diff --git a/web/src/server/api/root.ts b/web/src/server/api/root.ts
index f0738ac..2f7f70a 100644
--- a/web/src/server/api/root.ts
+++ b/web/src/server/api/root.ts
@@ -4,6 +4,7 @@ import { billingRouter } from "./routers/billing";
 import { notificationRouter } from "./routers/notification";
 import { darkwatchRouter } from "./routers/darkwatch";
 import { voiceprintRouter } from "./routers/voiceprint";
+import { spamshieldRouter } from "./routers/spamshield";
 import { createTRPCRouter } from "./utils";
 
 export const appRouter = createTRPCRouter({
@@ -13,6 +14,7 @@ export const appRouter = createTRPCRouter({
   notification: notificationRouter,
   darkwatch: darkwatchRouter,
   voiceprint: voiceprintRouter,
+  spamshield: spamshieldRouter,
 });
 
 export type AppRouter = typeof appRouter;
diff --git a/web/src/server/api/routers/spamshield.test.ts b/web/src/server/api/routers/spamshield.test.ts
new file mode 100644
index 0000000..e263ab8
--- /dev/null
+++ b/web/src/server/api/routers/spamshield.test.ts
@@ -0,0 +1,218 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { initTRPC, TRPCError } from "@trpc/server";
+import { wrap } from "@typeschema/valibot";
+import {
+  CheckNumberSchema,
+  ClassifySMSSchema,
+  ClassifyCallSchema,
+  CreateRuleSchema,
+  DeleteRuleSchema,
+  FeedbackSchema,
+  StatsFilterSchema,
+} from "../schemas/spamshield";
+
+vi.mock("~/server/services/spamshield.service", () => ({
+  checkNumberReputation: vi.fn(),
+  classifySMS: vi.fn(),
+  classifyCall: vi.fn(),
+  getRules: vi.fn(),
+  createRule: vi.fn(),
+  deleteRule: vi.fn(),
+  submitFeedback: vi.fn(),
+  getStats: vi.fn(),
+}));
+
+import * as spamshieldService from "~/server/services/spamshield.service";
+
+const mockCheckNumber = vi.mocked(spamshieldService.checkNumberReputation);
+const mockClassifySMS = vi.mocked(spamshieldService.classifySMS);
+const mockClassifyCall = vi.mocked(spamshieldService.classifyCall);
+const mockGetRules = vi.mocked(spamshieldService.getRules);
+const mockCreateRule = vi.mocked(spamshieldService.createRule);
+const mockDeleteRule = vi.mocked(spamshieldService.deleteRule);
+const mockSubmitFeedback = vi.mocked(spamshieldService.submitFeedback);
+const mockGetStats = vi.mocked(spamshieldService.getStats);
+
+type User = {
+  id: string; email: string; name: string | null; image: string | null;
+  role: string; emailVerified: Date | null; deletedAt: Date | null;
+  stripeCustomerId: string | null;
+  createdAt: Date; updatedAt: Date;
+};
+type Ctx = { db: object; user: User | null; apiKey: string | null };
+
+function createCaller(user: User | null) {
+  const t = initTRPC.context<Ctx>().create();
+  const isAuthed = t.middleware(({ ctx, next }) => {
+    if (!ctx.user) throw new TRPCError({ code: "UNAUTHORIZED" });
+    return next({ ctx: { ...ctx, user: ctx.user } });
+  });
+
+  const router = t.router({
+    checkNumber: t.procedure
+      .input(wrap(CheckNumberSchema))
+      .query(async ({ input }) => {
+        return mockCheckNumber(input.phoneNumber);
+      }),
+    classifySMS: t.procedure
+      .input(wrap(ClassifySMSSchema))
+      .query(async ({ input }) => {
+        return mockClassifySMS(input.text);
+      }),
+    classifyCall: t.procedure
+      .input(wrap(ClassifyCallSchema))
+      .query(async ({ input }) => {
+        return mockClassifyCall(input.callerNumber, input.duration, input.timeOfDay);
+      }),
+    getRules: t.procedure.use(isAuthed).query(async ({ ctx }) => {
+      return mockGetRules(ctx.user.id);
+    }),
+    createRule: t.procedure.use(isAuthed)
+      .input(wrap(CreateRuleSchema))
+      .mutation(async ({ ctx, input }) => {
+        return mockCreateRule(ctx.user.id, input.ruleType, input.pattern, input.action, input.priority);
+      }),
+    deleteRule: t.procedure.use(isAuthed)
+      .input(wrap(DeleteRuleSchema))
+      .mutation(async ({ ctx, input }) => {
+        return mockDeleteRule(ctx.user.id, input.ruleId);
+      }),
+    submitFeedback: t.procedure.use(isAuthed)
+      .input(wrap(FeedbackSchema))
+      .mutation(async ({ ctx, input }) => {
+        return mockSubmitFeedback(ctx.user.id, input.phoneNumber, input.isSpam, input.feedbackType);
+      }),
+    getStats: t.procedure.use(isAuthed)
+      .input(wrap(StatsFilterSchema))
+      .query(async ({ ctx, input }) => {
+        return mockGetStats(ctx.user.id, input.period);
+      }),
+  });
+
+  const caller = t.createCallerFactory(router);
+  return caller({ db: {} as never, user, apiKey: null });
+}
+
+const baseUser: User = {
+  id: "user-1", email: "a@b.com", name: "Test", image: null,
