diff --git a/src/index.ts b/src/index.ts
index 979e953d..be3ce078 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -25,6 +25,7 @@ import { predictionsRouter } from "./routes/predictions";
 import { usersRouter } from "./routes/users";
 import { usersHealthRouter } from "./routes/users/health";
 import { userPortfolioRouter } from "./routes/users/portfolio";
+import { userStatsRouter } from "./routes/users/stats";
 import { devicesRouter } from "./routes/devices";
 import { adminFeatureFlagsRouter } from "./routes/admin/featureFlags";
 import { adminUsersRouter } from "./routes/adminUsers";
@@ -163,6 +164,7 @@ export function createApp(_options: CreateAppOptions = {}): express.Express {
   app.use("/api/users/health", usersHealthRouter);
   app.use("/api/users", socialRouter);
   app.use("/api/users", userPortfolioRouter);
+  app.use("/api/users", userStatsRouter);
   app.use("/api/users", usersRouter);
   app.use("/api/me/devices", devicesRouter);
   app.use("/api/me/sessions", sessionsRouter);
diff --git a/src/routes/users/stats.ts b/src/routes/users/stats.ts
new file mode 100644
index 00000000..843451f5
--- /dev/null
+++ b/src/routes/users/stats.ts
@@ -0,0 +1,24 @@
+import { Router, Request, Response, NextFunction } from "express";
+import { z } from "zod";
+import { getUserStats } from "../../services/userStatsService";
+
+export const userStatsRouter = Router();
+
+const stellarAddressSchema = z.string().regex(/^G[A-Z2-7]{55}$/, "Invalid Stellar address");
+
+userStatsRouter.get("/:addr/stats", async (req: Request, res: Response, next: NextFunction) => {
+  const parsed = stellarAddressSchema.safeParse(req.params.addr);
+  if (!parsed.success) {
+    return res.status(400).json({ error: { code: "invalid_address" } });
+  }
+
+  try {
+    const stats = await getUserStats(parsed.data);
+    if (!stats) {
+      return res.status(404).json({ error: { code: "not_found" } });
+    }
+    return res.json({ data: stats });
+  } catch (error) {
+    return next(error);
+  }
+});
diff --git a/src/services/userStatsService.ts b/src/services/userStatsService.ts
new file mode 100644
index 00000000..289f665d
--- /dev/null
+++ b/src/services/userStatsService.ts
@@ -0,0 +1,111 @@
+import { eq } from "drizzle-orm";
+import { getDb } from "../db/client";
+import { claims, predictions, users } from "../db/schema";
+import { getRequestId } from "../lib/requestContext";
+import { logger } from "../config/logger";
+
+const CACHE_TTL_MS = 30_000;
+
+type CacheEntry = { expiresAt: number; value: UserStats };
+const cache = new Map<string, CacheEntry>();
+
+export interface UserStats {
+  address: string;
+  totalPredictions: number;
+  totalStaked: string;
+  marketsParticipated: number;
+  byStatus: {
+    won: number;
+    lost: number;
+    pending: number;
+    confirmed: number;
+    claimed: number;
+  };
+  totalClaimed: string;
+  winRate: number;
+  cachedAt: string;
+}
+
+function addDecimalStrings(a: string, b: string): string {
+  if (!a && !b) return "0";
+  if (!a || !/^\d+$/.test(a)) return b && /^\d+$/.test(b) ? b : "0";
+  if (!b || !/^\d+$/.test(b)) return a;
+  return (BigInt(a) + BigInt(b)).toString();
+}
+
+export function clearUserStatsCache(): void {
+  cache.clear();
+}
+
+export async function getUserStats(address: string): Promise<UserStats | null> {
+  const now = Date.now();
+  const cached = cache.get(address);
+  if (cached && cached.expiresAt > now) return cached.value;
+
+  const db = getDb();
+  const userRows = await db
+    .select({ id: users.id, stellarAddress: users.stellarAddress })
+    .from(users)
+    .where(eq(users.stellarAddress, address))
+    .limit(1);
+  const user = userRows[0];
+  if (!user) return null;
+
+  const [predictionRows, claimRows] = await Promise.all([
+    db
+      .select({
+        id: predictions.id,
+        marketId: predictions.marketId,
+        amount: predictions.amount,
+        status: predictions.status,
+      })
