diff --git a/src/claim.js b/src/claim.js
index f6d9bfa..b3db90b 100644
--- a/src/claim.js
+++ b/src/claim.js
@@ -225,7 +225,7 @@ class Claim {
 
     // For each match
     for (let index = 0; index < this._matches.length; index++) {
-      const claimData = this._matches[index]
+      let claimData = this._matches[index]
 
       let verificationResult = null
       let proofData = null
@@ -248,6 +248,11 @@ class Claim {
           fetcher: proofData.fetcher,
           viaProxy: proofData.viaProxy
         }
+
+        // Post process the data
+        if (claimData.functions && claimData.functions.postprocess) {
+          ({ claimData, proofData } = claimData.functions.postprocess(claimData, proofData))
+        }
       } else {
         // Consider the proof completed but with a negative result
         verificationResult = verificationResult || {
diff --git a/src/claimDefinitions/activitypub.js b/src/claimDefinitions/activitypub.js
new file mode 100644
index 0000000..afdf00f
--- /dev/null
+++ b/src/claimDefinitions/activitypub.js
@@ -0,0 +1,96 @@
+/*
+Copyright 2022 Yarmo Mackenbach
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+const E = require('../enums')
+
+const reURI = /^https:\/\/(.*)\/?/
+
+const processURI = (uri) => {
+  return {
+    serviceprovider: {
+      type: 'web',
+      name: 'activitypub'
+    },
+    match: {
+      regularExpression: reURI,
+      isAmbiguous: false
+    },
+    profile: {
+      display: uri,
+      uri: uri,
+      qr: null
+    },
+    proof: {
+      uri: uri,
+      request: {
+        fetcher: E.Fetcher.ACTIVITYPUB,
+        access: E.ProofAccess.GENERIC,
+        format: E.ProofFormat.JSON,
+        data: {
+          url: uri
+        }
+      }
+    },
+    claim: [
+      {
+        format: E.ClaimFormat.FINGERPRINT,
+        relation: E.ClaimRelation.CONTAINS,
+        path: ['summary']
+      },
+      {
+        format: E.ClaimFormat.FINGERPRINT,
+        relation: E.ClaimRelation.CONTAINS,
+        path: ['attachment', 'value']
+      }
+    ],
+    functions: {
+      postprocess: (claimData, proofData) => {
+        claimData.profile.display = `${proofData.result.preferredUsername}@${new URL(proofData.result.url).hostname}`
+        return { claimData, proofData }
+      }
+    }
+  }
+}
+
+const tests = [
+  {
+    uri: 'https://domain.org',
+    shouldMatch: true
+  },
+  {
+    uri: 'https://domain.org/@/alice/',
+    shouldMatch: true
+  },
+  {
+    uri: 'https://domain.org/@alice',
+    shouldMatch: true
+  },
+  {
+    uri: 'https://domain.org/u/alice/',
+    shouldMatch: true
+  },
+  {
+    uri: 'https://domain.org/users/alice/',
+    shouldMatch: true
+  },
+  {
+    uri: 'http://domain.org/alice',
+    shouldMatch: false
+  }
+]
+
+exports.reURI = reURI
+exports.processURI = processURI
+exports.tests = tests
diff --git a/src/claimDefinitions/index.js b/src/claimDefinitions/index.js
index dcc7b81..5046ca8 100644
--- a/src/claimDefinitions/index.js
+++ b/src/claimDefinitions/index.js
@@ -13,28 +13,6 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */
-const list = [
-  'dns',
-  'irc',
-  'xmpp',
-  'matrix',
-  'telegram',
-  'twitter',
-  'reddit',
-  'liberapay',
-  'lichess',
-  'hackernews',
-  'lobsters',
-  'devto',
-  'gitea',
-  'gitlab',
-  'github',
-  'mastodon',
-  'pleroma',
-  'discourse',
-  'owncast',
-  'stackexchange'
-]
 
 const data = {
   dns: require('./dns'),
@@ -52,6 +30,7 @@ const data = {
   gitea: require('./gitea'),
   gitlab: require('./gitlab'),
   github: require('./github'),
+  activitypub: require('./activitypub'),
   mastodon: require('./mastodon'),
   pleroma: require('./pleroma'),
   discourse: require('./discourse'),
@@ -59,5 +38,5 @@ const data = {
   stackexchange: require('./stackexchange')
 }
 
