExpenseInput = {
@@ -327,6 +331,7 @@ export type Wallet = {
   name: string;
   currency: string;
   balance: number;
+  isDefault: boolean;
   createdAt: string;
   updatedAt: string;
 };
@@ -409,6 +414,10 @@ export function transferWallet(
   );
 }
 
+export function setDefaultWallet(id: number): Promise<Wallet> {
+  return mutator<Wallet>(`/api/wallets/${id}/default`, "PUT");
+}
+
 export function getWalletMovements(
   id: number,
 ): Promise<WalletMovement[]> {

apps/frontend/src/lib/queries.ts

@@ -33,6 +33,7 @@ import {
   getTotalPending,
   getWalletMovements,
   getWallets,
+  setDefaultWallet as setDefaultWalletApi,
   importExpenses,
   importPeriodicExpenses,
   type PayExpenseInput,
@@ -261,6 +262,7 @@ export function useCreateNonPeriodicExpense() {
       createNonPeriodicExpenseApi(data),
     onSuccess: () => {
       queryClient.invalidateQueries({ queryKey: expenseKeys.all });
+      queryClient.invalidateQueries({ queryKey: walletKeys.all });
     },
   });
 }
@@ -292,6 +294,7 @@ export function usePayExpense() {
       payExpenseApi(id, data),
     onSuccess: () => {
       queryClient.invalidateQueries({ queryKey: expenseKeys.all });
+      queryClient.invalidateQueries({ queryKey: walletKeys.all });
     },
   });
 }
@@ -358,6 +361,16 @@ export function useDeleteWallet() {
   });
 }
 
+export function useSetDefaultWallet() {
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: (id: number) => setDefaultWalletApi(id),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: walletKeys.all });
+    },
+  });
+}
+
 export function useDepositWallet() {
   const queryClient = useQueryClient();
   return useMutation({