+      .from(predictions)
+      .where(eq(predictions.userId, user.id)),
+    db
+      .select({ amount: claims.amount })
+      .from(claims)
+      .where(eq(claims.userId, user.id)),
+  ]);
+
+  const byStatus = { won: 0, lost: 0, pending: 0, confirmed: 0, claimed: 0 };
+  let totalStaked = "0";
+  const markets = new Set<string>();
+
+  for (const row of predictionRows) {
+    totalStaked = addDecimalStrings(totalStaked, row.amount);
+    markets.add(row.marketId);
+
+    const key = row.status as keyof typeof byStatus;
+    if (key in byStatus) {
+      byStatus[key] += 1;
+    }
+  }
+
+  let totalClaimed = "0";
+  for (const row of claimRows) {
+    totalClaimed = addDecimalStrings(totalClaimed, row.amount);
+  }
+
+  const resolvedTotal = byStatus.won + byStatus.lost;
+  const winRate = resolvedTotal > 0 ? byStatus.won / resolvedTotal : 0;
+
+  const stats: UserStats = {
+    address: user.stellarAddress,
+    totalPredictions: predictionRows.length,
+    totalStaked,
+    marketsParticipated: markets.size,
+    byStatus,
+    totalClaimed,
+    winRate,
+    cachedAt: new Date(now).toISOString(),
+  };
+
+  cache.set(address, { value: stats, expiresAt: now + CACHE_TTL_MS });
+
+  logger.info(
+    { reqId: getRequestId(), address, totalPredictions: predictionRows.length, winRate },
+    "Computed user stats",
+  );
+
+  return stats;
+}
diff --git a/tests/userStats.test.ts b/tests/userStats.test.ts
new file mode 100644
index 00000000..77e6a258
--- /dev/null
+++ b/tests/userStats.test.ts
@@ -0,0 +1,73 @@
+process.env.NODE_ENV = "test";
+process.env.LOG_LEVEL = "fatal";
+process.env.DATABASE_URL = "postgres://localhost/test";
+process.env.JWT_SECRET = "stats-test-secret-at-least-32-bytes";
+process.env.STELLAR_NETWORK = "testnet";
+process.env.SOROBAN_RPC_URL = "https://soroban-testnet.stellar.org";
+process.env.HORIZON_URL = "https://horizon-testnet.stellar.org";
+process.env.PREDICTIFY_CONTRACT_ID = "CABCDEF";
+
+jest.mock("ioredis", () => jest.fn().mockImplementation(() => ({ on: jest.fn(), ping: jest.fn() })));
+jest.mock("bullmq", () => ({ Queue: jest.fn().mockImplementation(() => ({ on: jest.fn(), add: jest.fn(), close: jest.fn() })) }));
+
+import request from "supertest";
+import { createApp } from "../src/index";
+import { getUserStats } from "../src/services/userStatsService";
+
+jest.mock("../src/services/userStatsService", () => ({
+  getUserStats: jest.fn(),
+}));
+
+const mockGetUserStats = getUserStats as jest.MockedFunction<typeof getUserStats>;
+const ADDRESS = `G${"A".repeat(55)}`;
+
+describe("GET /api/users/:addr/stats", () => {
+  beforeEach(() => {
+    mockGetUserStats.mockReset();
+  });
+
+  it("returns per-user aggregated stats", async () => {
+    mockGetUserStats.mockResolvedValue({
+      address: ADDRESS,
+      totalPredictions: 42,
+      totalStaked: "15000",
+      marketsParticipated: 8,
+      byStatus: { won: 12, lost: 5, pending: 20, confirmed: 3, claimed: 2 },
+      totalClaimed: "5000",
+      winRate: 0.71,
+      cachedAt: "2026-07-27T00:00:00.000Z",
+    });
+
+    const res = await request(createApp()).get(`/api/users/${ADDRESS}/stats`);
+
+    expect(res.status).toBe(200);
+    expect(res.body.data).toEqual(
+      expect.objectContaining({
+        address: ADDRESS,
+        totalPredictions: 42,
+        totalStaked: "15000",
+        marketsParticipated: 8,
+        winRate: 0.71,
+      }),
+    );
+    expect(res.body.data.byStatus).toEqual({ won: 12, lost: 5, pending: 20, confirmed: 3, claimed: 2 });
+    expect(mockGetUserStats).toHaveBeenCalledWith(ADDRESS);
+  });
+
+  it("rejects invalid addresses", async () => {
+    const res = await request(createApp()).get("/api/users/not-a-wallet/stats");
+
+    expect(res.status).toBe(400);
+    expect(res.body).toEqual({ error: { code: "invalid_address" } });
+    expect(mockGetUserStats).not.toHaveBeenCalled();
+  });
+
+  it("returns 404 for unknown users", async () => {
