diff --git a/server/api/quests/daily-visit.post.ts b/server/api/quests/daily-visit.post.ts
new file mode 100644
index 0000000..6667381
--- /dev/null
+++ b/server/api/quests/daily-visit.post.ts
@@ -0,0 +1,106 @@
+import { useSession } from 'h3';
+
+interface DailyVisitResponse {
+  message: string;
+  reward: {
+    coins: number;
+    streakBonus: boolean;
+  };
+  updatedCoins: number;
+}
+
+/**
+ * A helper function to safely get the authenticated user's ID from the session.
+ */
+async function getUserIdFromSession(event: any): Promise<number> {
+  const session = await useSession(event, {
+    password: process.env.SESSION_PASSWORD,
+  });
+  const userId = session.data?.user?.id;
+  if (!userId) {
+    throw createError({ statusCode: 401, statusMessage: 'Unauthorized' });
+  }
+  return userId;
+}
+
+/**
+ * Creates a Date object for the start of a given day in UTC.
+ */
+function getStartOfDay(date: Date): Date {
+  const startOfDay = new Date(date);
+  startOfDay.setUTCHours(0, 0, 0, 0);
+  return startOfDay;
+}
+
+export default defineEventHandler(async (event): Promise<DailyVisitResponse> => {
+  const userId = await getUserIdFromSession(event);
+  const today = getStartOfDay(new Date());
+
+  // 1. Check if the user has already claimed the reward today
+  const existingVisit = await prisma.dailyVisit.findUnique({
+    where: {
+      userId_date: {
+        userId,
+        date: today,
+      },
+    },
+  });
+
+  if (existingVisit) {
+    throw createError({
+      statusCode: 409,
+      statusMessage: 'Daily visit reward has already been claimed today.',
+    });
+  }
+
+  // 2. Check for a 5-day consecutive streak (i.e., visits on the 4 previous days)
+  const previousDates = Array.from({ length: 4 }, (_, i) => {
+    const d = new Date(today);
+    d.setUTCDate(d.getUTCDate() - (i + 1));
+    return d;
+  });
+
+  const priorVisitsCount = await prisma.dailyVisit.count({
+    where: {
+      userId,
+      date: {
+        in: previousDates,
+      },
+    },
+  });
+
+  const hasStreak = priorVisitsCount === 4;
+  
+  // 3. Calculate rewards and update the database in a transaction
+  let totalReward = 1; // Base reward
+  if (hasStreak) {
+    totalReward += 10; // Streak bonus
+  }
+
+  const [, updatedUser] = await prisma.$transaction([
+    prisma.dailyVisit.create({
+      data: {
+        userId,
+        date: today,
+      },
+    }),
+    prisma.user.update({
+      where: { id: userId },
+      data: {
+        coins: {
+          increment: totalReward,
+        },
+      },
+    }),
+  ]);
+
+  // 4. Return the response
+  return {
+    message: hasStreak ? 'Daily visit and streak bonus claimed!' : 'Daily visit claimed!',
+    reward: {
+      coins: totalReward,
+      streakBonus: hasStreak,
+    },
+    updatedCoins: updatedUser.coins,
+  };
+});