diff --git a/docs/bridge-integration/ALERTING.md b/docs/bridge-integration/ALERTING.md
new file mode 100644
index 000000000..712e8f18a
--- /dev/null
+++ b/docs/bridge-integration/ALERTING.md
@@ -0,0 +1,69 @@
+# Bridge Alerting (ENG-361)
+
+Operational alerting for the Bridge integration. When a Bridge signal fails
+(webhook processing, ERPNext audit write, or a Bridge API outage), the
+`AlertService` (`src/services/alerts`) fans the alert out to the configured
+destinations.
+
+## Routing
+
+| Severity     | PagerDuty (page) | Slack / Mattermost (inform) | Discord (inform) |
+| ------------ | :--------------: | :-------------------------: | :--------------: |
+| **critical** |        ✅        |             ✅              |        ✅        |
+| **warning**  |        —         |             ✅              |        ✅        |
+
+Delivery is best-effort and fire-and-forget — a failing or unconfigured
+destination never blocks or fails the webhook/request path. **A destination
+with no configured credential is silently skipped**, so channels can be enabled
+incrementally.
+
+## Alert sources
+
+| Source                                            | Severity | Where                                                       |
+| ------------------------------------------------- | -------- | ----------------------------------------------------------- |
+| ERPNext audit-write failure (deposit + transfer)  | critical | `services/bridge/webhook-server/routes/{deposit,transfer}.ts` |
+| Bridge webhook processing exception               | critical | same routes (catch block)                                   |
+| Bridge API outage — 5xx / timeout / network       | critical | `services/bridge/client.ts`                                 |
+| IBEX error on a Bridge↔IBEX movement              | warning  | _follow-up — not yet wired_                                 |
+
+`4xx` responses from Bridge are normal API rejections and are **not** alerted.
+
+## Configuration
+
+Three optional env vars, each gating one destination:
+
+| Env var                       | Destination         | Value                                       |
+| ----------------------------- | ------------------- | ------------------------------------------- |
+| `ALERT_PAGERDUTY_ROUTING_KEY` | PagerDuty           | Events API v2 **integration / routing key** |
+| `ALERT_SLACK_WEBHOOK_URL`     | Slack or Mattermost | Incoming-webhook URL                        |
+| `ALERT_DISCORD_WEBHOOK_URL`   | Discord             | Channel webhook URL                         |
+
+### How to get each value
+
+**PagerDuty** — `ALERT_PAGERDUTY_ROUTING_KEY`
+1. PagerDuty → **Services** → pick (or create) the service that should page for Bridge.
+2. **Integrations** → **Add integration** → **Events API v2**.
+3. Copy the **Integration Key** — that is the routing key.
+
+**Slack** — `ALERT_SLACK_WEBHOOK_URL`
+1. Create/choose a Slack app → **Incoming Webhooks** → **Activate**.
+2. **Add New Webhook to Workspace** → choose the target channel.
+3. Copy the URL (`https://hooks.slack.com/services/...`).
+   _Mattermost works too_ — it accepts the same `{ text }` payload; use its incoming-webhook URL.
+
+**Discord** — `ALERT_DISCORD_WEBHOOK_URL`
+1. Discord → target channel → **Edit Channel** → **Integrations** → **Webhooks**.
+2. **New Webhook** → name it → **Copy Webhook URL**.
+
+### Where to set them
+
+- **Local dev:** add to `.env` (and `.env.ci` for CI).
+- **Staging / production:** set as environment variables / secrets in the deployment — the same place `MATTERMOST_WEBHOOK_URL` is configured. Treat all three as **secrets**.
+
+> If none are set, alerting is a no-op (no errors, no delivery) — useful until the channels are provisioned.
+
+## Verifying in staging (ENG-361 acceptance)
+
+1. Set at least `ALERT_PAGERDUTY_ROUTING_KEY` and `ALERT_SLACK_WEBHOOK_URL` in staging.
+2. Simulate a Bridge webhook failure (e.g. force an ERPNext audit-write error, or replay a malformed transfer webhook).
+3. Confirm on-call is paged via PagerDuty **and** a message posts to Slack within ~1 minute.
diff --git a/src/config/env.ts b/src/config/env.ts
index 1216528c0..fe2397f8a 100644
--- a/src/config/env.ts
+++ b/src/config/env.ts
@@ -124,6 +124,10 @@ export const env = createEnv({
 
