diff --git a/compatibility b/compatibility
index 2ffb646..02d198d 100644
--- a/compatibility
+++ b/compatibility
@@ -55,6 +55,10 @@ rails:
   - version: '~> 7.0.0'
     # 3.3 has a bug: https://bugs.ruby-lang.org/issues/20085
     ruby: ['>= 2.7', '< 3.3']
+    gem:
+      sinatra: '>= 0.a'
+      grape: '>= 0.a'
+      pry: '> 0'
   - version: '~> 7.1.0'
     # 3.3 has a bug: https://bugs.ruby-lang.org/issues/20085
     ruby: ['>= 2.7', '< 3.3']
diff --git a/rails.rb b/rails.rb
index 0176424..dce280f 100644
--- a/rails.rb
+++ b/rails.rb
@@ -28,17 +28,146 @@ gemfile(true) do
 
   gem 'rails', "~> #{version}.0"
   gem server
+  gem 'ddtrace', path: '../../Datadog/dd-trace-rb', require: 'ddtrace/auto_instrument'
 
   match.fetch('gem', []).each do |name, requirement|
     gem name, requirement
   end
 end
 
+require 'grape'
+
+class GrapeAPI < Grape::API
+  version 'v0', using: :header, vendor: 'hello'
+  format :json
+  prefix :hello
+
+  get :world do
+    { hello: 'grape' }
+  end
+
+  get '/:id' do
+    { hello: params[:id] }
+  end
+
+  class Deeper < Grape::API
+    get :world do
+      { hello: 'deeper' }
+    end
+
+    get '/:id' do
+      { hello: params[:id] }
+    end
+  end
+
+  class Deep < Grape::API
+    get :world do
+      { hello: 'deep' }
+    end
+
+    get '/:id' do
+      { hello: params[:id] }
+    end
+
+    mount Deeper => '/deeper'
+  end
+
+  mount Deep => '/deep'
+end
+
+require 'sinatra/base'
+require 'json'
+
+class SinatraApp < Sinatra::Base
+  get '/hello/world' do
+    status 200
+    content_type :json
+    body JSON.dump({ hello: :sinatra })
+  end
+
+  get '/hello/:id' do
+    status 200
+    content_type :json
+    body JSON.dump({ hello: params[:id] })
+  end
+end
+
+RackApp = Rack::Builder.new do
+  map "/hello/world" do
+    run -> (env) { [200, { 'content-type' => 'application/json' }, [JSON.dump({ hello: :rack })]] }
+  end
+
+  map "/grape" do
+    run GrapeAPI.new
+  end
+
+  map "/sinatra" do
+    run SinatraApp.new
+  end
+
+  map "/rack" do
+    run -> (env) { RackApp.call(env) }
+  end
+
+  map "/engine/simple" do
+    run -> (env) { SimpleEngine::Engine.call(env) }
+  end
+
+  map "/engine/endpoint" do
+    run -> (env) { EndpointEngine::Engine.call(env) }
+  end
+end
+
 require "action_controller/railtie"
 
+module FindRootHack
+    def find_root(from)
+      Pathname.new File.realpath from
+    end
+end
+
+module SimpleEngine
+  class Engine < ::Rails::Engine
+    extend FindRootHack
+
+    routes.append do
+      get "/hello/world" => "simple_engine/hello#world"
+      get "/hello/:id" => "simple_engine/hello#world"
+    end
+  end
+
+  class HelloController < ActionController::API
+    def world
+      render json: {hello: :engine}
+    end
+  end
+end
+
+module EndpointEngine
+  class Engine < ::Rails::Engine
+    extend FindRootHack
+
+    endpoint RackApp
+  end
+
+  class HelloController < ActionController::API
+    def world
+      render json: {hello: params[:id] || :engine}
+    end
+  end
+end
+
+module SimpleApp
 class App < Rails::Application
   routes.append do
     get "/hello/world" => "hello#world"
+    get "/hello/:id" => "hello#world"
+
+    mount SimpleEngine::Engine => "/engine/simple"
+    mount EndpointEngine::Engine => "/engine/endpoint"
+    mount RackApp => "/rack"
+    mount SinatraApp => "/sinatra"
+    mount GrapeAPI => "/grape"
   end
 
   config.consider_all_requests_local = true # display errors
@@ -50,6 +179,7 @@ class App < Rails::Application
     config.secret_key_base = 'a4e6df27-2f39-41e4-83d2-3bc4d087c910'
   end
 end
+end
 
 if Gem::Requirement.new('< 5.0').satisfied_by?(Gem.loaded_specs['rails'].version)
   action_controller_api_class = ActionController::Base
@@ -59,10 +189,19 @@ end
 
 class HelloController < action_controller_api_class
   def world
-    render json: {hello: :world}
+    render json: {hello: params[:id] || :rails}
   end
 end
 
-App.initialize!
+Datadog.configuration do |c|
+  c.diagnostics.debug = ['true', '1'].include?(ENV['DD_DIAGNOSTICS'])
+  c.tracing.enabled = true
+  c.tracing.instrument :rack
+  c.tracing.instrument :rails
+  c.tracing.instrument :sinatra
+  c.tracing.instrument :grape
+end
 
-Rack::Server.new(app: App, Host: '0.0.0.0', Port: 3000).start
+SimpleApp::App.initialize!
+
+Rack::Server.new(app: SimpleApp::App, Host: '0.0.0.0', Port: 3000).start