diff --git a/index.js b/index.js
index 7729e25..bb9a1b2 100644
--- a/index.js
+++ b/index.js
@@ -66,6 +66,7 @@ exports.init = function (sbot, config) {
 
   var getMsg = memo({cache: lru(100)}, getMsgWithValue, sbot)
   var getAbout = memo({cache: lru(100)}, require('./lib/about'), sbot)
+  var serveAcmeChallenge = require('ssb-acme-validator')(sbot)
 
   http.createServer(serve).listen(port, host, function () {
     console.log('[viewer] Listening on http://' + host + ':' + port)
@@ -80,6 +81,7 @@ exports.init = function (sbot, config) {
 
     if (req.url.startsWith('/user-feed/')) return serveUserFeed(req, res, m[4])
     else if (req.url.startsWith('/channel/')) return serveChannel(req, res, m[4])
+    else if (req.url.startsWith('/.well-known/acme-challenge')) return serveAcmeChallenge(req, res)
 
     if (m[2] && m[2].length === 3) {
       m[1] = decodeURIComponent(m[1])
diff --git a/package.json b/package.json
index 26d977a..9ebe39b 100644
--- a/package.json
+++ b/package.json
@@ -14,6 +14,7 @@
     "pull-cat": "^1.1.11",
     "pull-paramap": "^1.2.1",
     "pull-stream": "^3.5.0",
+    "ssb-acme-validator": "http://localhost:8989/blobs/get/&gB8wJuZROfFYWv+vxXaX4dBRG/U0W7eBNtFkkyN7A60=.sha256",
     "ssb-client": "^4.4.0",
     "ssb-marked": "^0.7.2",
     "ssb-ref": "^2.6.2",