     MATTERMOST_WEBHOOK_URL: z.string().min(1).optional(),
 
+    ALERT_PAGERDUTY_ROUTING_KEY: z.string().min(1).optional(),
+    ALERT_SLACK_WEBHOOK_URL: z.string().url().optional(),
+    ALERT_DISCORD_WEBHOOK_URL: z.string().url().optional(),
+
     PROXY_CHECK_APIKEY: z.string().min(1).optional(),
 
     SVIX_SECRET: z.string().optional(),
@@ -231,6 +235,10 @@ export const env = createEnv({
 
     MATTERMOST_WEBHOOK_URL: process.env.MATTERMOST_WEBHOOK_URL,
 
+    ALERT_PAGERDUTY_ROUTING_KEY: process.env.ALERT_PAGERDUTY_ROUTING_KEY,
+    ALERT_SLACK_WEBHOOK_URL: process.env.ALERT_SLACK_WEBHOOK_URL,
+    ALERT_DISCORD_WEBHOOK_URL: process.env.ALERT_DISCORD_WEBHOOK_URL,
+
     PROXY_CHECK_APIKEY: process.env.PROXY_CHECK_APIKEY,
 
     SVIX_SECRET: process.env.SVIX_SECRET,
diff --git a/src/config/index.ts b/src/config/index.ts
index 2b070e1a0..749a0933f 100644
--- a/src/config/index.ts
+++ b/src/config/index.ts
@@ -188,6 +188,9 @@ export const NEXTCLOUD_URL = env.NEXTCLOUD_URL
 export const NEXTCLOUD_USER = env.NEXTCLOUD_USER
 export const NEXTCLOUD_PASSWORD = env.NEXTCLOUD_PASSWORD
 export const MATTERMOST_WEBHOOK_URL = env.MATTERMOST_WEBHOOK_URL
+export const ALERT_PAGERDUTY_ROUTING_KEY = env.ALERT_PAGERDUTY_ROUTING_KEY
+export const ALERT_SLACK_WEBHOOK_URL = env.ALERT_SLACK_WEBHOOK_URL
+export const ALERT_DISCORD_WEBHOOK_URL = env.ALERT_DISCORD_WEBHOOK_URL
 export const PROXY_CHECK_APIKEY = env.PROXY_CHECK_APIKEY
 export const NOSTR_PRIVATE_KEY = env.NOSTR_PRIVATE_KEY
 
