diff --git a/packages/core/src/dealer/deal-monitor-alert-tick.js b/packages/core/src/dealer/deal-monitor-alert-tick.js
new file mode 100644
index 0000000..c81aae1
--- /dev/null
+++ b/packages/core/src/dealer/deal-monitor-alert-tick.js
@@ -0,0 +1,143 @@
+/**
+ * @typedef {import('@web3-storage/data-segment').PieceLink} PieceLink
+ * @typedef {import('@web3-storage/filecoin-api/aggregator/api').AggregateStore} AggregatorAggregateStore
+ * @typedef {import('@web3-storage/filecoin-api/dealer/api').AggregateStore} DealerAggregateStore
+ * @typedef {import('@web3-storage/filecoin-api/dealer/api').AggregateRecord} AggregateRecord
+ * 
+ * @typedef {object} MonitorContext
+ * @property {AggregatorAggregateStore} context.aggregatorAggregateStore
+ * @property {DealerAggregateStore} context.dealerAggregateStore
+ * @property {number} context.oldestPieceAlertThresholdMs
+ * @property {number} context.oldestPieceWarnThresholdMs
+ * @property {number} context.aggregateMonitorThresholdMs
+ * 
+ * @typedef {Object} Notification
+ * @property {PieceLink} aggregate
+ * @property {number} duration
+ */
+
+/**
+ * On CRON tick, get aggregates without deals, and verify if there 
+ * 
+ * @param {MonitorContext} context
+ */
+export async function dealMonitorAlertTick (context) {
+  // TODO: URL, ...
+
+  // Get offered deals pending approval/rejection
+  const offeredAggregates = await context.dealerAggregateStore.query({
+    status: 'offered',
+  })
+  if (offeredAggregates.error) {
+    return {
+      error: offeredAggregates.error,
+    }
+  }
+
+  // Get offered aggregates to monitor
+  const offeredAggregatesToMonitor = []
+  const currentTime = Date.now()
+  for (const offeredAggregate of offeredAggregates.ok) {
+    const offerTime = (new Date(offeredAggregate.insertedAt)).getTime()
+    // Monitor if offer time + monitor threshold is bigger than current time
+    if (offerTime + context.aggregateMonitorThresholdMs > currentTime) {
+      offeredAggregatesToMonitor.push(offeredAggregate)
+    }
+  }
+
+  // Get aggregates duration
+  const monitoredAggregatesResponse = await Promise.all(
+    offeredAggregatesToMonitor.map(aggregate => monitorAggregate(aggregate, context))
+  )
+  // Fail if any failed to get information
+  const monitoredAggregatesErrorResponse = monitoredAggregatesResponse.find(r => r?.error)
+  if (monitoredAggregatesErrorResponse) {
+    return {
+      error: monitoredAggregatesErrorResponse.error
+    }
+  }
+
+  const toWarn = /** @typedef {Notification[]} */ ([])
+  const toAlert = /** @typedef {Notification[]} */ ([])
+
+  // Verify if monitored aggregates should create notifications
+  for (const res of monitoredAggregatesResponse) {
+    // @ts-ignore if not ok, should have failed before
+    const duration = /** @type {number} */ (res.ok?.duration)
+    // @ts-ignore if not ok, should have failed before
+    const aggregate = /** @type {import('@web3-storage/data-segment').PieceLink} */ (res.ok?.aggregate)
+
+    if (duration > context.oldestPieceAlertThresholdMs) {
+      toAlert.push({
+        aggregate,
+        duration
+      })
+    } else if (duration > context.oldestPieceWarnThresholdMs) {
+      toWarn.push({
+        aggregate,
+        duration
+      })
+    }
+  }
+
+  // Send alerts
+  
+
+  return {
+    ok: {}
+  }
+}
+
+/**
+ * @param {AggregateRecord} aggregateRecord
+ * @param {MonitorContext} context
+ */
+async function monitorAggregate (aggregateRecord, context) {
+  const getAggregateInfo = await context.aggregatorAggregateStore.get({
+    aggregate: aggregateRecord.aggregate
+  })
+  if (getAggregateInfo.error) {
+    return {
+      error: getAggregateInfo.error
+    }
+  }
+
+  // Get aggregate current duration
+  const currentTime = Date.now()
+  // @ts-expect-error needs updated dep
