diff --git a/.env.example b/.env.example
index 081c73d..5ebe0a7 100644
--- a/.env.example
+++ b/.env.example
@@ -48,3 +48,7 @@ EMIT_INTERVAL_MS=1000
 # Compute consumer behavior
 COMPUTE_DELIVER_POLICY=new
 COMPUTE_CONSUMER_RESET=false
+CLASSIFIER_SWEEP_MIN_PREMIUM=50000
+CLASSIFIER_SWEEP_MIN_COUNT=3
+CLASSIFIER_SPIKE_MIN_PREMIUM=25000
+CLASSIFIER_SPIKE_MIN_SIZE=500
diff --git a/packages/bus/src/subjects.ts b/packages/bus/src/subjects.ts
index 9b22df7..d2c7a39 100644
--- a/packages/bus/src/subjects.ts
+++ b/packages/bus/src/subjects.ts
@@ -4,3 +4,7 @@ export const STREAM_EQUITY_PRINTS = "EQUITY_PRINTS";
 export const SUBJECT_EQUITY_PRINTS = "equities.prints";
 export const STREAM_FLOW_PACKETS = "FLOW_PACKETS";
 export const SUBJECT_FLOW_PACKETS = "flow.packets";
+export const STREAM_CLASSIFIER_HITS = "CLASSIFIER_HITS";
+export const SUBJECT_CLASSIFIER_HITS = "flow.classifier_hits";
+export const STREAM_ALERTS = "ALERTS";
+export const SUBJECT_ALERTS = "flow.alerts";
diff --git a/packages/storage/src/alerts.ts b/packages/storage/src/alerts.ts
new file mode 100644
index 0000000..ef9302c
--- /dev/null
+++ b/packages/storage/src/alerts.ts
@@ -0,0 +1,93 @@
+import type { AlertEvent, ClassifierHit } from "@islandflow/types";
+
+export const ALERTS_TABLE = "alerts";
+
+export type AlertRecord = {
+  source_ts: number;
+  ingest_ts: number;
+  seq: number;
+  trace_id: string;
+  score: number;
+  severity: string;
+  hits_json: string;
+  evidence_refs_json: string;
+};
+
+export const alertsTableDDL = (): string => {
+  return `
+CREATE TABLE IF NOT EXISTS ${ALERTS_TABLE} (
+  source_ts UInt64,
+  ingest_ts UInt64,
+  seq UInt64,
+  trace_id String,
+  score Float64,
+  severity String,
+  hits_json String,
+  evidence_refs_json String
+)
+ENGINE = MergeTree
+ORDER BY (source_ts, seq)
+`;
+};
+
+export const toAlertRecord = (alert: AlertEvent): AlertRecord => {
+  return {
+    source_ts: alert.source_ts,
+    ingest_ts: alert.ingest_ts,
+    seq: alert.seq,
+    trace_id: alert.trace_id,
+    score: alert.score,
+    severity: alert.severity,
+    hits_json: JSON.stringify(alert.hits),
+    evidence_refs_json: JSON.stringify(alert.evidence_refs)
+  };
+};
+
+const safeHitArray = (value: string): ClassifierHit[] => {
+  try {
+    const parsed = JSON.parse(value);
+    if (Array.isArray(parsed)) {
+      return parsed.map((entry) => {
+        const record = entry as Partial<ClassifierHit>;
+        return {
+          classifier_id: String(record.classifier_id ?? ""),
+          confidence: Number(record.confidence ?? 0),
+          direction: String(record.direction ?? ""),
+          explanations: Array.isArray(record.explanations)
+            ? record.explanations.map((item) => String(item))
+            : []
+        };
+      });
+    }
+  } catch {
+    // ignore
+  }
+
+  return [];
+};
+
+const safeStringArray = (value: string): string[] => {
+  try {
+    const parsed = JSON.parse(value);
+    if (Array.isArray(parsed)) {
+      return parsed.map((entry) => String(entry));
+    }
+  } catch {
+    // ignore
+  }
+
+  return [];
+};
+
+export const fromAlertRecord = (record: AlertRecord): AlertEvent => {
+  return {
+    source_ts: record.source_ts,
+    ingest_ts: record.ingest_ts,
+    seq: record.seq,
+    trace_id: record.trace_id,
+    score: record.score,
+    severity: record.severity,
+    hits: safeHitArray(record.hits_json),
+    evidence_refs: safeStringArray(record.evidence_refs_json)
+  };
+};
diff --git a/packages/storage/src/classifier-hits.ts b/packages/storage/src/classifier-hits.ts
new file mode 100644
index 0000000..87baea3
--- /dev/null
+++ b/packages/storage/src/classifier-hits.ts
@@ -0,0 +1,70 @@
+import type { ClassifierHitEvent } from "@islandflow/types";
+
+export const CLASSIFIER_HITS_TABLE = "classifier_hits";
+
+export type ClassifierHitRecord = {
+  source_ts: number;
+  ingest_ts: number;
+  seq: number;
+  trace_id: string;
+  classifier_id: string;
+  confidence: number;
+  direction: string;
+  explanations_json: string;
+};
+
+export const classifierHitsTableDDL = (): string => {
+  return `
+CREATE TABLE IF NOT EXISTS ${CLASSIFIER_HITS_TABLE} (
+  source_ts UInt64,
+  ingest_ts UInt64,
+  seq UInt64,
+  trace_id String,
+  classifier_id String,
+  confidence Float64,
+  direction String,
+  explanations_json String
+)
+ENGINE = MergeTree
+ORDER BY (source_ts, seq)
+`;
+};
+
+export const toClassifierHitRecord = (hit: ClassifierHitEvent): ClassifierHitRecord => {
+  return {
+    source_ts: hit.source_ts,
+    ingest_ts: hit.ingest_ts,
+    seq: hit.seq,
+    trace_id: hit.trace_id,
+    classifier_id: hit.classifier_id,
+    confidence: hit.confidence,
+    direction: hit.direction,
+    explanations_json: JSON.stringify(hit.explanations)
+  };
+};
+
+const safeJsonArray = (value: string): string[] => {
+  try {
+    const parsed = JSON.parse(value);
+    if (Array.isArray(parsed)) {
+      return parsed.map((entry) => String(entry));
+    }
+  } catch {
+    // ignore
+  }
+
+  return [];
+};
+
+export const fromClassifierHitRecord = (record: ClassifierHitRecord): ClassifierHitEvent => {
+  return {
+    source_ts: record.source_ts,
+    ingest_ts: record.ingest_ts,
+    seq: record.seq,
+    trace_id: record.trace_id,
+    classifier_id: record.classifier_id,
+    confidence: record.confidence,
+    direction: record.direction,
+    explanations: safeJsonArray(record.explanations_json)
+  };
+};
diff --git a/packages/storage/src/clickhouse.ts b/packages/storage/src/clickhouse.ts
index c674aeb..e20ff4b 100644
--- a/packages/storage/src/clickhouse.ts
+++ b/packages/storage/src/clickhouse.ts
@@ -1,6 +1,18 @@
 import { createClient, type ClickHouseClient } from "@clickhouse/client";
-import { EquityPrintSchema, FlowPacketSchema, OptionPrintSchema } from "@islandflow/types";
-import type { EquityPrint, FlowPacket, OptionPrint } from "@islandflow/types";
+import {
+  AlertEventSchema,
+  ClassifierHitEventSchema,
+  EquityPrintSchema,
+  FlowPacketSchema,
+  OptionPrintSchema
+} from "@islandflow/types";
+import type {
+  AlertEvent,
+  ClassifierHitEvent,
+  EquityPrint,
+  FlowPacket,
+  OptionPrint
+} from "@islandflow/types";
 import {
   normalizeOptionPrint,
   optionPrintsTableDDL,
@@ -18,6 +30,20 @@ import {
   toFlowPacketRecord,
   type FlowPacketRecord
 } from "./flow-packets";
+import {
+  CLASSIFIER_HITS_TABLE,
+  classifierHitsTableDDL,
+  fromClassifierHitRecord,
+  toClassifierHitRecord,
+  type ClassifierHitRecord
+} from "./classifier-hits";
+import {
+  ALERTS_TABLE,
+  alertsTableDDL,
+  fromAlertRecord,
+  toAlertRecord,
+  type AlertRecord
+} from "./alerts";
 
