diff --git a/.github/workflows/pr_action.yml b/.github/workflows/pr_action.yml
index d8adfb1..2d5bbf5 100644
--- a/.github/workflows/pr_action.yml
+++ b/.github/workflows/pr_action.yml
@@ -19,6 +19,23 @@ jobs:
                   yarn
                   yarn test
               working-directory: ./
+    run_style_check:
+        name: Code Style Check
+        runs-on: ubuntu-latest
+        strategy:
+            matrix:
+                node-version: [16.x]
+        steps:
+            - uses: actions/checkout@v2
+            - name: Use Node.js ${{ matrix.node-version }}
+              uses: actions/setup-node@v2
+              with:
+                  node-version: ${{ matrix.node-version }}
+            - name: check_style
+              run: |
+                  yarn
+                  yarn lint:check
+              working-directory: ./
     build_code:
         name: Build Check
         runs-on: ubuntu-latest
diff --git a/.prettierrc.js b/.prettierrc.js
index 9277095..c8c6a54 100644
--- a/.prettierrc.js
+++ b/.prettierrc.js
@@ -1,7 +1,7 @@
 module.exports = {
-  semi: true,
-  trailingComma: "all",
-  singleQuote: true,
-  printWidth: 120,
-  tabWidth: 4,
+    semi: true,
+    trailingComma: 'all',
+    singleQuote: true,
+    printWidth: 120,
+    tabWidth: 4,
 };
diff --git a/README.md b/README.md
index d702d7b..cbcf4af 100644
--- a/README.md
+++ b/README.md
@@ -10,14 +10,22 @@ You can do this by creating a `.env` file with the following variables.
 ```env
 # Bot user app token
 DISCORD_APP_TOKEN=<bot token>
+
 # Bot user client ID
 DISCORD_APP_CLIENT_ID=<app id>
+
 # Server ID for the bot to be installed
 DISCORD_GUILD_ID=<guild id>
+
 # The channel ID for the bot to listen to
 DISCORD_FAUCET_CHANNEL_ID=<channel id>
+
 # Secret phrase (mnemonic) for the faucet account
 FAUCET_SECRET_PHRASE=<secret phrase>
+
+# Redis URL in URL format
+# In Heroku, this is automatically set when you add the Redis add-on to your app.
+REDIS_URL=<redis://[:password@]host[:port][/db-number][?option=value]>
 ```
 
 ### Scripts
diff --git a/package.json b/package.json
index 91032d7..8f3f2d7 100644
--- a/package.json
+++ b/package.json
@@ -27,8 +27,8 @@
         "serve": "node build/index.js",
         "dev": "ts-node-dev -r dotenv/config src/index.ts",
         "build": "tsc --project tsconfig.json",
-        "lint": "eslint '*/**/*.{js,ts}' --quiet --fix",
-        "lint:check": "eslint '*/**/*.{js,ts}'",
+        "lint": "eslint '*/**/*.{js,ts}' --quiet --fix && prettier -w .",
+        "lint:check": "eslint '*/**/*.{js,ts}' && prettier -c .",
         "test": "NODE_ENV=test echo \"Test not implemented\"!"
     },
     "engines": {
@@ -37,6 +37,7 @@
     "license": "MIT",
     "devDependencies": {
         "@types/express": "^4.17.13",
+        "@types/ioredis": "^4.28.1",
         "@types/jest": "^27.0.1",
         "@types/node": "^16.9.3",
         "@types/node-fetch": "2.5.10",
@@ -63,6 +64,7 @@
         "@polkadot/util-crypto": "^7.4.1",
         "discord-api-types": "^0.23.1",
         "discord.js": "^13.1.0",
-        "express": "^4.17.1"
+        "express": "^4.17.1",
+        "ioredis": "^4.28.0"
     }
 }
diff --git a/src/app.ts b/src/app.ts
index d207139..3dcb142 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -6,6 +6,8 @@ import {
     NetworkName,
     ASTAR_TOKEN_DECIMALS,
 } from './clients';
+import { canRequestFaucet, logRequest } from './middlewares';
+
 import { DISCORD_APP_TOKEN, DISCORD_APP_CLIENT_ID, DISCORD_GUILD_ID, DISCORD_FAUCET_CHANNEL_ID } from './config';
 import { Client, Intents, Interaction } from 'discord.js';
 import BN from 'bn.js';
@@ -73,9 +75,15 @@ const discordFaucetApp = async (appCred: DiscordCredentials) => {
                     throw new Error('No address was given!');
                 }
 
