diff --git a/.github/workflows/ci-depot.yaml b/.github/workflows/ci-depot.yaml
index 4ebe7e2..54e1336 100644
--- a/.github/workflows/ci-depot.yaml
+++ b/.github/workflows/ci-depot.yaml
@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: ["7.4", "8.0", "8.1", "8.2", "8.3", "8.4"]
+        php: ["8.1", "8.2", "8.3", "8.4"]
 
     steps:
       - name: Checkout repository
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 8127d14..c9bba69 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: ["7.4", "8.0", "8.1", "8.2", "8.3", "8.4"]
+        php: ["8.1", "8.2", "8.3", "8.4"]
 
     steps:
       - name: Checkout repository
diff --git a/composer.json b/composer.json
index 0beb628..8de3382 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
         }
     ],
     "require": {
-        "php": "^7.3 || ^8.0",
+        "php": "^8.1",
         "php-http/discovery": "^1.19",
         "psr/http-client": "^1.0",
         "psr/http-factory": "^1.0",
diff --git a/lib/src/Router.php b/lib/src/Router.php
index 91952d7..3c797c7 100644
--- a/lib/src/Router.php
+++ b/lib/src/Router.php
@@ -52,6 +52,11 @@ public function registerHandler(string $path, RequestHandlerInterface $handler):
         $this->handlers[$path] = $handler;
     }
 
+    public function registerServer(ServerWithPathPrefix&RequestHandlerInterface $server): void
+    {
+        $this->handlers[$server->getPathPrefix()] = $server;
+    }
+
     public function handle(ServerRequestInterface $request): ResponseInterface
     {
         foreach ($this->handlers as $path => $handler) {
diff --git a/lib/src/ServerWithPathPrefix.php b/lib/src/ServerWithPathPrefix.php
new file mode 100644
index 0000000..21a4178
--- /dev/null
+++ b/lib/src/ServerWithPathPrefix.php
@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Twirp;
+
+interface ServerWithPathPrefix
+{
+    /**
+     * Returns the base service path, in the form: "/<prefix>/<package>.<Service>/"
+     * that is everything in a Twirp route except for the <Method>. This can be used for routing,
+     * for example, to identify the requests that are targeted to this service in a mux.
+     */
+    public function getPathPrefix(): string;
+}
diff --git a/protoc-gen-twirp_php/templates/service/Server.php.tmpl b/protoc-gen-twirp_php/templates/service/Server.php.tmpl
index 62a61c4..b64cab2 100644
--- a/protoc-gen-twirp_php/templates/service/Server.php.tmpl
+++ b/protoc-gen-twirp_php/templates/service/Server.php.tmpl
@@ -17,13 +17,16 @@ use Twirp\BaseServerHooks;
 use Twirp\Context;
 use Twirp\ErrorCode;
 use Twirp\ServerHooks;
+use Twirp\ServerWithPathPrefix;
 
 /**
  * @see {{ .Service | phpServiceName .File }}
  *
  * Generated from protobuf service <code>{{ .Service.Desc.FullName }}</code>
  */
-final class {{ .Service | phpServiceName .File }}Server implements RequestHandlerInterface
+final class {{ .Service | phpServiceName .File }}Server implements
+    RequestHandlerInterface,
+    ServerWithPathPrefix
 {
     /**
      * A convenience constant that may identify URL paths.