diff --git a/services/wikiapiary/wikiapiary-installs.service.js b/services/wikiapiary/wikiapiary-installs.service.js
new file mode 100644
index 0000000000000..3aa11e110da2a
--- /dev/null
+++ b/services/wikiapiary/wikiapiary-installs.service.js
@@ -0,0 +1,110 @@
+'use strict'
+
+const Joi = require('joi')
+const { metric } = require('../text-formatters')
+const { BaseJsonService, NotFound } = require('..')
+
+const documentation = `
+  <p>
+    The name of an extension is case-sensitive excluding the first character.
+  </p>
+  <p>
+    For example, in the case of <code>ParserFunctions</code>, the following are
+    valid:
+    <ul>
+      <li><code>ParserFunctions</code></li>
+      <li><code>parserFunctions</code></li>
+    </ul>
+
+    However, the following are invalid:
+    <ul>
+      <li><code>parserfunctions</code></li>
+      <li><code>Parserfunctions</code></li>
+      <li><code>pARSERfUNCTIONS</code></li>
+    </ul>
+  </p>
+`
+
+const schema = Joi.object({
+  query: Joi.object({
+    results: Joi.alternatives([
+      Joi.object()
+        .required()
+        .pattern(/^\w+:.+$/, {
+          printouts: Joi.object({
+            'Has website count': Joi.array()
+              .required()
+              .items(Joi.number().required()),
+          }).required(),
+        }),
+      Joi.array().required(),
+    ]).required(),
+  }).required(),
+}).required()
+
+/**
+ * This badge displays the total installations of a MediaWiki extensions, skins,
+ * etc via Wikiapiary.
+ *
+ * {@link https://www.mediawiki.org/wiki/Manual:Extensions MediaWiki Extensions Manual}
+ */
+module.exports = class WikiapiaryInstalls extends BaseJsonService {
+  static category = 'downloads'
+  static route = {
+    base: 'wikiapiary',
+    pattern: ':variant(extension|skin|farm|generator|host)/installs/:name',
+  }
+
+  static examples = [
+    {
+      title: 'Wikiapiary installs',
+      namedParams: { variant: 'extension', name: 'ParserFunctions' },
+      staticPreview: this.render({ usage: 11170 }),
+      documentation,
+      keywords: ['mediawiki'],
+    },
+  ]
+
+  static defaultBadgeData = { label: 'installs', color: 'informational' }
+
+  static render({ usage }) {
+    return { message: metric(usage) }
+  }
+
+  static validate({ results }) {
+    if (Array.isArray(results))
+      throw new NotFound({ prettyMessage: 'not found' })
+  }
+
+  async fetch({ variant, name }) {
+    return this._requestJson({
+      schema,
+      url: `https://wikiapiary.com/w/api.php`,
+      options: {
+        qs: {
+          action: 'ask',
+          query: `[[${variant}:${name}]]|?Has_website_count`,
+          format: 'json',
+        },
+      },
+    })
+  }
+
+  async handle({ variant, name }) {
+    const response = await this.fetch({ variant, name })
+    const { results } = response.query
+
+    this.constructor.validate({ results })
+
+    const keyLowerCase = `${variant}:${name.toLowerCase()}`
+    const resultKey = Object.keys(results).find(
+      key => keyLowerCase === key.toLowerCase()
+    )
+
+    if (resultKey === undefined)
+      throw new NotFound({ prettyMessage: 'not found' })
+
+    const [usage] = results[resultKey].printouts['Has website count']
+    return this.constructor.render({ usage })
+  }
+}
diff --git a/services/wikiapiary/wikiapiary-installs.tester.js b/services/wikiapiary/wikiapiary-installs.tester.js
new file mode 100644
index 0000000000000..fee38c87645f1
--- /dev/null
+++ b/services/wikiapiary/wikiapiary-installs.tester.js
@@ -0,0 +1,44 @@
+'use strict'
+
+const t = (module.exports = require('../tester').createServiceTester())
+const { isMetric } = require('../test-validators')
+
+t.create('Extension')
+  .get('/extension/installs/ParserFunctions.json')
+  .expectBadge({ label: 'installs', message: isMetric })
+
+t.create('Skins')
+  .get('/skin/installs/Vector.json')
+  .expectBadge({ label: 'installs', message: isMetric })
+
+t.create('Extension Not Found')
+  .get('/extension/installs/FakeExtensionThatDoesNotExist.json')
+  .expectBadge({ label: 'installs', message: 'not found' })
+
+t.create('Name Lowercase')
+  .get('/extension/installs/parserfunctions.json')
+  .expectBadge({ label: 'installs', message: 'not found' })
+
+t.create('Name Title Case')
+  .get('/extension/installs/parserFunctions.json')
+  .expectBadge({ label: 'installs', message: isMetric })
+
+t.create('Malformed API Response')
+  .get('/extension/installs/ParserFunctions.json')
+  .intercept(nock =>
+    nock('https://wikiapiary.com')
+      .get('/w/api.php')
+      .query({
+        action: 'ask',
+        query: '[[extension:ParserFunctions]]|?Has_website_count',
+        format: 'json',
+      })
+      .reply(200, {
+        query: {
+          results: {
+            'Extension:Malformed': { printouts: { 'Has website count': [0] } },
+          },
+        },
+      })
+  )
+  .expectBadge({ label: 'installs', message: 'not found' })