diff --git a/lib/travis/api/v3/permissions/build.rb b/lib/travis/api/v3/permissions/build.rb
new file mode 100644
index 00000000..e1f4bfb0
--- /dev/null
+++ b/lib/travis/api/v3/permissions/build.rb
@@ -0,0 +1,13 @@
+require 'travis/api/v3/permissions/generic'
+
+module Travis::API::V3
+  class Permissions::Build < Permissions::Generic
+    def cancel?
+      write?
+    end
+
+    def restart?
+      write?
+    end
+  end
+end
diff --git a/lib/travis/api/v3/permissions/job.rb b/lib/travis/api/v3/permissions/job.rb
new file mode 100644
index 00000000..3055257e
--- /dev/null
+++ b/lib/travis/api/v3/permissions/job.rb
@@ -0,0 +1,13 @@
+require 'travis/api/v3/permissions/generic'
+
+module Travis::API::V3
+  class Permissions::Job < Permissions::Generic
+    def cancel?
+      write?
+    end
+
+    def restart?
+      write?
+    end
+  end
+end
diff --git a/lib/travis/api/v3/queries/build.rb b/lib/travis/api/v3/queries/build.rb
index 1f97e7c7..8294a00a 100644
--- a/lib/travis/api/v3/queries/build.rb
+++ b/lib/travis/api/v3/queries/build.rb
@@ -6,5 +6,15 @@ module Travis::API::V3
       return Models::Build.find_by_id(id) if id
       raise WrongParams, 'missing build.id'.freeze
     end
+
+    def cancel
+      raise WrongParams, 'missing build.id'.freeze                         unless build.id
+      payload = {
+        build: { id: build.id }
+      }
+
+      perform_async(:build_cancellation, type: 'api'.freeze, credentials: { token: token }, payload: JSON.dump(payload))
+      payload
+    end
   end
 end
diff --git a/lib/travis/api/v3/routes.rb b/lib/travis/api/v3/routes.rb
index 811b153a..8d1d3584 100644
--- a/lib/travis/api/v3/routes.rb
+++ b/lib/travis/api/v3/routes.rb
@@ -18,7 +18,7 @@ module Travis::API::V3
       route '/build/{build.id}'
       get :find
 
-      # post :cancel, '/cancel'
+      post :cancel, '/cancel'
       # post :restart, '/restart'
     end
 
diff --git a/lib/travis/api/v3/services/build/cancel.rb b/lib/travis/api/v3/services/build/cancel.rb
new file mode 100644
index 00000000..bf1ab19b
--- /dev/null
+++ b/lib/travis/api/v3/services/build/cancel.rb
@@ -0,0 +1,13 @@
+module Travis::API::V3
+  class Services::Build::Cancel < Service
+
+    def run
+      raise LoginRequired unless access_control.logged_in? or access_control.full_access?
+      raise NotFound      unless build = find(:build)
+      access_control.permissions(build).cancel!
+
+      payload = query.cancel(build)
+      build
+    end
+  end
+end
diff --git a/spec/v3/services/build/find_spec.rb b/spec/v3/services/build/find_spec.rb
index a088aa03..17f364e6 100644
--- a/spec/v3/services/build/find_spec.rb
+++ b/spec/v3/services/build/find_spec.rb
@@ -26,9 +26,13 @@ describe Travis::API::V3::Services::Build::Find do
     before     { get("/v3/build/#{build.id}") }
     example    { expect(last_response).to be_ok }
     example    { expect(parsed_body).to be == {
-      "@type"              => "build",
-      "@href"              => "/v3/build/#{build.id}",
-      "@representation"    => "standard",
+      "@type"            => "build",
+      "@href"            => "/v3/build/#{build.id}",
+      "@representation"  => "standard",
+      "@permissions"     => {
+        "read"           => true,
+        "cancel"         => false,
+        "restart"        => false},
       "id"               => build.id,
       "number"           => build.number,
       "state"            => build.state,
@@ -99,9 +103,13 @@ describe Travis::API::V3::Services::Build::Find do
     after         { repo.update_attribute(:private, false) }
     example       { expect(last_response).to be_ok  }
     example    { expect(parsed_body).to be == {
-      "@type"              => "build",
-      "@href"              => "/v3/build/#{build.id}",
-      "@representation"    => "standard",
+      "@type"            => "build",
+      "@href"            => "/v3/build/#{build.id}",
+      "@representation"  => "standard",
+      "@permissions"     => {
+        "read"           => true,
+        "cancel"         => false,
+        "restart"        => false},
       "id"               => build.id,
       "number"           => build.number,
       "state"            => build.state,
diff --git a/spec/v3/services/builds/find_spec.rb b/spec/v3/services/builds/find_spec.rb
index 114bd355..bd2ff907 100644
--- a/spec/v3/services/builds/find_spec.rb
+++ b/spec/v3/services/builds/find_spec.rb
@@ -52,6 +52,10 @@ describe Travis::API::V3::Services::Builds::Find do
         "@type"            => "build",
         "@href"            => "/v3/build/#{build.id}",
         "@representation"  => "standard",
+        "@permissions"     => {
+          "read"           => true,
+          "cancel"         => false,
+          "restart"        => false },
         "id"               => build.id,
         "number"           => "3",
         "state"            => "configured",
@@ -149,6 +153,10 @@ describe Travis::API::V3::Services::Builds::Find do
         "@type"            => "build",
         "@href"            => "/v3/build/#{build.id}",
         "@representation"  => "standard",
+        "@permissions"     => {
+          "read"           => true,
+          "cancel"         => false,
+          "restart"        => false },
         "id"               => build.id,
         "number"           => "3",
         "state"            => "configured",
diff --git a/spec/v3/services/job/find_spec.rb b/spec/v3/services/job/find_spec.rb
index 476c44ad..56c1b5fe 100644
--- a/spec/v3/services/job/find_spec.rb
+++ b/spec/v3/services/job/find_spec.rb
@@ -20,6 +20,10 @@ describe Travis::API::V3::Services::Job::Find do
       "@type"             => "job",
       "@href"             => "/v3/job/#{job.id}",
       "@representation"   => "standard",
+      "@permissions"      => {
+        "read"            => true,
+        "cancel"          => false,
+        "restart"         => false },
       "id"                => job.id,
       "number"            => job.number,
       "state"             => job.state,
@@ -140,6 +144,10 @@ describe Travis::API::V3::Services::Job::Find do
       "@type"             => "job",
       "@href"             => "/v3/job/#{job.id}",
       "@representation"   => "standard",
+      "@permissions"      => {
+        "read"            => true,
+        "cancel"          => false,
+        "restart"         => false },
       "id"                => job.id,
       "number"            => job.number,
       "state"             => job.state,