-                // todo: check if the user has already requested tokens or not
+                // Send 'Waiting' message to the user
                 await interaction.deferReply();
 
+                // Check if the user has already requested tokens or not
+                const requesterId = interaction.user.id;
+                const now = Date.now();
+                await canRequestFaucet(requesterId, now);
+
+                // Send token to the requester
                 console.log(`Sending ${astarApi.formatBalance(dripAmount)} to ${address}`);
 
                 await astarApi.sendTokenTo(address);
@@ -87,6 +95,9 @@ const discordFaucetApp = async (appCred: DiscordCredentials) => {
                         astarApi.faucetAccount.address
                     }\``,
                 );
+
+                // Log the faucet request.
+                await logRequest(requesterId, now);
             } catch (err) {
                 console.warn(err);
                 await interaction.editReply({ content: `${err}` });
diff --git a/src/config/appConfig.json b/src/config/appConfig.json
index 8edd733..d56b815 100644
--- a/src/config/appConfig.json
+++ b/src/config/appConfig.json
@@ -2,28 +2,33 @@
     "discord": {
         "scope": ["bot", "applications.commands"],
         "permissions": 2147551232,
-        "slashCommands": [{
-            "name": "drip",
-            "type": 1,
-            "description": "Receive a testnet token from the faucet",
-            "options": [{
-                    "name": "network",
-                    "description": "The name of the testnet",
-                    "type": 3,
-                    "required": true,
-                    "choices": [{
-                        "name": "Shibuya",
-                        "value": "shibuya"
-                    }]
-                },
-                {
-                    "name": "address",
-                    "description": "Your SS58 (Substrate) or H160 (EVM) public address for receiving the token",
-                    "type": 3,
-                    "required": true
-                }
-            ]
-        }]
+        "slashCommands": [
+            {
+                "name": "drip",
+                "type": 1,
+                "description": "Receive a testnet token from the faucet",
+                "options": [
+                    {
+                        "name": "network",
+                        "description": "The name of the testnet",
+                        "type": 3,
+                        "required": true,
+                        "choices": [
+                            {
+                                "name": "Shibuya",
+                                "value": "shibuya"
+                            }
+                        ]
+                    },
+                    {
+                        "name": "address",
+                        "description": "Your SS58 (Substrate) or H160 (EVM) public address for receiving the token",
+                        "type": 3,
+                        "required": true
+                    }
+                ]
+            }
+        ]
     },
 
     "network": {
@@ -137,8 +142,7 @@
                     "rewards": "Balance",
                     "staked": "Balance"
                 }
-
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/middlewares/index.ts b/src/middlewares/index.ts
new file mode 100644
index 0000000..7a44874
--- /dev/null
+++ b/src/middlewares/index.ts
@@ -0,0 +1 @@
+export * from './requestFilter';
diff --git a/src/middlewares/requestFilter.ts b/src/middlewares/requestFilter.ts
new file mode 100644
index 0000000..01415ba
--- /dev/null
+++ b/src/middlewares/requestFilter.ts
@@ -0,0 +1,28 @@
+import Redis from 'ioredis';
+
+const redis = new Redis(process.env.REDIS_URL);
+
+// Cooldown time in millisecond.
+// The requester must wait for Cooldown time to request next faucet.
+const cooldownTimeMillisecond = 60 * 60 * 1000;
+
+// Check whether the requester can request Faucet or not based on the last request time.
+export const canRequestFaucet = async (requesterId: string, now: number): Promise<void> => {
+    const lastRequestAt = Number(await redis.get(requesterId));
+    const elapsedTimeFromLastRequest = now - lastRequestAt;
+
+    // If lastReuqest was made within the cooldown time, the requester cannot request.
+    if (cooldownTimeMillisecond > elapsedTimeFromLastRequest) {
+        const untilNextRequestMillisec = cooldownTimeMillisecond - elapsedTimeFromLastRequest;
+        const untilNextRequestMin = Math.floor(untilNextRequestMillisec / 1000 / 60);
+        const untilNextRequestSec = Math.floor(untilNextRequestMillisec / 1000 - untilNextRequestMin * 60);
+
+        const replyMessage = `You already requested the Faucet. Try again in ${untilNextRequestMin} mins ${untilNextRequestSec} secs.`;
+        throw new Error(replyMessage);
+    }
+};
+
+// Log the Faucet request on Redis
+export const logRequest = async (requesterId: string, now: number): Promise<void> => {
+    await redis.set(requesterId, now, 'PX', cooldownTimeMillisecond);
+};
diff --git a/yarn.lock b/yarn.lock
index 5ba559a..3b9b4c4 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -954,6 +954,13 @@
   dependencies:
     "@types/node" "*"
 