diff --git a/src/services/alerts/discord.ts b/src/services/alerts/discord.ts
new file mode 100644
index 000000000..2dedb6c96
--- /dev/null
+++ b/src/services/alerts/discord.ts
@@ -0,0 +1,34 @@
+import { ALERT_DISCORD_WEBHOOK_URL } from "@config"
+import { ErrorLevel } from "@domain/shared"
+import { recordExceptionInCurrentSpan } from "@services/tracing"
+import axios from "axios"
+
+import { BridgeAlert } from "./index.types"
+
+// Discord caps message content at 2000 chars; leave headroom.
+const DISCORD_CONTENT_MAX = 1900
+
+// Discord incoming webhook ({ content }).
+export const sendDiscord = async (alert: BridgeAlert): Promise<void> => {
+  if (!ALERT_DISCORD_WEBHOOK_URL) return
+
+  const icon = alert.severity === "critical" ? "🚨" : "⚠️"
+  let content = `${icon} **Bridge alert** — ${alert.title}\nsource: \`${alert.source}\` · severity: \`${alert.severity}\``
+  if (alert.detail) content += `\n${alert.detail}`
+  if (alert.context) {
+    content += "\n```json\n" + JSON.stringify(alert.context, null, 2) + "\n```"
+  }
+  if (content.length > DISCORD_CONTENT_MAX) {
+    content = content.slice(0, DISCORD_CONTENT_MAX) + "…"
+  }
+
+  try {
+    await axios.post(
+      ALERT_DISCORD_WEBHOOK_URL,
+      { content },
+      { timeout: 5000, headers: { "Content-Type": "application/json" } },
+    )
+  } catch (error) {
+    recordExceptionInCurrentSpan({ error, level: ErrorLevel.Warn })
+  }
+}
diff --git a/src/services/alerts/index.ts b/src/services/alerts/index.ts
new file mode 100644
index 000000000..733dc7e7f
--- /dev/null
+++ b/src/services/alerts/index.ts
@@ -0,0 +1,27 @@
+import { sendPagerDuty } from "./pagerduty"
+import { sendSlack } from "./slack"
+import { sendDiscord } from "./discord"
+import { BridgeAlert } from "./index.types"
+
+export * from "./index.types"
+
+/**
+ * Fire-and-forget fan-out of a Bridge alert to the configured destinations
+ * (ENG-361). Returns immediately; delivery is best-effort — each sender catches
+ * its own errors and no-ops when its credential/URL is unset, so it never throws
+ * or rejects into the caller (no need to await or handle it).
+ *
+ * Routing:
+ *   - critical → page on-call (PagerDuty) + inform (Slack/Mattermost, Discord)
+ *   - warning  → inform (Slack/Mattermost, Discord) only
+ */
+export const alertBridge = (alert: BridgeAlert): void => {
+  const deliver = async () => {
+    const senders = [sendSlack(alert), sendDiscord(alert)]
+    if (alert.severity === "critical") {
+      senders.push(sendPagerDuty(alert))
+    }
+    await Promise.allSettled(senders)
+  }
+  deliver().catch(() => undefined)
+}
diff --git a/src/services/alerts/index.types.ts b/src/services/alerts/index.types.ts
new file mode 100644
index 000000000..1c6c5d651
--- /dev/null
+++ b/src/services/alerts/index.types.ts
@@ -0,0 +1,13 @@
+// Ops alerting for Bridge integration signals (ENG-361).
+
+export type AlertSeverity = "critical" | "warning"
+
+export type AlertSource = "bridge-webhook" | "bridge-api" | "ibex" | "erpnext-audit"
+
+export interface BridgeAlert {
+  source: AlertSource
+  severity: AlertSeverity
+  title: string
+  detail?: string
+  context?: Record<string, unknown>
+}
diff --git a/src/services/alerts/pagerduty.ts b/src/services/alerts/pagerduty.ts
new file mode 100644
index 000000000..da6acffcc
--- /dev/null
+++ b/src/services/alerts/pagerduty.ts
@@ -0,0 +1,33 @@
+import { ALERT_PAGERDUTY_ROUTING_KEY } from "@config"
+import { ErrorLevel } from "@domain/shared"
+import { recordExceptionInCurrentSpan } from "@services/tracing"
+import axios from "axios"
+
+import { BridgeAlert } from "./index.types"
+
+const PAGERDUTY_EVENTS_URL = "https://events.pagerduty.com/v2/enqueue"
+
+// PagerDuty Events API v2 — triggers a paging incident. "critical" and
+// "warning" are both valid PD payload severities, so we pass them through.
+export const sendPagerDuty = async (alert: BridgeAlert): Promise<void> => {
+  if (!ALERT_PAGERDUTY_ROUTING_KEY) return
+
+  try {
+    await axios.post(
+      PAGERDUTY_EVENTS_URL,
+      {
+        routing_key: ALERT_PAGERDUTY_ROUTING_KEY,
+        event_action: "trigger",
+        payload: {
+          summary: `[bridge:${alert.source}] ${alert.title}`,
+          severity: alert.severity,
+          source: "flash-bridge",
+          custom_details: { ...alert.context, detail: alert.detail },
+        },
+      },
+      { timeout: 5000, headers: { "Content-Type": "application/json" } },
+    )
+  } catch (error) {
+    recordExceptionInCurrentSpan({ error, level: ErrorLevel.Warn })
+  }
+}
diff --git a/src/services/alerts/slack.ts b/src/services/alerts/slack.ts
new file mode 100644
index 000000000..a4c9456f4
--- /dev/null
+++ b/src/services/alerts/slack.ts
@@ -0,0 +1,31 @@
+import { ALERT_SLACK_WEBHOOK_URL } from "@config"
+import { ErrorLevel } from "@domain/shared"
+import { recordExceptionInCurrentSpan } from "@services/tracing"
+import axios from "axios"
+
+import { BridgeAlert } from "./index.types"
+
+// Slack / Mattermost-compatible incoming webhook ({ text }).
+export const sendSlack = async (alert: BridgeAlert): Promise<void> => {
+  if (!ALERT_SLACK_WEBHOOK_URL) return
+
+  const icon = alert.severity === "critical" ? ":rotating_light:" : ":warning:"
+  const lines = [
+    `${icon} *Bridge alert* — ${alert.title}`,
+    `*source:* \`${alert.source}\`  *severity:* \`${alert.severity}\``,
+  ]
+  if (alert.detail) lines.push(alert.detail)
+  if (alert.context) {
+    lines.push("```" + JSON.stringify(alert.context, null, 2) + "```")
+  }
+
+  try {
+    await axios.post(
+      ALERT_SLACK_WEBHOOK_URL,
+      { text: lines.join("\n") },
+      { timeout: 5000, headers: { "Content-Type": "application/json" } },
+    )
+  } catch (error) {
+    recordExceptionInCurrentSpan({ error, level: ErrorLevel.Warn })
+  }
+}
diff --git a/src/services/bridge/client.ts b/src/services/bridge/client.ts
index 363e535bf..2494b2a51 100644
--- a/src/services/bridge/client.ts
+++ b/src/services/bridge/client.ts
@@ -8,6 +8,7 @@ import crypto from "crypto"
 import { BridgeConfig } from "@config"
 