 export type ClickHouseOptions = {
   url: string;
@@ -59,6 +85,20 @@ export const ensureFlowPacketsTable = async (
   });
 };
 
+export const ensureClassifierHitsTable = async (
+  client: ClickHouseClient
+): Promise<void> => {
+  await client.exec({
+    query: classifierHitsTableDDL()
+  });
+};
+
+export const ensureAlertsTable = async (client: ClickHouseClient): Promise<void> => {
+  await client.exec({
+    query: alertsTableDDL()
+  });
+};
+
 export const insertOptionPrint = async (
   client: ClickHouseClient,
   print: OptionPrint
@@ -95,6 +135,27 @@ export const insertFlowPacket = async (
   });
 };
 
+export const insertClassifierHit = async (
+  client: ClickHouseClient,
+  hit: ClassifierHitEvent
+): Promise<void> => {
+  const record = toClassifierHitRecord(hit);
+  await client.insert({
+    table: CLASSIFIER_HITS_TABLE,
+    values: [record],
+    format: "JSONEachRow"
+  });
+};
+
+export const insertAlert = async (client: ClickHouseClient, alert: AlertEvent): Promise<void> => {
+  const record = toAlertRecord(alert);
+  await client.insert({
+    table: ALERTS_TABLE,
+    values: [record],
+    format: "JSONEachRow"
+  });
+};
+
 const clampLimit = (limit: number): number => {
   if (!Number.isFinite(limit)) {
     return 100;
@@ -196,6 +257,42 @@ const normalizeFlowPacketRow = (row: unknown): FlowPacketRecord | null => {
   };
 };
 