-exports.list = list
+exports.list = Object.keys(data)
 exports.data = data
diff --git a/src/defaults.js b/src/defaults.js
index 8c80cb1..2fd03ae 100644
--- a/src/defaults.js
+++ b/src/defaults.js
@@ -59,6 +59,10 @@ const opts = {
     },
     twitter: {
       bearerToken: null
+    },
+    activitypub: {
+      acct: null,
+      privateKey: null
     }
   }
 }
diff --git a/src/enums.js b/src/enums.js
index c2813fe..e15486a 100644
--- a/src/enums.js
+++ b/src/enums.js
@@ -39,20 +39,22 @@ Object.freeze(ProxyPolicy)
  * @enum {string}
  */
 const Fetcher = {
-  /** Basic HTTP requests */
-  HTTP: 'http',
+  /** HTTP requests to ActivityPub */
+  ACTIVITYPUB: 'activitypub',
   /** DNS module from Node.js */
   DNS: 'dns',
+  /** Basic HTTP requests */
+  HTTP: 'http',
   /** IRC module from Node.js */
   IRC: 'irc',
-  /** XMPP module from Node.js */
-  XMPP: 'xmpp',
   /** HTTP request to Matrix API */
   MATRIX: 'matrix',
   /** HTTP request to Telegram API */
   TELEGRAM: 'telegram',
   /** HTTP request to Twitter API */
-  TWITTER: 'twitter'
+  TWITTER: 'twitter',
+  /** XMPP module from Node.js */
+  XMPP: 'xmpp'
 }
 Object.freeze(Fetcher)
 
diff --git a/src/fetcher/activitypub.js b/src/fetcher/activitypub.js
new file mode 100644
index 0000000..655a0f0
--- /dev/null
+++ b/src/fetcher/activitypub.js
@@ -0,0 +1,102 @@
+/*
+Copyright 2022 Yarmo Mackenbach
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+const axios = require('axios')
+const validator = require('validator')
+const jsEnv = require('browser-or-node')
+
+/**
+ * @module fetcher/activitypub
+ */
+
+/**
+ * The request's timeout value in milliseconds
+ * @constant {number} timeout
+ */
+module.exports.timeout = 5000
+
+/**
+ * Execute a fetch request
+ * @function
+ * @async
+ * @param {object} data                           - Data used in the request
+ * @param {string} data.url                       - The URL of the account to verify
+ * @param {object} opts                           - Options used to enable the request
+ * @param {string} opts.claims.activitypub.url    - The URL of the verifier account
+ * @param {string} opts.claims.activitypub.privateKey   - The private key to sign the request
+ * @returns {object}
+ */
+module.exports.fn = async (data, opts) => {
+  let crypto
+  if (jsEnv.isNode) {
+    crypto = require('crypto')
+  }
+
+  let timeoutHandle
+  const timeoutPromise = new Promise((resolve, reject) => {
+    timeoutHandle = setTimeout(
+      () => reject(new Error('Request was timed out')),
+      data.fetcherTimeout ? data.fetcherTimeout : module.exports.timeout
+    )
+  })
+
+  const fetchPromise = new Promise((resolve, reject) => {
+    (async () => {
+      let isConfigured = false
+      try {
+        validator.isURL(opts.claims.activitypub.url)
+        isConfigured = true
+      } catch (_) {}
+
+      const now = new Date()
+      const { host, pathname, search } = new URL(data.url)
+
+      const headers = {
+        host,
+        date: now.toUTCString(),
+        accept: 'application/activity+json'
+      }
+
+      if (isConfigured && jsEnv.isNode) {
+        // Generate the signature
+        const signedString = `(request-target): get ${pathname}${search}\nhost: ${host}\ndate: ${now.toUTCString()}`
+        const sign = crypto.createSign('SHA256')
+        sign.write(signedString)
+        sign.end()
+        const signatureSig = sign.sign(opts.claims.activitypub.privateKey.replace(/\\n/g, '\n'), 'base64')
+        headers.signature = `keyId="${opts.claims.activitypub.url}#main-key",headers="(request-target) host date",signature="${signatureSig}",algorithm="rsa-sha256"`
+      }
+
+      axios.get(data.url,
+        {
+          headers
+        })
+        .then(res => {
+          return res.data
+        })
+        .then(res => {
+          resolve(res)
+        })
+        .catch(error => {
+          reject(error)
+        })
+    })()
+  })
+
+  return Promise.race([fetchPromise, timeoutPromise]).then((result) => {
+    clearTimeout(timeoutHandle)
+    return result
+  })
+}
diff --git a/src/fetcher/index.js b/src/fetcher/index.js
index df32047..ffc19e8 100644
--- a/src/fetcher/index.js
+++ b/src/fetcher/index.js
@@ -14,6 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+exports.activitypub = require('./activitypub')
 exports.dns = require('./dns')
 exports.http = require('./http')
 exports.irc = require('./irc')
diff --git a/src/proxy/api/v2/index.js b/src/proxy/api/v2/index.js
index 18f7a17..715d27c 100644
--- a/src/proxy/api/v2/index.js
+++ b/src/proxy/api/v2/index.js
@@ -246,4 +246,25 @@ router.get(
   }
 )
 