+  role: "user", emailVerified: null, deletedAt: null,
+  stripeCustomerId: null,
+  createdAt: new Date(), updatedAt: new Date(),
+};
+
+function makeUser(overrides: Partial<User> = {}): User {
+  return { ...baseUser, ...overrides };
+}
+
+beforeEach(() => {
+  vi.clearAllMocks();
+});
+
+describe("spamshield.checkNumber", () => {
+  it("returns reputation for a phone number", async () => {
+    const rep = { phoneNumber: "+1234567890", isSpam: false, confidence: 0.95, source: "internal", score: 0, category: "unknown" };
+    mockCheckNumber.mockResolvedValue(rep);
+    const api = createCaller(null);
+    const result = await api.checkNumber({ phoneNumber: "+1234567890" });
+    expect(result).toEqual(rep);
+  });
+
+  it("normalizes phone number", async () => {
+    mockCheckNumber.mockResolvedValue({ phoneNumber: "+1234567890", isSpam: false, confidence: 1, source: "internal", score: 0, category: "unknown" });
+    const api = createCaller(null);
+    await api.checkNumber({ phoneNumber: "234567890" });
+    expect(mockCheckNumber).toHaveBeenCalledWith("234567890");
+  });
+});
+
+describe("spamshield.classifySMS", () => {
+  it("classifies SMS text", async () => {
+    const result = { isSpam: false, confidence: 1.0, score: 0.0 };
+    mockClassifySMS.mockResolvedValue(result);
+    const api = createCaller(null);
+    const res = await api.classifySMS({ text: "Hello friend" });
+    expect(res.isSpam).toBe(false);
+  });
+});
+
+describe("spamshield.classifyCall", () => {
+  it("classifies call metadata", async () => {
+    const result = { isSpam: false, confidence: 0.5, callerNumber: "+1234567890", matchedRule: null, reputation: null, features: { areaCode: "+12", duration: 30, timeOfDay: 14 } };
+    mockClassifyCall.mockResolvedValue(result);
+    const api = createCaller(null);
+    const res = await api.classifyCall({ callerNumber: "+1234567890", duration: 30, timeOfDay: 14 });
+    expect(res.isSpam).toBe(false);
+  });
+});
+
+describe("spamshield.getRules", () => {
+  it("returns rules for authenticated user", async () => {
+    const rules = { userRules: [], globalRules: [] };
+    mockGetRules.mockResolvedValue(rules);
+    const api = createCaller(makeUser());
+    expect(await api.getRules()).toEqual(rules);
+  });
+
+  it("rejects unauthenticated", async () => {
+    const api = createCaller(null);
+    await expect(api.getRules()).rejects.toThrow(TRPCError);
+  });
+});
+
+describe("spamshield.createRule", () => {
+  it("creates a custom rule", async () => {
+    const rule = { id: "r1", ruleType: "prefix" as const, pattern: "+123", action: "block" as const, priority: 0, userId: "user-1", isActive: true, isGlobal: false, createdAt: new Date(), updatedAt: new Date() };
+    mockCreateRule.mockResolvedValue(rule);
+    const api = createCaller(makeUser());
+    const result = await api.createRule({ ruleType: "prefix", pattern: "+123", action: "block" });
+    expect(result.id).toBe("r1");
+  });
+
+  it("rejects invalid rule type", async () => {
+    const api = createCaller(makeUser());
+    await expect(
+      api.createRule({ ruleType: "invalid" as never, pattern: "test", action: "block" }),
+    ).rejects.toThrow();
+  });
+});
+
+describe("spamshield.deleteRule", () => {
+  it("deletes a rule", async () => {
+    mockDeleteRule.mockResolvedValue({ id: "r1", isActive: false } as never);
+    const api = createCaller(makeUser());
+    const result = await api.deleteRule({ ruleId: "r1" });
+    expect(result.isActive).toBe(false);
+  });
+});
+
+describe("spamshield.submitFeedback", () => {
+  it("submits feedback", async () => {
+    const fb = { id: "fb1", phoneNumber: "+1234567890", isSpam: true, feedbackType: "user_confirmation" };
+    mockSubmitFeedback.mockResolvedValue(fb as never);
+    const api = createCaller(makeUser());
+    const result = await api.submitFeedback({ phoneNumber: "+1234567890", isSpam: true, feedbackType: "user_confirmation" });
+    expect(result.isSpam).toBe(true);
+  });
+
+  it("rejects invalid feedback type", async () => {
+    const api = createCaller(makeUser());
+    await expect(
+      api.submitFeedback({ phoneNumber: "+1234567890", isSpam: true, feedbackType: "invalid" as never }),
+    ).rejects.toThrow();
+  });
+});
+
+describe("spamshield.getStats", () => {
+  it("returns stats for authenticated user", async () => {
+    const stats = { period: "month", totalDetections: 10, spamCount: 5, notSpamCount: 5, accuracy: 50, activeRules: 2 };
+    mockGetStats.mockResolvedValue(stats);
+    const api = createCaller(makeUser());
+    const result = await api.getStats({ period: "month" });
+    expect(result.accuracy).toBe(50);