+"@types/ioredis@^4.28.1":
+  version "4.28.1"
+  resolved "https://registry.yarnpkg.com/@types/ioredis/-/ioredis-4.28.1.tgz#27d66f4c0540145826d984b6d0a5b54bbb88c32a"
+  integrity sha512-raYHPqRWrfnEoym94BY28mG1+tcZqh3dsp2q7x5IyMAAEvIdu+H0X8diASMpncIm+oHyH9dalOeOnGOL/YnuOA==
+  dependencies:
+    "@types/node" "*"
+
 "@types/istanbul-lib-coverage@*", "@types/istanbul-lib-coverage@^2.0.0", "@types/istanbul-lib-coverage@^2.0.1":
   version "2.0.3"
   resolved "https://registry.yarnpkg.com/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.3.tgz#4ba8ddb720221f432e443bd5f9117fd22cfd4762"
@@ -1571,6 +1578,11 @@ cliui@^7.0.2:
     strip-ansi "^6.0.0"
     wrap-ansi "^7.0.0"
 
+cluster-key-slot@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/cluster-key-slot/-/cluster-key-slot-1.1.0.tgz#30474b2a981fb12172695833052bc0d01336d10d"
+  integrity sha512-2Nii8p3RwAPiFwsnZvukotvow2rIHM+yQ6ZcBXGHdniadkYGZYiGmkHJIbZPIV9nfv7m/U1IPMVVcAhoWFeklw==
+
 co@^4.6.0:
   version "4.6.0"
   resolved "https://registry.yarnpkg.com/co/-/co-4.6.0.tgz#6ea6bdf3d853ae54ccb8e47bfa0bf3f9031fb184"
@@ -1754,6 +1766,11 @@ delayed-stream@~1.0.0:
   resolved "https://registry.yarnpkg.com/delayed-stream/-/delayed-stream-1.0.0.tgz#df3ae199acadfb7d440aaae0b29e2272b24ec619"
   integrity sha1-3zrhmayt+31ECqrgsp4icrJOxhk=
 
+denque@^1.1.0:
+  version "1.5.1"
+  resolved "https://registry.yarnpkg.com/denque/-/denque-1.5.1.tgz#07f670e29c9a78f8faecb2566a1e2c11929c5cbf"
+  integrity sha512-XwE+iZ4D6ZUB7mfYRMb5wByE8L74HCn30FBN7sWnXksWc1LO1bPDl67pBR9o/kC4z/xSNAwkMYcGgqDV3BE3Hw==
+
 depd@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/depd/-/depd-1.1.2.tgz#9bcd52e14c097763e749b274c4346ed2e560b5a9"
@@ -2550,6 +2567,23 @@ inherits@2.0.3:
   resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.3.tgz#633c2c83e3da42a502f52466022480f4208261de"
   integrity sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=
 
+ioredis@^4.28.0:
+  version "4.28.0"
+  resolved "https://registry.yarnpkg.com/ioredis/-/ioredis-4.28.0.tgz#5a2be3f37ff2075e2332f280eaeb02ab4d9ff0d3"
+  integrity sha512-I+zkeeWp3XFgPT2CtJKxvaF5FjGBGt4yGYljRjQecdQKteThuAsKqffeF1lgHVlYnuNeozRbPOCDNZ7tDWPeig==
+  dependencies:
+    cluster-key-slot "^1.1.0"
+    debug "^4.3.1"
+    denque "^1.1.0"
+    lodash.defaults "^4.2.0"
+    lodash.flatten "^4.4.0"
+    lodash.isarguments "^3.1.0"
+    p-map "^2.1.0"
+    redis-commands "1.7.0"
+    redis-errors "^1.2.0"
+    redis-parser "^3.0.0"
+    standard-as-callback "^2.1.0"
+
 ip-regex@^4.3.0:
   version "4.3.0"
   resolved "https://registry.yarnpkg.com/ip-regex/-/ip-regex-4.3.0.tgz#687275ab0f57fa76978ff8f4dddc8a23d5990db5"
@@ -3218,6 +3252,21 @@ lodash.clonedeep@^4.5.0:
   resolved "https://registry.yarnpkg.com/lodash.clonedeep/-/lodash.clonedeep-4.5.0.tgz#e23f3f9c4f8fbdde872529c1071857a086e5ccef"
   integrity sha1-4j8/nE+Pvd6HJSnBBxhXoIblzO8=
 