+    mockGetUserStats.mockResolvedValue(null);
+
+    const res = await request(createApp()).get(`/api/users/${ADDRESS}/stats`);
+
+    expect(res.status).toBe(404);
+    expect(res.body).toEqual({ error: { code: "not_found" } });
+  });
+});
diff --git a/tests/userStatsService.test.ts b/tests/userStatsService.test.ts
new file mode 100644
index 00000000..6033714f
--- /dev/null
+++ b/tests/userStatsService.test.ts
@@ -0,0 +1,102 @@
+import { getUserStats, clearUserStatsCache } from "../src/services/userStatsService";
+
+const select = jest.fn();
+
+jest.mock("../src/db/client", () => ({
+  getDb: () => ({ select }),
+}));
+
+const ADDRESS = `G${"A".repeat(55)}`;
+
+function selectReturning(rows: unknown[], needsLimit = false) {
+  return {
+    from: jest.fn(() => ({
+      where: jest.fn(() =>
+        needsLimit
+          ? { limit: jest.fn(async () => rows) }
+          : Promise.resolve(rows),
+      ),
+    })),
+  };
+}
+
+describe("getUserStats", () => {
+  beforeEach(() => {
+    clearUserStatsCache();
+    select.mockReset();
+  });
+
+  it("aggregates predictions by status and computes win rate", async () => {
+    select
+      .mockReturnValueOnce(selectReturning([{ id: "user-1", stellarAddress: ADDRESS }], true))
+      .mockReturnValueOnce(selectReturning([
+        { id: "p1", marketId: "mkt-1", amount: "100", status: "won" },
+        { id: "p2", marketId: "mkt-1", amount: "50",  status: "lost" },
+        { id: "p3", marketId: "mkt-2", amount: "25",  status: "pending" },
+        { id: "p4", marketId: "mkt-3", amount: "75",  status: "confirmed" },
+        { id: "p5", marketId: "mkt-3", amount: "10",  status: "claimed" },
+      ]))
+      .mockReturnValueOnce(selectReturning([{ amount: "200" }]));
+
+    const stats = await getUserStats(ADDRESS);
+
+    expect(stats).not.toBeNull();
+    expect(stats!.totalPredictions).toBe(5);
+    expect(stats!.totalStaked).toBe("260");
+    expect(stats!.marketsParticipated).toBe(3);
+    expect(stats!.totalClaimed).toBe("200");
+    expect(stats!.byStatus).toEqual({ won: 1, lost: 1, pending: 1, confirmed: 1, claimed: 1 });
+    expect(stats!.winRate).toBe(0.5);
+  });
+
+  it("returns winRate 0 when no resolved predictions", async () => {
+    select
+      .mockReturnValueOnce(selectReturning([{ id: "user-1", stellarAddress: ADDRESS }], true))
+      .mockReturnValueOnce(selectReturning([
+        { id: "p1", marketId: "mkt-1", amount: "10", status: "pending" },
+        { id: "p2", marketId: "mkt-1", amount: "20", status: "pending" },
+      ]))
+      .mockReturnValueOnce(selectReturning([]));
+
+    const stats = await getUserStats(ADDRESS);
+
+    expect(stats!.winRate).toBe(0);
+    expect(stats!.totalStaked).toBe("30");
+  });
+
+  it("returns winRate 1 when all won", async () => {
+    select
+      .mockReturnValueOnce(selectReturning([{ id: "user-1", stellarAddress: ADDRESS }], true))
+      .mockReturnValueOnce(selectReturning([
+        { id: "p1", marketId: "mkt-1", amount: "100", status: "won" },
+        { id: "p2", marketId: "mkt-2", amount: "50",  status: "won" },
+      ]))
+      .mockReturnValueOnce(selectReturning([]));
+
+    const stats = await getUserStats(ADDRESS);
+
+    expect(stats!.winRate).toBe(1);
+    expect(stats!.byStatus).toEqual({ won: 2, lost: 0, pending: 0, confirmed: 0, claimed: 0 });
+  });
+
+  it("returns null for unknown address", async () => {
+    select
+      .mockReturnValueOnce(selectReturning([], true));
+
+    const stats = await getUserStats(ADDRESS);
+
+    expect(stats).toBeNull();
+  });
+
+  it("uses the short-lived cache for repeated reads", async () => {
+    select
+      .mockReturnValueOnce(selectReturning([{ id: "user-1", stellarAddress: ADDRESS }], true))
+      .mockReturnValueOnce(selectReturning([]))
+      .mockReturnValueOnce(selectReturning([]));
+
+    await getUserStats(ADDRESS);
+    await getUserStats(ADDRESS);
+
+    expect(select).toHaveBeenCalledTimes(3);
+  });
+});