+const normalizeClassifierHitRow = (row: unknown): ClassifierHitRecord | null => {
+  if (!row || typeof row !== "object") {
+    return null;
+  }
+
+  const record = row as Record<string, unknown>;
+  return {
+    source_ts: coerceNumber(record.source_ts) as number,
+    ingest_ts: coerceNumber(record.ingest_ts) as number,
+    seq: coerceNumber(record.seq) as number,
+    trace_id: String(record.trace_id ?? ""),
+    classifier_id: String(record.classifier_id ?? ""),
+    confidence: Number(coerceNumber(record.confidence) ?? 0),
+    direction: String(record.direction ?? ""),
+    explanations_json: String(record.explanations_json ?? "[]")
+  };
+};
+
+const normalizeAlertRow = (row: unknown): AlertRecord | null => {
+  if (!row || typeof row !== "object") {
+    return null;
+  }
+
+  const record = row as Record<string, unknown>;
+  return {
+    source_ts: coerceNumber(record.source_ts) as number,
+    ingest_ts: coerceNumber(record.ingest_ts) as number,
+    seq: coerceNumber(record.seq) as number,
+    trace_id: String(record.trace_id ?? ""),
+    score: Number(coerceNumber(record.score) ?? 0),
+    severity: String(record.severity ?? ""),
+    hits_json: String(record.hits_json ?? "[]"),
+    evidence_refs_json: String(record.evidence_refs_json ?? "[]")
+  };
+};
+
 export const fetchRecentOptionPrints = async (
   client: ClickHouseClient,
   limit: number
@@ -242,6 +339,42 @@ export const fetchRecentFlowPackets = async (
   return FlowPacketSchema.array().parse(packets);
 };
 
+export const fetchRecentClassifierHits = async (
+  client: ClickHouseClient,
+  limit: number
+): Promise<ClassifierHitEvent[]> => {
+  const safeLimit = clampLimit(limit);
+  const result = await client.query({
+    query: `SELECT * FROM ${CLASSIFIER_HITS_TABLE} ORDER BY source_ts DESC, seq DESC LIMIT ${safeLimit}`,
+    format: "JSONEachRow"
+  });
+
+  const rows = await result.json<unknown[]>();
+  const records = rows
+    .map(normalizeClassifierHitRow)
+    .filter((record): record is ClassifierHitRecord => record !== null);
+  const hits = records.map(fromClassifierHitRecord);
+  return ClassifierHitEventSchema.array().parse(hits);
+};
+
+export const fetchRecentAlerts = async (
+  client: ClickHouseClient,
+  limit: number
+): Promise<AlertEvent[]> => {
+  const safeLimit = clampLimit(limit);
+  const result = await client.query({
+    query: `SELECT * FROM ${ALERTS_TABLE} ORDER BY source_ts DESC, seq DESC LIMIT ${safeLimit}`,
+    format: "JSONEachRow"
+  });
+
+  const rows = await result.json<unknown[]>();
+  const records = rows
+    .map(normalizeAlertRow)
+    .filter((record): record is AlertRecord => record !== null);
+  const alerts = records.map(fromAlertRecord);
+  return AlertEventSchema.array().parse(alerts);
+};
+
 export const fetchOptionPrintsAfter = async (
   client: ClickHouseClient,
   afterTs: number,
diff --git a/packages/storage/src/index.ts b/packages/storage/src/index.ts
index 69a4bca..a1d4aed 100644
--- a/packages/storage/src/index.ts
+++ b/packages/storage/src/index.ts
@@ -1,4 +1,6 @@
 export * from "./clickhouse";
+export * from "./classifier-hits";
+export * from "./alerts";
 export * from "./flow-packets";
 export * from "./equity-prints";
 export * from "./option-prints";
diff --git a/packages/storage/tests/alerts.test.ts b/packages/storage/tests/alerts.test.ts
new file mode 100644
index 0000000..9f9449c
--- /dev/null
+++ b/packages/storage/tests/alerts.test.ts
@@ -0,0 +1,36 @@
+import { describe, expect, it } from "bun:test";
+import { alertsTableDDL, ALERTS_TABLE, fromAlertRecord, toAlertRecord } from "../src/alerts";
+
+const alert = {
+  source_ts: 10,
+  ingest_ts: 20,
+  seq: 1,
+  trace_id: "alert:fp-1",
+  score: 78,
+  severity: "medium",
+  hits: [
+    {
+      classifier_id: "large_bullish_call_sweep",
+      confidence: 0.72,
+      direction: "bullish",
+      explanations: ["Likely call sweep.", "Premium $50000."]
+    }
+  ],
+  evidence_refs: ["flowpacket:1", "print:1"]
+};
+
+describe("alerts storage helpers", () => {
+  it("includes the correct table name in the DDL", () => {
+    const ddl = alertsTableDDL();
+    expect(ddl).toContain(ALERTS_TABLE);
+    expect(ddl).toContain("CREATE TABLE IF NOT EXISTS");
+  });
+
+  it("round-trips alert records", () => {
+    const record = toAlertRecord(alert);
+    const restored = fromAlertRecord(record);
+    expect(restored.hits).toEqual(alert.hits);
+    expect(restored.evidence_refs).toEqual(alert.evidence_refs);
+    expect(restored.severity).toBe(alert.severity);
+  });
+});
diff --git a/packages/storage/tests/classifier-hits.test.ts b/packages/storage/tests/classifier-hits.test.ts
new file mode 100644
index 0000000..b3c46e5
--- /dev/null
+++ b/packages/storage/tests/classifier-hits.test.ts
@@ -0,0 +1,34 @@
+import { describe, expect, it } from "bun:test";
+import {
+  classifierHitsTableDDL,
+  CLASSIFIER_HITS_TABLE,
+  fromClassifierHitRecord,
+  toClassifierHitRecord
+} from "../src/classifier-hits";
+
+const hit = {
+  source_ts: 10,
+  ingest_ts: 20,
+  seq: 1,
+  trace_id: "classifier:large_bullish_call_sweep:fp-1",
+  classifier_id: "large_bullish_call_sweep",
+  confidence: 0.72,
+  direction: "bullish",
+  explanations: ["Likely call sweep.", "Premium $50000."]
+};
+
+describe("classifier hits storage helpers", () => {
+  it("includes the correct table name in the DDL", () => {
+    const ddl = classifierHitsTableDDL();
+    expect(ddl).toContain(CLASSIFIER_HITS_TABLE);
+    expect(ddl).toContain("CREATE TABLE IF NOT EXISTS");
+  });
+
+  it("round-trips classifier hit records", () => {
+    const record = toClassifierHitRecord(hit);
+    const restored = fromClassifierHitRecord(record);
+    expect(restored.explanations).toEqual(hit.explanations);
+    expect(restored.classifier_id).toBe(hit.classifier_id);
+    expect(restored.direction).toBe(hit.direction);
+  });
+});
diff --git a/services/api/src/index.ts b/services/api/src/index.ts
index 444e47c..2f55bcb 100644
--- a/services/api/src/index.ts
+++ b/services/api/src/index.ts
@@ -1,9 +1,13 @@
 import { readEnv } from "@islandflow/config";
 import { createLogger } from "@islandflow/observability";
 import {
+  SUBJECT_ALERTS,
+  SUBJECT_CLASSIFIER_HITS,
   SUBJECT_EQUITY_PRINTS,
   SUBJECT_FLOW_PACKETS,
   SUBJECT_OPTION_PRINTS,
+  STREAM_ALERTS,
+  STREAM_CLASSIFIER_HITS,
   STREAM_EQUITY_PRINTS,
   STREAM_FLOW_PACKETS,
   STREAM_OPTION_PRINTS,
@@ -14,16 +18,26 @@ import {
 } from "@islandflow/bus";
 import {
   createClickHouseClient,
+  ensureAlertsTable,
+  ensureClassifierHitsTable,
   ensureEquityPrintsTable,
   ensureFlowPacketsTable,
   ensureOptionPrintsTable,
+  fetchRecentAlerts,
+  fetchRecentClassifierHits,
   fetchRecentFlowPackets,
   fetchEquityPrintsAfter,
   fetchRecentEquityPrints,
   fetchOptionPrintsAfter,
   fetchRecentOptionPrints
 } from "@islandflow/storage";
-import { EquityPrintSchema, FlowPacketSchema, OptionPrintSchema } from "@islandflow/types";
+import {
+  AlertEventSchema,
+  ClassifierHitEventSchema,
+  EquityPrintSchema,
+  FlowPacketSchema,
+  OptionPrintSchema
+} from "@islandflow/types";
 import { z } from "zod";
 