+  const offerTime = (new Date(getAggregateInfo.ok.oldestPieceInsertedAt)).getTime()
+
+  return {
+    ok: {
+      aggregate: aggregateRecord.aggregate,
+      duration: currentTime - offerTime
+    }
+  }
+
+  // // Verify if already in alert threshold
+  // if (offerTime + context.oldestPieceAlertThresholdMs > currentTime) {
+  //   return {
+  //     ok: {
+  //       alert: {
+  //         aggregate: aggregateRecord.aggregate,
+  //         duration: currentTime - offerTime
+  //       }
+  //     }
+  //   }
+  // // Verify if already in warn threshold
+  // } else if (offerTime + context.oldestPieceWarnThresholdMs > currentTime) {
+  //   return {
+  //     ok: {
+  //       warn: {
+  //         aggregate: aggregateRecord.aggregate,
+  //         duration: currentTime - offerTime
+  //       }
+  //     }
+  //   }
+  // }
+  // return {
+  //   ok: {
+
+  //   }
+  // }
+}
diff --git a/packages/functions/src/monitor/handle-deal-monitor-alert-cron-tick.js b/packages/functions/src/monitor/handle-deal-monitor-alert-cron-tick.js
new file mode 100644
index 0000000..e7648e1
--- /dev/null
+++ b/packages/functions/src/monitor/handle-deal-monitor-alert-cron-tick.js
@@ -0,0 +1,76 @@
+import * as Sentry from '@sentry/serverless'
+import { Table } from 'sst/node/table'
+
+// store clients
+import { createClient as createAggregatorAggregateStoreClient } from '@w3filecoin/core/src/store/aggregator-aggregate-store.js'
+import { createClient as createDealerAggregateStoreClient } from '@w3filecoin/core/src/store/dealer-aggregate-store.js'
+
+import { dealMonitorAlertTick } from '@w3filecoin/core/src/dealer/deal-monitor-alert-tick.js'
+
+import { mustGetEnv } from '../utils.js'
+
+Sentry.AWSLambda.init({
+  environment: process.env.SST_STAGE,
+  dsn: process.env.SENTRY_DSN,
+  tracesSampleRate: 1.0,
+})
+
+async function handleEvent () {
+  const {
+    aggregatorAggregateStoreTableName,
+    aggregatorAggregateStoreTableRegion,
+    dealerAggregateStoreTableName,
+    dealerAggregateStoreTableRegion,
+    oldestPieceAlertThresholdMs,
+    oldestPieceWarnThresholdMs,
+    aggregateMonitorThresholdMs
+  } = getEnv()
+
+  // stores
+  const aggregatorAggregateStore = createAggregatorAggregateStoreClient(
+    { region: aggregatorAggregateStoreTableRegion },
+    { tableName: aggregatorAggregateStoreTableName.tableName }
+  )
+  const dealerAggregateStore = createDealerAggregateStoreClient({
+    region: dealerAggregateStoreTableRegion
+  }, {
+    tableName: dealerAggregateStoreTableName.tableName
+  })
+
+  const { error } = await dealMonitorAlertTick({
+    aggregatorAggregateStore,
+    dealerAggregateStore,
+    oldestPieceAlertThresholdMs,
+    oldestPieceWarnThresholdMs,
+    aggregateMonitorThresholdMs
+  })
+
+  if (error) {
+    console.error(error)
+    return {
+      statusCode: 500,
+      body: error.message
+    }
+  }
+
+  return {
+    statusCode: 200,
+  }
+}
+
+/**
+ * Get Env validating it is set.
+ */
+function getEnv () {
+  return {
+    aggregatorAggregateStoreTableName: Table['aggregator-aggregate-store'],
+    aggregatorAggregateStoreTableRegion: mustGetEnv('AWS_REGION'),
+    dealerAggregateStoreTableName: Table['dealer-aggregate-store'],
+    dealerAggregateStoreTableRegion: mustGetEnv('AWS_REGION'),
+    oldestPieceAlertThresholdMs: parseInt(mustGetEnv('OLDEST_PIECE_ALERT_THRESHOLD_MS')),
+    oldestPieceWarnThresholdMs: parseInt(mustGetEnv('OLDEST_PIECE_WARN_THRESHOLD_MS')),
+    aggregateMonitorThresholdMs: parseInt(mustGetEnv('AGGREGATE_MONITOR_THRESHOLD_MS')),
+  }
+}
+
+export const main = Sentry.AWSLambda.wrapHandler(handleEvent)
diff --git a/stacks/api-stack.js b/stacks/api-stack.js
index 5a876f8..d4aa573 100644
--- a/stacks/api-stack.js
+++ b/stacks/api-stack.js
@@ -1,4 +1,4 @@
-import { Api, Config, use } from 'sst/constructs'
+import { Api, Config, Cron, use } from 'sst/constructs'
 