 import { BridgeCustomerId, BridgeTransferId, BridgeVirtualAccountId } from "@domain/primitives/bridge"
+import { alertBridge } from "@services/alerts"
 import { BridgeTimeoutError } from "./errors"
 
 // ============ Error Handling ============
@@ -379,6 +380,16 @@ export class BridgeClient {
       const responseData = await response.json().catch(() => null)
 
       if (!response.ok) {
+        // Only 5xx indicates a Bridge-side outage; 4xx are normal API rejections.
+        if (response.status >= 500) {
+          alertBridge({
+            source: "bridge-api",
+            severity: "critical",
+            title: `Bridge API ${response.status} on ${method} ${path}`,
+            detail: response.statusText,
+            context: { method, path, status: response.status },
+          })
+        }
         throw new BridgeApiError(
           `Bridge API error: ${response.status} ${response.statusText}`,
           response.status,
@@ -389,8 +400,24 @@ export class BridgeClient {
       return responseData as T
     } catch (err) {
       if (err instanceof Error && err.name === "AbortError") {
+        alertBridge({
+          source: "bridge-api",
+          severity: "critical",
+          title: `Bridge API timeout on ${method} ${path}`,
+          context: { method, path, timeoutMs },
+        })
         throw new BridgeTimeoutError()
       }
+      // Network/connectivity failures (5xx already alerted above).
+      if (!(err instanceof BridgeApiError)) {
+        alertBridge({
+          source: "bridge-api",
+          severity: "critical",
+          title: `Bridge API request failed on ${method} ${path}`,
+          detail: err instanceof Error ? err.message : String(err),
+          context: { method, path },
+        })
+      }
       throw err
     } finally {
       clearTimeout(timeoutId)
diff --git a/src/services/bridge/webhook-server/routes/deposit.ts b/src/services/bridge/webhook-server/routes/deposit.ts
index 1105ac2be..36f6aed55 100644
--- a/src/services/bridge/webhook-server/routes/deposit.ts
+++ b/src/services/bridge/webhook-server/routes/deposit.ts
@@ -12,6 +12,7 @@ import { baseLogger } from "@services/logger"
 import { createBridgeDeposit } from "@services/mongoose/bridge-deposit-log"
 import { reconcileByTxHash } from "@services/bridge/reconciliation"
 import { writeBridgeDepositRequest } from "@services/frappe/BridgeTransferRequestWriter"
+import { alertBridge } from "@services/alerts"
 