+  });
+
+  it("rejects unauthenticated", async () => {
+    const api = createCaller(null);
+    await expect(api.getStats({ period: "month" })).rejects.toThrow(TRPCError);
+  });
+});
diff --git a/web/src/server/api/routers/spamshield.ts b/web/src/server/api/routers/spamshield.ts
new file mode 100644
index 0000000..b2ceeb0
--- /dev/null
+++ b/web/src/server/api/routers/spamshield.ts
@@ -0,0 +1,75 @@
+import { wrap } from "@typeschema/valibot";
+import { createTRPCRouter, publicProcedure, protectedProcedure } from "../utils";
+import {
+  CheckNumberSchema,
+  ClassifySMSSchema,
+  ClassifyCallSchema,
+  CreateRuleSchema,
+  DeleteRuleSchema,
+  FeedbackSchema,
+  StatsFilterSchema,
+} from "../schemas/spamshield";
+import * as spamshieldService from "~/server/services/spamshield.service";
+
+export const spamshieldRouter = createTRPCRouter({
+  checkNumber: publicProcedure
+    .input(wrap(CheckNumberSchema))
+    .query(async ({ input }) => {
+      return spamshieldService.checkNumberReputation(input.phoneNumber);
+    }),
+
+  classifySMS: publicProcedure
+    .input(wrap(ClassifySMSSchema))
+    .query(async ({ input }) => {
+      return spamshieldService.classifySMS(input.text);
+    }),
+
+  classifyCall: publicProcedure
+    .input(wrap(ClassifyCallSchema))
+    .query(async ({ input }) => {
+      return spamshieldService.classifyCall(
+        input.callerNumber,
+        input.duration,
+        input.timeOfDay,
+      );
+    }),
+
+  getRules: protectedProcedure.query(async ({ ctx }) => {
+    return spamshieldService.getRules(ctx.user.id);
+  }),
+
+  createRule: protectedProcedure
+    .input(wrap(CreateRuleSchema))
+    .mutation(async ({ ctx, input }) => {
+      return spamshieldService.createRule(
+        ctx.user.id,
+        input.ruleType,
+        input.pattern,
+        input.action,
+        input.priority,
+      );
+    }),
+
+  deleteRule: protectedProcedure
+    .input(wrap(DeleteRuleSchema))
+    .mutation(async ({ ctx, input }) => {
+      return spamshieldService.deleteRule(ctx.user.id, input.ruleId);
+    }),
+
+  submitFeedback: protectedProcedure
+    .input(wrap(FeedbackSchema))
+    .mutation(async ({ ctx, input }) => {
+      return spamshieldService.submitFeedback(
+        ctx.user.id,
+        input.phoneNumber,
+        input.isSpam,
+        input.feedbackType,
+      );
+    }),
+
+  getStats: protectedProcedure
+    .input(wrap(StatsFilterSchema))
+    .query(async ({ ctx, input }) => {
+      return spamshieldService.getStats(ctx.user.id, input.period);
+    }),
+});
diff --git a/web/src/server/api/schemas/spamshield.ts b/web/src/server/api/schemas/spamshield.ts
new file mode 100644
index 0000000..9947668
--- /dev/null
+++ b/web/src/server/api/schemas/spamshield.ts
@@ -0,0 +1,36 @@
+import { object, string, minLength, optional, number, boolean as vBoolean, picklist } from "valibot";
+
+export const CheckNumberSchema = object({
+  phoneNumber: string([minLength(1)]),
+});
+
+export const ClassifySMSSchema = object({
+  text: string([minLength(1)]),
+});
+
+export const ClassifyCallSchema = object({
+  callerNumber: string([minLength(1)]),
+  duration: optional(number()),
+  timeOfDay: optional(number()),
+});
+
+export const CreateRuleSchema = object({
+  ruleType: picklist(["phoneNumber", "areaCode", "prefix", "pattern", "reputation"]),
+  pattern: string([minLength(1)]),
+  action: picklist(["block", "flag", "allow", "challenge"]),
+  priority: optional(number(), 0),
+});
+
+export const DeleteRuleSchema = object({
+  ruleId: string([minLength(1)]),
+});
+
+export const FeedbackSchema = object({
+  phoneNumber: string([minLength(1)]),
+  isSpam: vBoolean(),
+  feedbackType: picklist(["initial_detection", "user_confirmation", "user_rejection", "auto_learned"]),
+});
+
+export const StatsFilterSchema = object({
+  period: optional(picklist(["day", "week", "month", "year"]), "month"),
+});
diff --git a/web/src/server/services/spamshield.service.test.ts b/web/src/server/services/spamshield.service.test.ts
new file mode 100644
index 0000000..2de341b
--- /dev/null
+++ b/web/src/server/services/spamshield.service.test.ts
@@ -0,0 +1,151 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+
+const mockSelectFromWhereOrderBy = vi.fn();
+
+vi.mock("~/server/db", () => ({
+  db: {
+    select: vi.fn(() => ({
+      from: vi.fn(() => ({
+        where: vi.fn(() => ({
+          orderBy: mockSelectFromWhereOrderBy,
+          limit: vi.fn().mockResolvedValue([]),
+        })),
+        orderBy: vi.fn(() => ({
+          limit: vi.fn(() => ({
+            offset: vi.fn().mockResolvedValue([]),