+lodash.defaults@^4.2.0:
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/lodash.defaults/-/lodash.defaults-4.2.0.tgz#d09178716ffea4dde9e5fb7b37f6f0802274580c"
+  integrity sha1-0JF4cW/+pN3p5ft7N/bwgCJ0WAw=
+
+lodash.flatten@^4.4.0:
+  version "4.4.0"
+  resolved "https://registry.yarnpkg.com/lodash.flatten/-/lodash.flatten-4.4.0.tgz#f31c22225a9632d2bbf8e4addbef240aa765a61f"
+  integrity sha1-8xwiIlqWMtK7+OSt2+8kCqdlph8=
+
+lodash.isarguments@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/lodash.isarguments/-/lodash.isarguments-3.1.0.tgz#2f573d85c6a24289ff00663b491c1d338ff3458a"
+  integrity sha1-L1c9hcaiQon/AGY7SRwdM4/zRYo=
+
 lodash.isequal@^4.5.0:
   version "4.5.0"
   resolved "https://registry.yarnpkg.com/lodash.isequal/-/lodash.isequal-4.5.0.tgz#415c4478f2bcc30120c22ce10ed3226f7d3e18e0"
@@ -3525,6 +3574,11 @@ p-locate@^4.1.0:
   dependencies:
     p-limit "^2.2.0"
 
+p-map@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/p-map/-/p-map-2.1.0.tgz#310928feef9c9ecc65b68b17693018a665cea175"
+  integrity sha512-y3b8Kpd8OAN444hxfBbFfj1FY/RjtTd8tzYwhUqNYXx0fXx2iX4maP4Qr6qhIKbQXI02wTLAda4fYUbDagTUFw==
+
 p-try@^2.0.0:
   version "2.2.0"
   resolved "https://registry.yarnpkg.com/p-try/-/p-try-2.2.0.tgz#cb2868540e313d61de58fafbe35ce9004d5540e6"
@@ -3710,6 +3764,23 @@ readdirp@~3.6.0:
   dependencies:
     picomatch "^2.2.1"
 
+redis-commands@1.7.0:
+  version "1.7.0"
+  resolved "https://registry.yarnpkg.com/redis-commands/-/redis-commands-1.7.0.tgz#15a6fea2d58281e27b1cd1acfb4b293e278c3a89"
+  integrity sha512-nJWqw3bTFy21hX/CPKHth6sfhZbdiHP6bTawSgQBlKOVRG7EZkfHbbHwQJnrE4vsQf0CMNE+3gJ4Fmm16vdVlQ==
+
+redis-errors@^1.0.0, redis-errors@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/redis-errors/-/redis-errors-1.2.0.tgz#eb62d2adb15e4eaf4610c04afe1529384250abad"
+  integrity sha1-62LSrbFeTq9GEMBK/hUpOEJQq60=
+
+redis-parser@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/redis-parser/-/redis-parser-3.0.0.tgz#b66d828cdcafe6b4b8a428a7def4c6bcac31c8b4"
+  integrity sha1-tm2CjNyv5rS4pCin3vTGvKwxyLQ=
+  dependencies:
+    redis-errors "^1.0.0"
+
 regenerator-runtime@^0.13.4:
   version "0.13.9"
   resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.13.9.tgz#8925742a98ffd90814988d7566ad30ca3b263b52"
@@ -3948,6 +4019,11 @@ stack-utils@^2.0.3:
   dependencies:
     escape-string-regexp "^2.0.0"
 
+standard-as-callback@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/standard-as-callback/-/standard-as-callback-2.1.0.tgz#8953fc05359868a77b5b9739a665c5977bb7df45"
+  integrity sha512-qoRRSyROncaz1z0mvYqIE4lCd9p2R90i6GxW3uZv5ucSu8tU7B5HXUP1gG8pVZsYNVaXjk8ClXHPttLyxAL48A==
+
 "statuses@>= 1.5.0 < 2", statuses@~1.5.0:
   version "1.5.0"
   resolved "https://registry.yarnpkg.com/statuses/-/statuses-1.5.0.tgz#161c7dac177659fd9811f43771fa99381478628c"