 export const depositHandler = async (req: Request, res: Response) => {
   const { event_id, event_object } = req.body
@@ -87,6 +88,13 @@ export const depositHandler = async (req: Request, res: Response) => {
         { error: auditResult, event_id, id },
         "Failed to persist Bridge deposit ERPNext audit row",
       )
+      alertBridge({
+        source: "erpnext-audit",
+        severity: "critical",
+        title: "Bridge deposit ERPNext audit write failed",
+        detail: auditResult.message,
+        context: { event_id, transfer_id: id },
+      })
       return res.status(500).json({ error: "Failed to persist ERPNext audit row" })
     }
 
@@ -102,6 +110,13 @@ export const depositHandler = async (req: Request, res: Response) => {
     return res.status(200).json({ status: "success" })
   } catch (error) {
     baseLogger.error({ error, id, event_id }, "Error processing Bridge deposit webhook")
+    alertBridge({
+      source: "bridge-webhook",
+      severity: "critical",
+      title: "Bridge deposit webhook processing error",
+      detail: error instanceof Error ? error.message : String(error),
+      context: { event_id, transfer_id: id },
+    })
     return res.status(500).json({ error: "Internal server error" })
   }
 }
diff --git a/src/services/bridge/webhook-server/routes/transfer.ts b/src/services/bridge/webhook-server/routes/transfer.ts
index 88f00fad8..3ea8d3d2a 100644
--- a/src/services/bridge/webhook-server/routes/transfer.ts
+++ b/src/services/bridge/webhook-server/routes/transfer.ts
@@ -13,6 +13,7 @@ import {
   writeBridgeCashoutCompleted,
   writeBridgeCashoutFailed,
 } from "@services/frappe/BridgeTransferRequestWriter"
+import { alertBridge } from "@services/alerts"
 
 const TERMINAL_FAILURE_STATES = new Set([
   "undeliverable",
@@ -121,6 +122,13 @@ export const transferHandler = async (req: Request, res: Response) => {
           { transfer_id, error: auditResult },
           "Failed to persist Bridge transfer ERPNext audit row",
         )
+        alertBridge({
+          source: "erpnext-audit",
+          severity: "critical",
+          title: "Bridge transfer ERPNext audit write failed",
+          detail: auditResult.message,
+          context: { transfer_id, event },
+        })
         return res.status(500).json({ error: "Failed to persist ERPNext audit row" })
       }
 
@@ -196,6 +204,13 @@ export const transferHandler = async (req: Request, res: Response) => {
           { transfer_id, error: auditResult },
           "Failed to persist Bridge transfer failure ERPNext audit row",
         )
+        alertBridge({
+          source: "erpnext-audit",
+          severity: "critical",
+          title: "Bridge transfer-failure ERPNext audit write failed",
+          detail: auditResult.message,
+          context: { transfer_id, event },
+        })
         return res.status(500).json({ error: "Failed to persist ERPNext audit row" })
       }
 
@@ -216,6 +231,13 @@ export const transferHandler = async (req: Request, res: Response) => {
     return res.status(200).json({ status: "success" })
   } catch (error) {
     baseLogger.error({ error, transfer_id }, "Error processing Bridge transfer webhook")
+    alertBridge({
+      source: "bridge-webhook",
+      severity: "critical",
+      title: "Bridge transfer webhook processing error",
+      detail: error instanceof Error ? error.message : String(error),
+      context: { transfer_id, event },
+    })
     return res.status(500).json({ error: "Internal server error" })
   }
 }