 const service = "api";
@@ -73,7 +87,7 @@ const replayParamsSchema = z.object({
   limit: z.coerce.number().int().positive().max(1000).default(200)
 });
 
-type Channel = "options" | "equities" | "flow";
+type Channel = "options" | "equities" | "flow" | "classifier-hits" | "alerts";
 
 type WsData = {
   channel: Channel;
@@ -82,6 +96,8 @@ type WsData = {
 const optionSockets = new Set<WebSocket<WsData>>();
 const equitySockets = new Set<WebSocket<WsData>>();
 const flowSockets = new Set<WebSocket<WsData>>();
+const classifierHitSockets = new Set<WebSocket<WsData>>();
+const alertSockets = new Set<WebSocket<WsData>>();
 
 const jsonResponse = (body: unknown, status = 200): Response => {
   return new Response(JSON.stringify(body), {
@@ -179,6 +195,32 @@ const run = async () => {
     num_replicas: 1
   });
 
+  await ensureStream(jsm, {
+    name: STREAM_CLASSIFIER_HITS,
+    subjects: [SUBJECT_CLASSIFIER_HITS],
+    retention: "limits",
+    storage: "file",
+    discard: "old",
+    max_msgs_per_subject: -1,
+    max_msgs: -1,
+    max_bytes: -1,
+    max_age: 0,
+    num_replicas: 1
+  });
+
+  await ensureStream(jsm, {
+    name: STREAM_ALERTS,
+    subjects: [SUBJECT_ALERTS],
+    retention: "limits",
+    storage: "file",
+    discard: "old",
+    max_msgs_per_subject: -1,
+    max_msgs: -1,
+    max_bytes: -1,
+    max_age: 0,
+    num_replicas: 1
+  });
+
   const clickhouse = createClickHouseClient({
     url: env.CLICKHOUSE_URL,
     database: env.CLICKHOUSE_DATABASE
@@ -188,6 +230,8 @@ const run = async () => {
     await ensureOptionPrintsTable(clickhouse);
     await ensureEquityPrintsTable(clickhouse);
     await ensureFlowPacketsTable(clickhouse);
+    await ensureClassifierHitsTable(clickhouse);
+    await ensureAlertsTable(clickhouse);
   });
 
   const optionSubscription = await subscribeJson(
@@ -208,6 +252,18 @@ const run = async () => {
     buildDurableConsumer("api-flow-packets")
   );
 