+          })),
+        })),
+      })),
+    })),
+    insert: vi.fn(() => ({
+      values: vi.fn(() => ({
+        returning: vi.fn().mockResolvedValue([{ id: "new-id" }]),
+      })),
+    })),
+    update: vi.fn(() => ({
+      set: vi.fn(() => ({
+        where: vi.fn(() => ({
+          returning: vi.fn().mockResolvedValue([{ id: "updated-id" }]),
+        })),
+      })),
+    })),
+  },
+}));
+
+vi.mock("~/server/db/schema", () => ({
+  spamFeedback: {},
+  spamRules: {},
+  auditLogs: {},
+}));
+
+vi.mock("./spamshield/ml.engine", () => ({
+  classifyTextBERT: vi.fn(),
+  extractFeatures: vi.fn(),
+  ruleEngine: vi.fn(),
+}));
+
+vi.mock("./spamshield/reputation.api", () => ({
+  checkReputation: vi.fn(),
+  lookupInternalDB: vi.fn(),
+  lookupHiya: vi.fn(),
+  lookupTruecaller: vi.fn(),
+  cacheReputation: vi.fn(),
+}));
+
+import * as spamshieldService from "./spamshield.service";
+import { classifyTextBERT, extractFeatures, ruleEngine } from "./spamshield/ml.engine";
+import { checkReputation } from "./spamshield/reputation.api";
+
+beforeEach(() => {
+  vi.clearAllMocks();
+});
+
+describe("spamshield.checkNumberReputation", () => {
+  it("normalizes phone number before lookup", async () => {
+    vi.mocked(checkReputation).mockResolvedValue(null);
+    const result = await spamshieldService.checkNumberReputation("234567890");
+    expect(result.phoneNumber).toBe("+1234567890");
+  });
+
+  it("returns reputation when found", async () => {
+    vi.mocked(checkReputation).mockResolvedValue({
+      source: "hiya",
+      score: 0.9,
+      isSpam: true,
+      confidence: 0.85,
+      category: "spam",
+    });
+    const result = await spamshieldService.checkNumberReputation("+1234567890");
+    expect(result.isSpam).toBe(true);
+    expect(result.source).toBe("hiya");
+  });
+
+  it("returns default when reputation not found", async () => {
+    vi.mocked(checkReputation).mockResolvedValue(null);
+    const result = await spamshieldService.checkNumberReputation("+1234567890");
+    expect(result.isSpam).toBe(false);
+    expect(result.source).toBe("internal");
+  });
+});
+
+describe("spamshield.classifySMS", () => {
+  it("classifies text as ham", async () => {
+    vi.mocked(classifyTextBERT).mockResolvedValue({ isSpam: false, confidence: 1.0, score: 0.0 });
+    const result = await spamshieldService.classifySMS("Hello friend");
+    expect(result.isSpam).toBe(false);
+  });
+
+  it("classifies text as spam", async () => {
+    vi.mocked(classifyTextBERT).mockResolvedValue({ isSpam: true, confidence: 0.95, score: 0.95 });
+    const result = await spamshieldService.classifySMS("Win free money now");
+    expect(result.isSpam).toBe(true);
+    expect(result.confidence).toBe(0.95);
+  });
+});
+
+describe("spamshield.classifyCall", () => {
+  beforeEach(() => {
+    vi.mocked(extractFeatures).mockResolvedValue({
+      callerNumber: "+1234567890",
+      areaCode: "+12",
+      prefix: "+12345",
+      duration: 30,
+      timeOfDay: 14,
+    });
+    vi.mocked(ruleEngine).mockResolvedValue(null);
+    vi.mocked(checkReputation).mockResolvedValue(null);
+    mockSelectFromWhereOrderBy.mockResolvedValue([]);
+  });
+
+  it("analyzes call metadata", async () => {
+    const result = await spamshieldService.classifyCall("+1234567890", 30, 14);
+    expect(result.callerNumber).toBe("+1234567890");
+  });
+
+  it("flags blocked numbers", async () => {
+    vi.mocked(ruleEngine).mockResolvedValue({
+      matched: true,
+      action: "block",
+      ruleId: "r1",
+      ruleType: "phoneNumber",
+    });
+    const result = await spamshieldService.classifyCall("+1234567890");
+    expect(result.isSpam).toBe(true);
+    expect(result.matchedRule?.action).toBe("block");
+  });
+});
+
+describe("spamshield.createRule", () => {
+  it("creates rule in database", async () => {
+    const fakeRule = { id: "r1", userId: "user-1", ruleType: "prefix", pattern: "+123", action: "block", priority: 0, isActive: true, isGlobal: false, createdAt: new Date(), updatedAt: new Date() };
+
+    const mockDb = await import("~/server/db");
+    vi.mocked(mockDb.db.insert).mockReturnValue({
+      values: vi.fn().mockReturnValue({ returning: vi.fn().mockResolvedValue([fakeRule]) }),
+    } as never);
+
+    const result = await spamshieldService.createRule("user-1", "prefix", "+123", "block", 0);
+    expect(result.id).toBe("r1");
+    expect(result.pattern).toBe("+123");
+  });
+});
diff --git a/web/src/server/services/spamshield.service.ts b/web/src/server/services/spamshield.service.ts
new file mode 100644
index 0000000..1625009
--- /dev/null
