diff --git a/uptime.config.ts b/uptime.config.ts
index 00be288..1b354fd 100644
--- a/uptime.config.ts
+++ b/uptime.config.ts
@@ -1,4 +1,6 @@
-const pageConfig = {
+import type { PageConfig, UptimeConfig } from './uptime.types'
+
+const pageConfig: PageConfig = {
   // Title for your status page
   title: "lyc8503's Status Page",
   // Links shown at the header of your status page, could set `highlight` to `true`
@@ -9,7 +11,7 @@ const pageConfig = {
   ],
 }
 
-const workerConfig = {
+const workerConfig: UptimeConfig = {
   // Write KV at most every 3 minutes unless the status changed.
   kvWriteCooldownMinutes: 3,
   // Define all your monitors here
@@ -61,12 +63,12 @@ const workerConfig = {
   notification: {
     // [Optional] apprise API server URL
     // if not specified, no notification will be sent
-    appriseApiServer: "https://apprise.example.com/notify",
+    appriseApiServer: 'https://apprise.example.com/notify',
     // [Optional] recipient URL for apprise, refer to https://github.com/caronc/apprise
     // if not specified, no notification will be sent
-    recipientUrl: "tgram://bottoken/ChatID",
+    recipientUrl: 'tgram://bottoken/ChatID',
     // [Optional] timezone used in notification messages, default to "Etc/GMT"
-    timeZone: "Asia/Shanghai",
+    timeZone: 'Asia/Shanghai',
     // [Optional] grace period in minutes before sending a notification
     // notification will be sent only if the monitor is down for N continuous checks after the initial failure
     // if not specified, notification will be sent immediately
@@ -83,7 +85,6 @@ const workerConfig = {
     ) => {
       // This callback will be called when there's a status change for any monitor
       // Write any Typescript code here
-
       // This will not follow the grace period settings and will be called immediately when the status changes
       // You need to handle the grace period manually if you want to implement it
     },
diff --git a/uptime.types.ts b/uptime.types.ts
index aa1748b..1e2a734 100644
--- a/uptime.types.ts
+++ b/uptime.types.ts
@@ -1,4 +1,5 @@
-type MonitorState = {
+export type MonitorState = {
+  version: number
   lastUpdate: number
   overallUp: number
   overallDown: number
@@ -28,7 +29,7 @@ type MonitorState = {
   >
 }
 
-type MonitorTarget = {
+export type MonitorTarget = {
   id: string
   name: string
   method: string // "TCP_PING" or Http Method (e.g. GET, POST, OPTIONS, etc.)
@@ -45,4 +46,39 @@ type MonitorTarget = {
   responseKeyword?: string
 }
 
-export type { MonitorState, MonitorTarget }
+export type UptimeConfig = {
+  kvWriteCooldownMinutes: number
+  monitors: MonitorTarget[]
+  notification?: {
+    appriseApiServer?: string
+    recipientUrl?: string
+    timeZone?: string
+    gracePeriod?: number
+  }
+  callbacks?: {
+    onStatusChange?: (
+      env: any,
+      monitor: any,
+      isUp: boolean,
+      timeIncidentStart: number,
+      timeNow: number,
+      reason: string
+    ) => Promise<any>
+    onIncident?: (
+      env: any,
+      monitor: any,
+      timeIncidentStart: number,
+      timeNow: number,
+      reason: string
+    ) => Promise<any>
+  }
+}
+
+export type PageConfig = {
+  title: string
+  links: Array<{
+    link: string
+    label: string
+    highlight?: boolean
+  }>
+}
diff --git a/worker/src/index.ts b/worker/src/index.ts
index 3fe7478..a61bedc 100644
--- a/worker/src/index.ts
+++ b/worker/src/index.ts
@@ -1,41 +1,49 @@
 import { workerConfig } from '../../uptime.config'
 import { formatStatusChangeNotification, getWorkerLocation, notifyWithApprise } from './util'
 import { MonitorState } from '../../uptime.types'
-import { getStatus } from './monitor'
+import { getStatus, Status } from './monitor'
 
 export interface Env {
   UPTIMEFLARE_STATE: KVNamespace
 }
 
+interface CheckLocationWorkerResult {
+  location: string
+  status: Record<string, Status>
+}
+
 export default {
   async fetch(request: Request): Promise<Response> {
-    const workerLocation = request.cf?.colo
+    const workerLocation = request.cf?.colo as string
     console.log(`Handling request event at ${workerLocation}...`)
 
     if (request.method !== 'POST') {
       return new Response('Remote worker is working...', { status: 405 })
     }
 
-    const targetId = (await request.json<{ target: string }>())['target']
-    const target = workerConfig.monitors.find((m) => m.id === targetId)
+    const targetIds = new Set((await request.json<{ targets: string[] }>())['targets'])
+    const targets = workerConfig.monitors.filter(({ id }) => targetIds.has(id))
 
-    if (target === undefined) {
+    if (!targets.length) {
       return new Response('Target Not Found', { status: 404 })
     }
 
-    const status = await getStatus(target)
+    const status: Record<string, Status> = {}
 