+  const classifierHitSubscription = await subscribeJson(
+    js,
+    SUBJECT_CLASSIFIER_HITS,
+    buildDurableConsumer("api-classifier-hits")
+  );
+
+  const alertSubscription = await subscribeJson(
+    js,
+    SUBJECT_ALERTS,
+    buildDurableConsumer("api-alerts")
+  );
+
   const pumpOptions = async () => {
     for await (const msg of optionSubscription.messages) {
       try {
@@ -253,9 +309,41 @@ const run = async () => {
     }
   };
 
+  const pumpClassifierHits = async () => {
+    for await (const msg of classifierHitSubscription.messages) {
+      try {
+        const payload = ClassifierHitEventSchema.parse(classifierHitSubscription.decode(msg));
+        broadcast(classifierHitSockets, { type: "classifier-hit", payload });
+        msg.ack();
+      } catch (error) {
+        logger.error("failed to process classifier hit", {
+          error: error instanceof Error ? error.message : String(error)
+        });
+        msg.term();
+      }
+    }
+  };
+
+  const pumpAlerts = async () => {
+    for await (const msg of alertSubscription.messages) {
+      try {
+        const payload = AlertEventSchema.parse(alertSubscription.decode(msg));
+        broadcast(alertSockets, { type: "alert", payload });
+        msg.ack();
+      } catch (error) {
+        logger.error("failed to process alert", {
+          error: error instanceof Error ? error.message : String(error)
+        });
+        msg.term();
+      }
+    }
+  };
+
   void pumpOptions();
   void pumpEquities();
   void pumpFlow();
+  void pumpClassifierHits();
+  void pumpAlerts();
 
   const server = Bun.serve<WsData>({
     port: env.API_PORT,
@@ -284,6 +372,18 @@ const run = async () => {
         return jsonResponse({ data });
       }
 
+      if (req.method === "GET" && url.pathname === "/flow/classifier-hits") {
+        const limit = parseLimit(url.searchParams.get("limit"));
+        const data = await fetchRecentClassifierHits(clickhouse, limit);
+        return jsonResponse({ data });
+      }
+
+      if (req.method === "GET" && url.pathname === "/flow/alerts") {
+        const limit = parseLimit(url.searchParams.get("limit"));
+        const data = await fetchRecentAlerts(clickhouse, limit);
+        return jsonResponse({ data });
+      }
+
       if (req.method === "GET" && url.pathname === "/replay/options") {
         const { afterTs, afterSeq, limit } = parseReplayParams(url);
         const data = await fetchOptionPrintsAfter(clickhouse, afterTs, afterSeq, limit);
@@ -324,6 +424,22 @@ const run = async () => {
         return jsonResponse({ error: "websocket upgrade failed" }, 400);
       }
 
+      if (req.method === "GET" && url.pathname === "/ws/classifier-hits") {
+        if (serverRef.upgrade(req, { data: { channel: "classifier-hits" } })) {
+          return new Response(null, { status: 101 });
+        }
+
+        return jsonResponse({ error: "websocket upgrade failed" }, 400);
+      }
+
+      if (req.method === "GET" && url.pathname === "/ws/alerts") {
+        if (serverRef.upgrade(req, { data: { channel: "alerts" } })) {
+          return new Response(null, { status: 101 });
+        }
+
+        return jsonResponse({ error: "websocket upgrade failed" }, 400);
+      }
+
       return jsonResponse({ error: "not found" }, 404);
     },
     websocket: {
@@ -332,8 +448,12 @@ const run = async () => {
           optionSockets.add(socket);
         } else if (socket.data.channel === "equities") {
           equitySockets.add(socket);
-        } else {
+        } else if (socket.data.channel === "flow") {
           flowSockets.add(socket);
+        } else if (socket.data.channel === "classifier-hits") {
+          classifierHitSockets.add(socket);
+        } else {
+          alertSockets.add(socket);
         }
 
         logger.info("websocket connected", { channel: socket.data.channel });
@@ -343,8 +463,12 @@ const run = async () => {
           optionSockets.delete(socket);
         } else if (socket.data.channel === "equities") {
           equitySockets.delete(socket);
-        } else {
+        } else if (socket.data.channel === "flow") {
           flowSockets.delete(socket);
+        } else if (socket.data.channel === "classifier-hits") {
+          classifierHitSockets.delete(socket);
+        } else {
+          alertSockets.delete(socket);
         }
 