+++ b/web/src/server/services/spamshield.service.ts
@@ -0,0 +1,294 @@
+import { TRPCError } from "@trpc/server";
+import { eq, and, desc, count, sql, gte } from "drizzle-orm";
+import { db } from "~/server/db";
+import { spamFeedback, spamRules, auditLogs } from "~/server/db/schema";
+import { classifyTextBERT, extractFeatures, ruleEngine } from "./spamshield/ml.engine";
+import { checkReputation } from "./spamshield/reputation.api";
+import type { ReputationResult } from "./spamshield/reputation.api";
+
+function normalizePhoneNumber(phone: string): string {
+  let cleaned = phone.replace(/[^\d+]/g, "");
+  if (!cleaned.startsWith("+")) {
+    if (cleaned.startsWith("1")) {
+      cleaned = `+${cleaned}`;
+    } else {
+      cleaned = `+1${cleaned}`;
+    }
+  }
+  return cleaned;
+}
+
+async function logAudit(
+  userId: string | undefined,
+  action: string,
+  input: unknown,
+  output: unknown,
+  confidence?: number,
+) {
+  try {
+    await db.insert(auditLogs).values({
+      userId,
+      action: `spamshield.${action}`,
+      resource: "spamshield",
+      metadata: {
+        input,
+        output,
+        confidence,
+        modelVersion: "1.0",
+        timestamp: new Date().toISOString(),
+      },
+    });
+  } catch (err) {
+    console.error("[spamshield] Failed to write audit log:", err);
+  }
+}
+
+export async function checkNumberReputation(phoneNumber: string) {
+  const normalized = normalizePhoneNumber(phoneNumber);
+
+  let result: {
+    source: string;
+    score: number;
+    isSpam: boolean;
+    confidence: number;
+    category: string;
+  } | null = null;
+
+  if (normalized.length >= 10) {
+    result = await checkReputation(normalized);
+  }
+
+  const response = {
+    phoneNumber: normalized,
+    isSpam: result?.isSpam ?? false,
+    confidence: result?.confidence ?? 0,
+    source: result?.source ?? "internal",
+    score: result?.score ?? 0,
+    category: result?.category ?? "unknown",
+  };
+
+  await logAudit(undefined, "checkNumber", { phoneNumber: normalized }, response, response.confidence);
+
+  return response;
+}
+
+export async function classifySMS(text: string) {
+  const classification = await classifyTextBERT(text);
+
+  const response = {
+    isSpam: classification.isSpam,
+    confidence: classification.confidence,
+    score: classification.score,
+  };
+
+  await logAudit(undefined, "classifySMS", { textLength: text.length }, response, response.confidence);
+
+  return response;
+}
+
+export async function classifyCall(
+  callerNumber: string,
+  duration?: number,
+  timeOfDay?: number,
+) {
+  const normalized = normalizePhoneNumber(callerNumber);
+  const features = await extractFeatures({ callerNumber: normalized, duration, timeOfDay });
+
+  const rules = await db
+    .select()
+    .from(spamRules)
+    .where(and(eq(spamRules.isActive, true), eq(spamRules.isGlobal, true)))
+    .orderBy(desc(spamRules.priority));
+
+  const ruleMatch = await ruleEngine(
+    rules.map((r) => ({
+      id: r.id,
+      ruleType: r.ruleType,
+      pattern: r.pattern,
+      action: r.action as "block" | "flag" | "allow" | "challenge",
+      priority: r.priority,
+    })),
+    { phoneNumber: normalized },
+  );
+
+  const reputation = await checkReputation(normalized);
+
+  const isSpam = ruleMatch?.action === "block" || (reputation?.isSpam ?? false);
+  const confidence = Math.max(
+    ruleMatch ? 0.9 : 0,
+    reputation?.confidence ?? 0,
+  );
+
+  const response = {
+    isSpam,
+    confidence,
+    callerNumber: normalized,
+    matchedRule: ruleMatch
+      ? { ruleId: ruleMatch.ruleId, action: ruleMatch.action, ruleType: ruleMatch.ruleType }
+      : null,
+    reputation: reputation
+      ? { source: reputation.source, score: reputation.score, category: reputation.category }
+      : null,
+    features: {
+      areaCode: features.areaCode,
+      duration: features.duration,
+      timeOfDay: features.timeOfDay,
+    },
+  };
+
+  await logAudit(undefined, "classifyCall", { callerNumber: normalized, duration, timeOfDay }, response, confidence);
+
+  return response;
+}
+
+export async function getRules(userId: string) {
+  const userRules = await db
+    .select()
+    .from(spamRules)
+    .where(and(eq(spamRules.userId, userId), eq(spamRules.isActive, true)))
+    .orderBy(desc(spamRules.priority));
+
+  const globalRules = await db
+    .select()
+    .from(spamRules)
+    .where(and(eq(spamRules.isGlobal, true), eq(spamRules.isActive, true)))
+    .orderBy(desc(spamRules.priority));
+
+  return { userRules, globalRules };
+}
+
+export async function createRule(
+  userId: string,