+// ActivityPub route
+router.get(
+  '/get/activitypub',
+  query('url').isURL(),
+  async (req, res) => {
+    const errors = validationResult(req)
+    if (!errors.isEmpty()) {
+      return res.status(400).json({ errors: errors.array() })
+    }
+
+    fetcher.activitypub
+      .fn(req.query, opts)
+      .then((data) => {
+        return res.status(200).send(data)
+      })
+      .catch((err) => {
+        return res.status(400).json({ errors: err.message ? err.message : err })
+      })
+  }
+)
+
 module.exports = router
diff --git a/src/verifications.js b/src/verifications.js
index c5ce662..41f9637 100644
--- a/src/verifications.js
+++ b/src/verifications.js
@@ -200,33 +200,50 @@ const run = async (proofData, claimData, fingerprint) => {
     errors: []
   }
 
+  const claimMethods = Array.isArray(claimData.claim)
+    ? claimData.claim
+    : [claimData.claim]
+
   switch (claimData.proof.request.format) {
     case E.ProofFormat.JSON:
-      try {
-        res.result = await runJSON(
-          proofData,
-          claimData.claim.path,
-          fingerprint,
-          claimData.claim.format,
-          claimData.claim.relation
-        )
-        res.completed = true
-      } catch (error) {
-        res.errors.push(error.message ? error.message : error)
+      for (let index = 0; index < claimMethods.length; index++) {
+        const claimMethod = claimMethods[index]
+        try {
+          res.result = res.result || await runJSON(
+            proofData,
+            claimMethod.path,
+            fingerprint,
+            claimMethod.format,
+            claimMethod.relation
+          )
+        } catch (error) {
+          res.errors.push(error.message ? error.message : error)
+        }
       }
+      res.completed = true
       break
     case E.ProofFormat.TEXT:
-      try {
-        res.result = await containsProof(proofData,
-          fingerprint,
-          claimData.claim.format)
-        res.completed = true
-      } catch (error) {
-        res.errors.push('err_unknown_text_verification')
+      for (let index = 0; index < claimMethods.length; index++) {
+        const claimMethod = claimMethods[index]
+        try {
+          res.result = res.result || await containsProof(
+            proofData,
+            fingerprint,
+            claimMethod.format
+          )
+        } catch (error) {
+          res.errors.push('err_unknown_text_verification')
+        }
       }
+      res.completed = true
       break
   }
 
+  // Reset the errors if one of the claim methods was successful
+  if (res.result) {
+    res.errors = []
+  }
+
   return res
 }
 
diff --git a/test/claimDefinitions.test.js b/test/claimDefinitions.test.js
index 3f494ae..66b78b8 100644
--- a/test/claimDefinitions.test.js
+++ b/test/claimDefinitions.test.js
@@ -49,10 +49,11 @@ const pattern = {
       data: _.isObject,
     },
   },
-  claim: {
-    format: _.isInteger,
-    relation: _.isInteger,
-    path: _.isArray,
+  claim: (x) => {
+    return _.isObject(x) || _.isArray(x)
+  },
+  functions: (x) => {
+    return _.isObject(x) || _.isUndefined(x)
   },
 }