 import { DataStack } from './data-stack.js'
 import { AggregatorStack } from './aggregator-stack.js'
@@ -6,10 +6,12 @@ import {
   getApiPackageJson,
   getGitInfo,
   getCustomDomain,
+  getEnv,
   getAggregatorEnv,
   getDealerEnv,
   getDealTrackerEnv,
-  setupSentry
+  setupSentry,
+  getResourceName
 } from './config.js'
 
 /**
@@ -30,6 +32,11 @@ export function ApiStack({ app, stack }) {
     DEAL_API_HOSTED_ZONE,
     DEALER_DID,
   } = getDealerEnv()
+  const {
+    OLDEST_PIECE_ALERT_THRESHOLD_MS,
+    OLDEST_PIECE_WARN_THRESHOLD_MS,
+    AGGREGATE_MONITOR_THRESHOLD_MS
+  } = getEnv()
 
   // Setup app monitoring with Sentry
   setupSentry(app, stack)
@@ -174,6 +181,27 @@ export function ApiStack({ app, stack }) {
     },
   })
 
+  // Setup `monitoring`
+  const dealMonitorAlertCronName = getResourceName('deal-monitor-alert-cron', stack.stage)
+  new Cron(stack, dealMonitorAlertCronName, {
+    schedule: 'rate(30 minutes)',
+    job: {
+      function: {
+        timeout: '5 minutes',
+        handler: 'packages/functions/src/monitor/handle-deal-monitor-alert-cron-tick.main',
+        environment: {
+          OLDEST_PIECE_ALERT_THRESHOLD_MS,
+          OLDEST_PIECE_WARN_THRESHOLD_MS,
+          AGGREGATE_MONITOR_THRESHOLD_MS
+        },
+        bind: [
+          dealerAggregateStoreTable,
+          aggregatorAggregateStoreTable,
+        ],
+      }
+    }
+  })
+
   stack.addOutputs({
     AggregatorApiEndpoint: api.url,
     AggregatorApiCustomDomain: aggregatorApiCustomDomain ? `https://${aggregatorApiCustomDomain.domainName}` : 'Set AGGREGATOR_HOSTED_ZONE in env to deploy to a custom domain',
diff --git a/stacks/config.js b/stacks/config.js
index 539b5a8..432c6bf 100644
--- a/stacks/config.js
+++ b/stacks/config.js
@@ -2,8 +2,12 @@ import { RemovalPolicy } from 'aws-cdk-lib'
 import git from 'git-rev-sync'
 import * as pack from '../package.json'
 
-export const DEFAULT_FERRY_CARGO_MAX_SIZE = 127*(1<<28)
-export const DEFAULT_FERRY_CARGO_MIN_SIZE = 1+127*(1<<27)
+// 72 Hours
+export const DEFAULT_OLDEST_PIECE_ALERT_THRESHOLD_MS = String(72 * 60 * 60 * 1000)
+// 60 Hours
+export const DEFAULT_OLDEST_PIECE_WARN_THRESHOLD_MS = String(60 * 60 * 60 * 1000)
+// 48 Hours
+export const DEFAULT_AGGREGATE_MONITOR_THRESHOLD_MS = String(48 * 60 * 60 * 1000)
 
 /**
  * Get nicer resources name
@@ -105,7 +109,10 @@ export function setupSentry (app, stack) {
 export function getEnv() {
   return {
     SENTRY_DSN: mustGetEnv('SENTRY_DSN'),
-    UCAN_LOG_URL: mustGetEnv('UCAN_LOG_URL')
+    UCAN_LOG_URL: mustGetEnv('UCAN_LOG_URL'),
+    OLDEST_PIECE_ALERT_THRESHOLD_MS: process.env.OLDEST_PIECE_ALERT_THRESHOLD_MS || DEFAULT_OLDEST_PIECE_ALERT_THRESHOLD_MS,
+    OLDEST_PIECE_WARN_THRESHOLD_MS: process.env.OLDEST_PIECE_WARN_THRESHOLD_MS || DEFAULT_OLDEST_PIECE_WARN_THRESHOLD_MS,
+    AGGREGATE_MONITOR_THRESHOLD_MS: process.env.AGGREGATE_MONITOR_THRESHOLD_MS || DEFAULT_AGGREGATE_MONITOR_THRESHOLD_MS
   }
 }