diff --git a/package.json b/package.json
index ed4f587..9a388c4 100644
--- a/package.json
+++ b/package.json
@@ -12,6 +12,7 @@
     "dotenv": "^16.0.3",
     "express": "^4.17.1",
     "express-http-context2": "^1.0.0",
+    "express-rate-limit": "^7.0.1",
     "express-validator": "^6.13.0",
     "got": "^11.8.2",
     "hash-wasm": "^4.9.0",
diff --git a/src/routes/profile.js b/src/routes/profile.js
index 9211bc5..9e15a1a 100644
--- a/src/routes/profile.js
+++ b/src/routes/profile.js
@@ -29,18 +29,42 @@ more information on this, and how to apply and follow the GNU AGPL, see <https:/
 */
 import express from 'express'
 import bodyParserImport from 'body-parser'
+import { rateLimit } from 'express-rate-limit'
 import { generateSignatureProfile, utils, generateWKDProfile, generateHKPProfile, generateAutoProfile, generateKeybaseProfile } from '../server/index.js'
 import { Profile } from 'doipjs'
 import { getMetaFromReq } from '../server/utils.js'
+import logger from '../log.js'
 
 const router = express.Router()
 const bodyParser = bodyParserImport.urlencoded({ extended: false })
 
-router.get('/sig', (req, res) => {
+let profileRateLimiter = (req, res, next) => {
+  next()
+}
+
+if (process.env.ENABLE_EXPERIMENTAL_RATE_LIMITER) {
+  profileRateLimiter = rateLimit({
+    windowMs: 1000,
+    limit: 3,
+    standardHeaders: 'draft-7',
+    legacyHeaders: false,
+    handler: (req, res, next, options) => {
+      logger.debug('Rate-limiting a profile request',
+        { component: 'profile_rate_limiter', action: 'block' })
+
+      res.status(options.statusCode).render('429', { meta: getMetaFromReq(req) })
+    }
+  })
+
+  logger.debug('Starting the profile request rate limiter',
+    { component: 'profile_rate_limiter', action: 'start' })
+}
+
+router.get('/sig', profileRateLimiter, (req, res) => {
   res.render('profile', { isSignature: true, signature: null, meta: getMetaFromReq(req) })
 })
 
-router.post('/sig', bodyParser, async (req, res) => {
+router.post('/sig', profileRateLimiter, bodyParser, async (req, res) => {
   const data = await generateSignatureProfile(req.body.signature)
   const title = utils.generatePageTitle('profile', data)
   res.set('ariadne-identity-proof', data.identifier)
@@ -55,7 +79,7 @@ router.post('/sig', bodyParser, async (req, res) => {
   })
 })
 
-router.get('/wkd/:id', async (req, res) => {
+router.get('/wkd/:id', profileRateLimiter, async (req, res) => {
   const data = await generateWKDProfile(req.params.id)
   const title = utils.generatePageTitle('profile', data)
   res.set('ariadne-identity-proof', data.identifier)
@@ -68,7 +92,7 @@ router.get('/wkd/:id', async (req, res) => {
   })
 })
 
-router.get('/hkp/:id', async (req, res) => {
+router.get('/hkp/:id', profileRateLimiter, async (req, res) => {
   const data = await generateHKPProfile(req.params.id)
   const title = utils.generatePageTitle('profile', data)
   res.set('ariadne-identity-proof', data.identifier)
@@ -81,7 +105,7 @@ router.get('/hkp/:id', async (req, res) => {
   })
 })
 
-router.get('/hkp/:server/:id', async (req, res) => {
+router.get('/hkp/:server/:id', profileRateLimiter, async (req, res) => {
   const data = await generateHKPProfile(req.params.id, req.params.server)
   const title = utils.generatePageTitle('profile', data)
   res.set('ariadne-identity-proof', data.identifier)
@@ -94,7 +118,7 @@ router.get('/hkp/:server/:id', async (req, res) => {
   })
 })
 
-router.get('/keybase/:username/:fingerprint', async (req, res) => {
+router.get('/keybase/:username/:fingerprint', profileRateLimiter, async (req, res) => {
   const data = await generateKeybaseProfile(req.params.username, req.params.fingerprint)
   const title = utils.generatePageTitle('profile', data)
   res.set('ariadne-identity-proof', data.identifier)
@@ -107,7 +131,7 @@ router.get('/keybase/:username/:fingerprint', async (req, res) => {
   })
 })
 
-router.get('/:id', async (req, res) => {
+router.get('/:id', profileRateLimiter, async (req, res) => {
   const data = await generateAutoProfile(req.params.id)
   const title = utils.generatePageTitle('profile', data)
   res.set('ariadne-identity-proof', data.identifier)
diff --git a/template.env b/template.env
index 5f05cf4..d4a974f 100644
--- a/template.env
+++ b/template.env
@@ -36,4 +36,8 @@
 
 # Enable caching of keys (experimental)
 # Opt-in; to disable, omit the environment variable
-#ENABLE_EXPERIMENTAL_CACHE=
+#ENABLE_EXPERIMENTAL_CACHE=true
+
+# Enable profile request rate limiting (experimental)
+# Opt-in; to disable, omit the environment variable
+#ENABLE_EXPERIMENTAL_RATE_LIMITER=true
diff --git a/views/429.pug b/views/429.pug
new file mode 100644
index 0000000..48bb4cd
--- /dev/null
+++ b/views/429.pug
@@ -0,0 +1,8 @@
+extends templates/base.pug
+
+block content
+  h1 429 TOO MANY REQUESTS
+  p
+    | Too many requests from this IP, please try again later.
+    br
+    | Limit: 3 profile requests per second.
diff --git a/yarn.lock b/yarn.lock
index a4dfb29..806c582 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2269,6 +2269,11 @@ express-http-context2@^1.0.0:
   resolved "https://registry.yarnpkg.com/express-http-context2/-/express-http-context2-1.0.0.tgz#58cd9fb0d233739e0dcd7aabb766d1dc74522d77"
   integrity sha512-xdukoNNpWcuMn5ZJcjDe/tA+2A96rQ1MyAB/oWUU7qP15Tkz3txQyFsw/QG8YgRzTJ1sNAA8Bdq0o5b/1Y4zLA==
 
+express-rate-limit@^7.0.1:
+  version "7.0.1"
+  resolved "https://registry.yarnpkg.com/express-rate-limit/-/express-rate-limit-7.0.1.tgz#933af24166990ea4fc8004335e6cd6c86fd31562"
+  integrity sha512-oTIPm094gh8c7nbShl4TNLqnayzOcbDGY7dCRnFqUAvptyb0pp5231LaH34JtvVEbZlOJMiixikU5AVK8VN3FA==
+
 express-validator@^6.10.0, express-validator@^6.13.0:
   version "6.15.0"
   resolved "https://registry.yarnpkg.com/express-validator/-/express-validator-6.15.0.tgz#5e4601428960b0d66f5f4ae09cb32ed2077374a4"