         logger.info("websocket disconnected", { channel: socket.data.channel });
diff --git a/services/compute/src/classifiers.ts b/services/compute/src/classifiers.ts
new file mode 100644
index 0000000..2fd9e56
--- /dev/null
+++ b/services/compute/src/classifiers.ts
@@ -0,0 +1,221 @@
+import type { ClassifierHit, FlowPacket } from "@islandflow/types";
+
+type ParsedContract = {
+  root: string;
+  expiry: string;
+  strike: number;
+  right: "C" | "P";
+};
+
+export type ClassifierConfig = {
+  sweepMinPremium: number;
+  sweepMinCount: number;
+  spikeMinPremium: number;
+  spikeMinSize: number;
+};
+
+const clamp = (value: number, min = 0, max = 1): number => {
+  if (!Number.isFinite(value)) {
+    return min;
+  }
+  return Math.max(min, Math.min(max, value));
+};
+
+const formatUsd = (value: number): string => {
+  if (!Number.isFinite(value)) {
+    return "$0";
+  }
+  return `$${value.toFixed(2)}`;
+};
+
+const parseDashedContract = (value: string): ParsedContract | null => {
+  const parts = value.split("-");
+  if (parts.length < 6) {
+    return null;
+  }
+
+  const rightRaw = parts.at(-1) ?? "";
+  if (rightRaw !== "C" && rightRaw !== "P") {
+    return null;
+  }
+
+  const strikeRaw = parts.at(-2) ?? "";
+  const strike = Number(strikeRaw);
+  const expiryParts = parts.slice(-5, -2);
+  const expiry = expiryParts.join("-");
+  const root = parts.slice(0, -5).join("-");
+
+  if (!root || !expiry || !Number.isFinite(strike)) {
+    return null;
+  }
+
+  return {
+    root,
+    expiry,
+    strike,
+    right: rightRaw
+  };
+};
+
+const parseOccContract = (value: string): ParsedContract | null => {
+  if (value.length < 15) {
+    return null;
+  }
+
+  const tail = value.slice(-15);
+  const root = value.slice(0, -15).trim();
+  const expiryRaw = tail.slice(0, 6);
+  const right = tail.slice(6, 7);
+  const strikeRaw = tail.slice(7);
+
+  if (!/^\d{6}$/.test(expiryRaw) || !/^\d{8}$/.test(strikeRaw)) {
+    return null;
+  }
+
+  if (right !== "C" && right !== "P") {
+    return null;
+  }
+
+  const year = 2000 + Number(expiryRaw.slice(0, 2));
+  const month = Number(expiryRaw.slice(2, 4)) - 1;
+  const day = Number(expiryRaw.slice(4, 6));
+  const expiryDate = new Date(Date.UTC(year, month, day));
+  const expiry = expiryDate.toISOString().slice(0, 10);
+  const strike = Number(strikeRaw) / 1000;
+
+  if (!root || !Number.isFinite(strike)) {
+    return null;
+  }
+
+  return {
+    root,
+    expiry,
+    strike,
+    right
+  };
+};
+
+const parseContractId = (value: string | undefined): ParsedContract | null => {
+  if (!value) {
+    return null;
+  }
+
+  return parseDashedContract(value) ?? parseOccContract(value);
+};
+
+const getNumberFeature = (packet: FlowPacket, key: string): number => {
+  const value = packet.features[key];
+  return typeof value === "number" && Number.isFinite(value) ? value : 0;
+};
+
+const buildSweepHit = (
+  packet: FlowPacket,
+  contract: ParsedContract,
+  direction: "bullish" | "bearish",
+  config: ClassifierConfig
+): ClassifierHit | null => {
+  const count = getNumberFeature(packet, "count");
+  const totalPremium = getNumberFeature(packet, "total_premium");
+  const totalSize = getNumberFeature(packet, "total_size");
+  const firstPrice = getNumberFeature(packet, "first_price");
+  const lastPrice = getNumberFeature(packet, "last_price");
+  const windowMs = getNumberFeature(packet, "window_ms");
+
+  if (count < config.sweepMinCount || totalPremium < config.sweepMinPremium) {
+    return null;
+  }
+
+  const priceDelta = lastPrice - firstPrice;
+  const priceTrend = priceDelta >= 0 ? "up" : "down";
+
+  let confidence = 0.55;
+  if (priceDelta >= 0) {
+    confidence += 0.1;
+  }
+  if (count >= config.sweepMinCount + 2) {
+    confidence += 0.1;
+  }
+  if (totalPremium >= config.sweepMinPremium * 2) {