-    return new Response(
-      JSON.stringify({
-        location: workerLocation,
-        status: status,
-      }),
-      {
-        headers: {
-          'content-type': 'application/json;charset=UTF-8',
-        },
-      }
-    )
+    for (const target of targets) {
+      status[target.id] = await getStatus(target)
+    }
+
+    const result: CheckLocationWorkerResult = {
+      location: workerLocation,
+      status,
+    }
+
+    return new Response(JSON.stringify(result), {
+      headers: {
+        'content-type': 'application/json;charset=UTF-8',
+      },
+    })
   },
 
   async scheduled(event: ScheduledEvent, env: Env, ctx: ExecutionContext): Promise<void> {
@@ -43,14 +51,14 @@ export default {
     console.log(`Running scheduled event on ${workerLocation}...`)
 
     // Auxiliary function to format notification and send it via apprise
-    let formatAndNotify = async (
+    const formatAndNotify = async (
       monitor: any,
       isUp: boolean,
       timeIncidentStart: number,
       timeNow: number,
       reason: string
     ) => {
-      if (workerConfig.notification?.appriseApiServer && workerConfig.notification?.recipientUrl) {
+      if (workerConfig.notification?.appriseApiServer && workerConfig.notification.recipientUrl) {
         const notification = formatStatusChangeNotification(
           monitor,
           isUp,
@@ -89,6 +97,33 @@ export default {
     let statusChanged = false
     const currentTimeSecond = Math.round(Date.now() / 1000)
 
+    // Check monitors with `checkLocationWorkerRoute`
+    const groupedCheckLocation = new Map<string, string[]>()
+    const groupedCheckLocationResult = new Map<string, CheckLocationWorkerResult>()
+    workerConfig.monitors.forEach(({ id, checkLocationWorkerRoute: url }) => {
+      if (!url) return
+      const targets = groupedCheckLocation.get(url) || []
+      if (!groupedCheckLocation.has(url)) {
+        groupedCheckLocation.set(url, targets)
+      }
+      targets.push(id)
+    })
+    for (const [url, targets] of groupedCheckLocation) {
+      // Initiate a check from a different location
+      console.log('Calling worker: ' + url)
+      try {
+        const resp = await (
+          await fetch(url, {
+            method: 'POST',
+            body: JSON.stringify({ targets }),
+          })
+        ).json<CheckLocationWorkerResult>()
+        groupedCheckLocationResult.set(url, resp)
+      } catch (err) {
+        console.log('Error calling worker: ' + err)
+      }
+    }
+
     // Check each monitor
     // TODO: concurrent status check
     for (const monitor of workerConfig.monitors) {
@@ -96,24 +131,16 @@ export default {
 
       let monitorStatusChanged = false
       let checkLocation = workerLocation
-      let status
+      let status: Status
 
       if (monitor.checkLocationWorkerRoute) {
-        // Initiate a check from a different location
-        try {
-          console.log('Calling worker: ' + monitor.checkLocationWorkerRoute)
-          const resp = await (
-            await fetch(monitor.checkLocationWorkerRoute, {
-              method: 'POST',
-              body: JSON.stringify({
-                target: monitor.id,
-              }),
-            })
-          ).json<{ location: string; status: { ping: number; up: boolean; err: string } }>()
-          checkLocation = resp.location
-          status = resp.status
-        } catch (err) {
-          console.log('Error calling worker: ' + err)
+        // Get check result from a different location
+        const result = groupedCheckLocationResult.get(monitor.checkLocationWorkerRoute)
+        const resultStatus = result?.status[monitor.id]
+        if (resultStatus) {
+          checkLocation = result.location
+          status = resultStatus
+        } else {
           status = { ping: 0, up: false, err: 'Error initiating check from remote worker' }
         }
       } else {
@@ -164,7 +191,7 @@ export default {
             }
 
             console.log('Calling config onStatusChange callback...')
-            await workerConfig.callbacks.onStatusChange(
+            await workerConfig.callbacks?.onStatusChange?.(
               env,
               monitor,
               true,
@@ -230,7 +257,7 @@ export default {
 
           if (monitorStatusChanged) {
             console.log('Calling config onStatusChange callback...')
-            await workerConfig.callbacks.onStatusChange(
+            await workerConfig.callbacks?.onStatusChange?.(
               env,
               monitor,
               false,
@@ -246,7 +273,7 @@ export default {
 
         try {
           console.log('Calling config onIncident callback...')
-          await workerConfig.callbacks.onIncident(
+          await workerConfig.callbacks?.onIncident?.(
             env,
             monitor,
             currentIncident.start[0],
diff --git a/worker/src/monitor.ts b/worker/src/monitor.ts
index 216c06e..4a4bbc6 100644
--- a/worker/src/monitor.ts
+++ b/worker/src/monitor.ts
@@ -2,9 +2,13 @@ import { connect } from "cloudflare:sockets";
 import { MonitorTarget } from "../../uptime.types";
 import { withTimeout, fetchTimeout } from "./util";
 
-export async function getStatus(
-  monitor: MonitorTarget
-): Promise<{ ping: number; up: boolean; err: string }> {
+export interface Status {
+  ping: number
+  up: boolean
+  err: string
+}
+
+export async function getStatus(monitor: MonitorTarget): Promise<Status> {
   let status = {
     ping: 0,
     up: false,