+  ruleType: string,
+  pattern: string,
+  action: string,
+  priority: number,
+) {
+  const [rule] = await db
+    .insert(spamRules)
+    .values({
+      userId,
+      ruleType: ruleType as "phoneNumber" | "areaCode" | "prefix" | "pattern" | "reputation",
+      pattern,
+      action: action as "block" | "flag" | "allow" | "challenge",
+      priority,
+    })
+    .returning();
+
+  await logAudit(userId, "createRule", { ruleType, pattern, action, priority }, rule);
+
+  return rule;
+}
+
+export async function deleteRule(userId: string, ruleId: string) {
+  const [existing] = await db
+    .select()
+    .from(spamRules)
+    .where(and(eq(spamRules.id, ruleId), eq(spamRules.userId, userId)))
+    .limit(1);
+
+  if (!existing) {
+    throw new TRPCError({ code: "NOT_FOUND", message: "Rule not found" });
+  }
+
+  const [deleted] = await db
+    .update(spamRules)
+    .set({ isActive: false, updatedAt: new Date() })
+    .where(eq(spamRules.id, ruleId))
+    .returning();
+
+  return deleted;
+}
+
+export async function submitFeedback(
+  userId: string,
+  phoneNumber: string,
+  isSpam: boolean,
+  feedbackType: string,
+) {
+  const normalized = normalizePhoneNumber(phoneNumber);
+  const { createHash } = await import("node:crypto");
+  const phoneNumberHash = createHash("sha256").update(normalized).digest("hex");
+
+  const [feedback] = await db
+    .insert(spamFeedback)
+    .values({
+      userId,
+      phoneNumber: normalized,
+      phoneNumberHash,
+      isSpam,
+      feedbackType: feedbackType as "initial_detection" | "user_confirmation" | "user_rejection" | "auto_learned",
+    })
+    .returning();
+
+  await logAudit(userId, "submitFeedback", { phoneNumber: normalized, isSpam, feedbackType }, feedback);
+
+  return feedback;
+}
+
+export async function getStats(userId: string, period: string = "month") {
+  const now = new Date();
+  let since: Date;
+
+  switch (period) {
+    case "day":
+      since = new Date(now.getTime() - 24 * 60 * 60 * 1000);
+      break;
+    case "week":
+      since = new Date(now.getTime() - 7 * 24 * 60 * 60 * 1000);
+      break;
+    case "year":
+      since = new Date(now.getFullYear() - 1, now.getMonth(), now.getDate());
+      break;
+    case "month":
+    default:
+      since = new Date(now.getFullYear(), now.getMonth() - 1, now.getDate());
+      break;
+  }
+
+  const [totalResult] = await db
+    .select({ count: count() })
+    .from(spamFeedback)
+    .where(and(eq(spamFeedback.userId, userId), gte(spamFeedback.createdAt, since)));
+
+  const [spamResult] = await db
+    .select({ count: count() })
+    .from(spamFeedback)
+    .where(
+      and(
+        eq(spamFeedback.userId, userId),
+        eq(spamFeedback.isSpam, true),
+        gte(spamFeedback.createdAt, since),
+      ),
+    );
+
+  const [notSpamResult] = await db
+    .select({ count: count() })
+    .from(spamFeedback)
+    .where(
+      and(
+        eq(spamFeedback.userId, userId),
+        eq(spamFeedback.isSpam, false),
+        gte(spamFeedback.createdAt, since),
+      ),
+    );
+
+  const rulesCount = await db
+    .select({ count: count() })
+    .from(spamRules)
+    .where(and(eq(spamRules.userId, userId), eq(spamRules.isActive, true)));
+
+  const total = totalResult.count;
+  const spam = spamResult.count;
+  const notSpam = notSpamResult.count;
+  const accuracy = total > 0 ? (spam / total) * 100 : 0;
+
+  return {
+    period,
+    totalDetections: total,
+    spamCount: spam,
+    notSpamCount: notSpam,
+    accuracy: Math.round(accuracy * 100) / 100,
+    activeRules: rulesCount[0].count,
+  };
+}
diff --git a/web/src/server/services/spamshield/ml.engine.test.ts b/web/src/server/services/spamshield/ml.engine.test.ts
new file mode 100644
index 0000000..e957e81
--- /dev/null
+++ b/web/src/server/services/spamshield/ml.engine.test.ts
@@ -0,0 +1,75 @@
+import { describe, it, expect } from "vitest";
+import { classifyTextBERT, extractFeatures, ruleEngine } from "./ml.engine";
+
+describe("classifyTextBERT", () => {
+  it("returns default classification", async () => {
+    const result = await classifyTextBERT("Hello world");
+    expect(result.isSpam).toBe(false);
+    expect(result.confidence).toBe(1.0);
+  });
+});
+
+describe("extractFeatures", () => {
+  it("extracts area code from caller number", async () => {
+    const features = await extractFeatures({ callerNumber: "+14155551234" });
+    expect(features.areaCode).toBe("+14");
+  });
+
+  it("uses provided duration and timeOfDay", async () => {
+    const features = await extractFeatures({ callerNumber: "+1234567890", duration: 120, timeOfDay: 9 });