+    confidence += 0.15;
+  }
+
+  confidence = clamp(confidence, 0, 0.95);
+
+  return {
+    classifier_id: direction === "bullish" ? "large_bullish_call_sweep" : "large_bearish_put_sweep",
+    confidence,
+    direction,
+    explanations: [
+      `Likely ${direction === "bullish" ? "call" : "put"} sweep: ${count} prints in ${Math.round(windowMs)}ms for ${packet.features.option_contract_id ?? packet.id}.`,
+      `Premium ${formatUsd(totalPremium)} across ${Math.round(totalSize)} contracts; price ${priceTrend}.`,
+      `Thresholds: >=${config.sweepMinCount} prints and >=${formatUsd(config.sweepMinPremium)} premium.`
+    ]
+  };
+};
+
+const buildSpikeHit = (packet: FlowPacket, config: ClassifierConfig): ClassifierHit | null => {
+  const count = getNumberFeature(packet, "count");
+  const totalPremium = getNumberFeature(packet, "total_premium");
+  const totalSize = getNumberFeature(packet, "total_size");
+  const windowMs = getNumberFeature(packet, "window_ms");
+
+  if (totalSize < config.spikeMinSize || totalPremium < config.spikeMinPremium) {
+    return null;
+  }
+
+  let confidence = 0.5;
+  if (totalSize >= config.spikeMinSize * 2) {
+    confidence += 0.15;
+  }
+  if (totalPremium >= config.spikeMinPremium * 2) {
+    confidence += 0.15;
+  }
+  if (count >= 3) {
+    confidence += 0.1;
+  }
+
+  confidence = clamp(confidence, 0, 0.9);
+
+  return {
+    classifier_id: "unusual_contract_spike",
+    confidence,
+    direction: "neutral",
+    explanations: [
+      `Unusual contract spike: ${count} prints in ${Math.round(windowMs)}ms for ${packet.features.option_contract_id ?? packet.id}.`,
+      `Premium ${formatUsd(totalPremium)} across ${Math.round(totalSize)} contracts.`,
+      `Thresholds: >=${config.spikeMinSize} contracts and >=${formatUsd(config.spikeMinPremium)} premium.`
+    ]
+  };
+};
+
+export const evaluateClassifiers = (
+  packet: FlowPacket,
+  config: ClassifierConfig
+): ClassifierHit[] => {
+  const contractId = typeof packet.features.option_contract_id === "string"
+    ? packet.features.option_contract_id
+    : "";
+  const contract = parseContractId(contractId);
+  const hits: ClassifierHit[] = [];
+
+  if (contract?.right === "C") {
+    const hit = buildSweepHit(packet, contract, "bullish", config);
+    if (hit) {
+      hits.push(hit);
+    }
+  }
+
+  if (contract?.right === "P") {
+    const hit = buildSweepHit(packet, contract, "bearish", config);
+    if (hit) {
+      hits.push(hit);
+    }
+  }
+
+  const spikeHit = buildSpikeHit(packet, config);
+  if (spikeHit) {
+    hits.push(spikeHit);
+  }
+
+  return hits;
+};
diff --git a/services/compute/src/index.ts b/services/compute/src/index.ts
index cbbd91f..ab5e4f5 100644
--- a/services/compute/src/index.ts
+++ b/services/compute/src/index.ts
@@ -1,8 +1,12 @@
 import { readEnv } from "@islandflow/config";
 import { createLogger } from "@islandflow/observability";
 import {
+  SUBJECT_ALERTS,
+  SUBJECT_CLASSIFIER_HITS,
   SUBJECT_FLOW_PACKETS,
   SUBJECT_OPTION_PRINTS,
+  STREAM_ALERTS,
+  STREAM_CLASSIFIER_HITS,
   STREAM_FLOW_PACKETS,
   STREAM_OPTION_PRINTS,
   buildDurableConsumer,
@@ -13,11 +17,25 @@ import {
 } from "@islandflow/bus";
 import {
   createClickHouseClient,
+  ensureAlertsTable,
+  ensureClassifierHitsTable,
   ensureFlowPacketsTable,
+  insertAlert,
+  insertClassifierHit,
   insertFlowPacket
 } from "@islandflow/storage";
-import { FlowPacketSchema, OptionPrintSchema, type FlowPacket, type OptionPrint } from "@islandflow/types";
+import {
+  AlertEventSchema,
+  ClassifierHitEventSchema,
+  FlowPacketSchema,
+  OptionPrintSchema,
+  type AlertEvent,
+  type ClassifierHitEvent,
+  type FlowPacket,
+  type OptionPrint
+} from "@islandflow/types";
 import { z } from "zod";
+import { evaluateClassifiers, type ClassifierConfig } from "./classifiers";
 
 const service = "compute";
 const logger = createLogger({ service });
@@ -41,11 +59,22 @@ const envSchema = z.object({
       }
       return value;
     }, z.boolean())
-    .default(false)
+    .default(false),
+  CLASSIFIER_SWEEP_MIN_PREMIUM: z.coerce.number().positive().default(50_000),
+  CLASSIFIER_SWEEP_MIN_COUNT: z.coerce.number().int().positive().default(3),
+  CLASSIFIER_SPIKE_MIN_PREMIUM: z.coerce.number().positive().default(25_000),
+  CLASSIFIER_SPIKE_MIN_SIZE: z.coerce.number().int().positive().default(500)
 });
 
 const env = readEnv(envSchema);
 
+const classifierConfig: ClassifierConfig = {
+  sweepMinPremium: env.CLASSIFIER_SWEEP_MIN_PREMIUM,
+  sweepMinCount: env.CLASSIFIER_SWEEP_MIN_COUNT,
+  spikeMinPremium: env.CLASSIFIER_SPIKE_MIN_PREMIUM,
+  spikeMinSize: env.CLASSIFIER_SPIKE_MIN_SIZE
+};
+
 const retry = async <T>(
   label: string,
   attempts: number,
@@ -170,6 +199,8 @@ const flushCluster = async (
   await insertFlowPacket(clickhouse, validated);
   await publishJson(js, SUBJECT_FLOW_PACKETS, validated);
 
+  await emitClassifiers(clickhouse, js, validated);
+
   logger.info("emitted flow packet", {
     id: validated.id,
     contract: cluster.contractId,
@@ -177,6 +208,79 @@ const flushCluster = async (
   });
 };
 
+const scoreAlert = (packet: FlowPacket, hits: ClassifierHitEvent[]): { score: number; severity: string } => {
+  const premium =
+    typeof packet.features.total_premium === "number" ? packet.features.total_premium : 0;
+  const premiumScore = Math.min(70, Math.round(premium / 1000));
+  const maxConfidence = hits.reduce((max, hit) => Math.max(max, hit.confidence), 0);
+  const confidenceScore = Math.round(maxConfidence * 20);
+  const hitScore = Math.min(20, hits.length * 5);
+  const score = Math.max(0, Math.min(100, premiumScore + confidenceScore + hitScore));
+  const severity = score >= 80 ? "high" : score >= 45 ? "medium" : "low";
+  return { score, severity };
+};
+
+const emitClassifiers = async (
+  clickhouse: ReturnType<typeof createClickHouseClient>,
+  js: Awaited<ReturnType<typeof connectJetStreamWithRetry>>["js"],
+  packet: FlowPacket
+): Promise<void> => {
+  const hits = evaluateClassifiers(packet, classifierConfig);
+  if (hits.length === 0) {
+    return;
+  }
+
+  const hitEvents: ClassifierHitEvent[] = hits.map((hit) =>
+    ClassifierHitEventSchema.parse({
+      source_ts: packet.source_ts,
+      ingest_ts: packet.ingest_ts,
+      seq: packet.seq,
+      trace_id: `classifier:${hit.classifier_id}:${packet.id}`,
+      ...hit
+    })
+  );
+
+  for (const hit of hitEvents) {
+    try {
+      await insertClassifierHit(clickhouse, hit);
+      await publishJson(js, SUBJECT_CLASSIFIER_HITS, hit);
+    } catch (error) {
+      logger.error("failed to emit classifier hit", {
+        error: error instanceof Error ? error.message : String(error),
+        classifier_id: hit.classifier_id,
+        packet_id: packet.id
+      });
+    }
+  }
+
+  const { score, severity } = scoreAlert(packet, hitEvents);
+  const alert: AlertEvent = AlertEventSchema.parse({
+    source_ts: packet.source_ts,
+    ingest_ts: packet.ingest_ts,
+    seq: packet.seq,
+    trace_id: `alert:${packet.id}`,
+    score,
+    severity,
+    hits: hitEvents.map((hit) => ({
+      classifier_id: hit.classifier_id,
+      confidence: hit.confidence,
+      direction: hit.direction,
+      explanations: hit.explanations
+    })),
+    evidence_refs: [packet.id, ...packet.members]
+  });
+
+  try {
+    await insertAlert(clickhouse, alert);
+    await publishJson(js, SUBJECT_ALERTS, alert);
+  } catch (error) {
+    logger.error("failed to emit alert", {
+      error: error instanceof Error ? error.message : String(error),
+      packet_id: packet.id
+    });
+  }
+};
+
 const flushEligibleClusters = async (
   clickhouse: ReturnType<typeof createClickHouseClient>,
   js: Awaited<ReturnType<typeof connectJetStreamWithRetry>>["js"],
@@ -232,6 +336,32 @@ const run = async () => {
     num_replicas: 1
   });
 
+  await ensureStream(jsm, {
+    name: STREAM_CLASSIFIER_HITS,
+    subjects: [SUBJECT_CLASSIFIER_HITS],
+    retention: "limits",
+    storage: "file",
+    discard: "old",
+    max_msgs_per_subject: -1,
+    max_msgs: -1,
+    max_bytes: -1,
+    max_age: 0,
+    num_replicas: 1
+  });
+
+  await ensureStream(jsm, {
+    name: STREAM_ALERTS,
+    subjects: [SUBJECT_ALERTS],
+    retention: "limits",
+    storage: "file",
+    discard: "old",
+    max_msgs_per_subject: -1,
+    max_msgs: -1,
+    max_bytes: -1,
+    max_age: 0,
+    num_replicas: 1
+  });
+
   const clickhouse = createClickHouseClient({
     url: env.CLICKHOUSE_URL,
     database: env.CLICKHOUSE_DATABASE
@@ -239,6 +369,8 @@ const run = async () => {
 
   await retry("clickhouse table init", 20, 500, async () => {
     await ensureFlowPacketsTable(clickhouse);
+    await ensureClassifierHitsTable(clickhouse);
+    await ensureAlertsTable(clickhouse);
   });
 
   const durableName = "compute-option-prints";