+    expect(features.duration).toBe(120);
+    expect(features.timeOfDay).toBe(9);
+  });
+});
+
+describe("ruleEngine", () => {
+  it("matches phone number rule", async () => {
+    const rules = [
+      { id: "r1", ruleType: "phoneNumber", pattern: "+1234567890", action: "block" as const, priority: 10 },
+    ];
+    const result = await ruleEngine(rules, { phoneNumber: "+1234567890" });
+    expect(result).not.toBeNull();
+    expect(result!.action).toBe("block");
+  });
+
+  it("matches area code rule", async () => {
+    const rules = [
+      { id: "r2", ruleType: "areaCode" as const, pattern: "+12", action: "flag" as const, priority: 5 },
+    ];
+    const result = await ruleEngine(rules, { phoneNumber: "+1234567890" });
+    expect(result).not.toBeNull();
+    expect(result!.action).toBe("flag");
+  });
+
+  it("matches prefix rule", async () => {
+    const rules = [
+      { id: "r3", ruleType: "prefix" as const, pattern: "+12345", action: "challenge" as const, priority: 1 },
+    ];
+    const result = await ruleEngine(rules, { phoneNumber: "+1234567890" });
+    expect(result).not.toBeNull();
+    expect(result!.action).toBe("challenge");
+  });
+
+  it("matches pattern rule against text", async () => {
+    const rules = [
+      { id: "r4", ruleType: "pattern" as const, pattern: "free money", action: "block" as const, priority: 10 },
+    ];
+    const result = await ruleEngine(rules, { phoneNumber: "+1234567890", text: "Get free money now" });
+    expect(result).not.toBeNull();
+    expect(result!.action).toBe("block");
+  });
+
+  it("respects priority ordering", async () => {
+    const rules = [
+      { id: "r1", ruleType: "prefix" as const, pattern: "+12", action: "allow" as const, priority: 1 },
+      { id: "r2", ruleType: "phoneNumber" as const, pattern: "+1234567890", action: "block" as const, priority: 10 },
+    ];
+    const result = await ruleEngine(rules, { phoneNumber: "+1234567890" });
+    expect(result!.ruleId).toBe("r2");
+  });
+
+  it("returns null when no rules match", async () => {
+    const result = await ruleEngine([], { phoneNumber: "+1234567890" });
+    expect(result).toBeNull();
+  });
+});
diff --git a/web/src/server/services/spamshield/ml.engine.ts b/web/src/server/services/spamshield/ml.engine.ts
new file mode 100644
index 0000000..0a62ac7
--- /dev/null
+++ b/web/src/server/services/spamshield/ml.engine.ts
@@ -0,0 +1,97 @@
+export interface TextClassification {
+  isSpam: boolean;
+  confidence: number;
+  score: number;
+}
+
+export interface CallFeatures {
+  callerNumber: string;
+  areaCode: string;
+  prefix: string;
+  duration: number;
+  timeOfDay: number;
+}
+
+export interface RuleResult {
+  matched: boolean;
+  action: "block" | "flag" | "allow" | "challenge";
+  ruleId: string;
+  ruleType: string;
+}
+
+export async function classifyTextBERT(text: string): Promise<TextClassification> {
+  return {
+    isSpam: false,
+    confidence: 1.0,
+    score: 0.0,
+  };
+}
+
+export async function extractFeatures(metadata: {
+  callerNumber: string;
+  duration?: number;
+  timeOfDay?: number;
+}): Promise<CallFeatures> {
+  const areaCode = metadata.callerNumber.length >= 3
+    ? metadata.callerNumber.slice(0, 3)
+    : metadata.callerNumber;
+
+  return {
+    callerNumber: metadata.callerNumber,
+    areaCode,
+    prefix: metadata.callerNumber.slice(0, 6),
+    duration: metadata.duration ?? 0,
+    timeOfDay: metadata.timeOfDay ?? new Date().getHours(),
+  };
+}
+
+interface Rule {
+  id: string;
+  ruleType: string;
+  pattern: string;
+  action: "block" | "flag" | "allow" | "challenge";
+  priority: number;
+}
+
+export async function ruleEngine(
+  rules: Rule[],
+  input: { phoneNumber: string; text?: string },
+): Promise<RuleResult | null> {
+  const sorted = [...rules].sort((a, b) => b.priority - a.priority);
+
+  for (const rule of sorted) {
+    const matched = matchRule(rule, input);
+    if (matched) {
+      return {
+        matched: true,
+        action: rule.action,
+        ruleId: rule.id,
+        ruleType: rule.ruleType,
+      };
+    }
+  }
+
+  return null;
+}
+
+function matchRule(
+  rule: Rule,
+  input: { phoneNumber: string; text?: string },
+): boolean {
+  switch (rule.ruleType) {
+    case "phoneNumber":
+      return input.phoneNumber === rule.pattern;
+    case "areaCode":
+      return input.phoneNumber.startsWith(rule.pattern);
+    case "prefix":
+      return input.phoneNumber.startsWith(rule.pattern);
+    case "pattern":
+      return input.text
+        ? new RegExp(rule.pattern, "i").test(input.text)
+        : new RegExp(rule.pattern, "i").test(input.phoneNumber);
+    case "reputation":
+      return false;
+    default:
+      return false;
+  }
+}
diff --git a/web/src/server/services/spamshield/reputation.api.test.ts b/web/src/server/services/spamshield/reputation.api.test.ts
new file mode 100644
index 0000000..0d8d5d9
--- /dev/null
+++ b/web/src/server/services/spamshield/reputation.api.test.ts
@@ -0,0 +1,32 @@
+import { describe, it, expect } from "vitest";
+import { lookupHiya, lookupTruecaller, lookupInternalDB, checkReputation } from "./reputation.api";
+
+describe("lookupHiya", () => {
+  it("returns default result", async () => {
+    const result = await lookupHiya("+1234567890");
+    expect(result).not.toBeNull();
+    expect(result!.source).toBe("hiya");
+  });
+});
+
+describe("lookupTruecaller", () => {
+  it("returns default result", async () => {
+    const result = await lookupTruecaller("+1234567890");
+    expect(result).not.toBeNull();
+    expect(result!.source).toBe("truecaller");
+  });
+});
+
+describe("lookupInternalDB", () => {
+  it("returns null for uncached numbers", async () => {
+    const result = await lookupInternalDB("+1234567890");
+    expect(result).toBeNull();
+  });
+});
+
+describe("checkReputation", () => {
+  it("returns null when all APIs return low confidence", async () => {
+    const result = await checkReputation("+1234567890");
+    expect(result).toBeNull();
+  });
+});
diff --git a/web/src/server/services/spamshield/reputation.api.ts b/web/src/server/services/spamshield/reputation.api.ts
new file mode 100644
index 0000000..d39c82b
--- /dev/null
+++ b/web/src/server/services/spamshield/reputation.api.ts
@@ -0,0 +1,118 @@
+export interface ReputationResult {
+  source: string;
+  score: number;
+  isSpam: boolean;
+  confidence: number;
+  category: string;
+  cachedAt?: Date;
+}
+
+const cache = new Map<string, { result: ReputationResult; expiresAt: number }>();
+const CACHE_TTL_MS = 24 * 60 * 60 * 1000;
+
+interface CircuitBreakerState {
+  failures: number;
+  lastFailure: number;
+  isOpen: boolean;
+}
+
+const circuitBreakers = new Map<string, CircuitBreakerState>();
+const MAX_FAILURES = 3;
+const RESET_TIMEOUT_MS = 60_000;
+
+function isCircuitOpen(source: string): boolean {
+  const state = circuitBreakers.get(source);
+  if (!state) return false;
+  if (!state.isOpen) return false;
+  if (Date.now() - state.lastFailure > RESET_TIMEOUT_MS) {
+    state.isOpen = false;
+    state.failures = 0;
+    return false;
+  }
+  return true;
+}
+
+function recordFailure(source: string): void {
+  const state = circuitBreakers.get(source) ?? { failures: 0, lastFailure: 0, isOpen: false };
+  state.failures++;
+  state.lastFailure = Date.now();
+  if (state.failures >= MAX_FAILURES) {
+    state.isOpen = true;
+  }
+  circuitBreakers.set(source, state);
+}
+
+export async function lookupHiya(phoneNumber: string): Promise<ReputationResult | null> {
+  if (isCircuitOpen("hiya")) return null;
+  try {
+    return {
+      source: "hiya",
+      score: 0,
+      isSpam: false,
+      confidence: 0,
+      category: "unknown",
+    };
+  } catch {
+    recordFailure("hiya");
+    return null;
+  }
+}
+
+export async function lookupTruecaller(phoneNumber: string): Promise<ReputationResult | null> {
+  if (isCircuitOpen("truecaller")) return null;
+  try {
+    return {
+      source: "truecaller",
+      score: 0,
+      isSpam: false,
+      confidence: 0,
+      category: "unknown",
+    };
+  } catch {
+    recordFailure("truecaller");
+    return null;
+  }
+}
+
+export async function lookupInternalDB(phoneNumber: string): Promise<ReputationResult | null> {
+  const cached = cache.get(phoneNumber);
+  if (cached && Date.now() < cached.expiresAt) {
+    return cached.result;
+  }
+  return null;
+}
+
+export async function cacheReputation(
+  phoneNumber: string,
+  result: ReputationResult,
+): Promise<void> {
+  cache.set(phoneNumber, {
+    result,
+    expiresAt: Date.now() + CACHE_TTL_MS,
+  });
+}
+
+export async function checkReputation(phoneNumber: string): Promise<{
+  source: string;
+  score: number;
+  isSpam: boolean;
+  confidence: number;
+  category: string;
+} | null> {
+  const cached = await lookupInternalDB(phoneNumber);
+  if (cached) return cached;
+
+  const hiya = await lookupHiya(phoneNumber);
+  if (hiya && hiya.confidence > 0.5) {
+    await cacheReputation(phoneNumber, hiya);
+    return hiya;
+  }
+
+  const truecaller = await lookupTruecaller(phoneNumber);
+  if (truecaller && truecaller.confidence > 0.5) {
+    await cacheReputation(phoneNumber, truecaller);
+    return truecaller;
+  }
+
+  return null;
+}