diff --git a/apps/block_scout_web/lib/block_scout_web/endpoint.ex b/apps/block_scout_web/lib/block_scout_web/endpoint.ex
index caed03e3ff..9066000a49 100644
--- a/apps/block_scout_web/lib/block_scout_web/endpoint.ex
+++ b/apps/block_scout_web/lib/block_scout_web/endpoint.ex
@@ -72,6 +72,9 @@ defmodule BlockScoutWeb.Endpoint do
 
   plug(BlockScoutWeb.Prometheus.Exporter)
 
+  # 'x-apollo-tracing' header for https://www.graphqlbin.com to work with our GraphQL endpoint
+  plug(CORSPlug, headers: ["x-apollo-tracing" | CORSPlug.defaults()[:headers]])
+
   plug(BlockScoutWeb.Router)
 
   def init(_key, config) do
diff --git a/apps/block_scout_web/mix.exs b/apps/block_scout_web/mix.exs
index 22a7624add..5516c589f1 100644
--- a/apps/block_scout_web/mix.exs
+++ b/apps/block_scout_web/mix.exs
@@ -68,6 +68,8 @@ defmodule BlockScoutWeb.Mixfile do
       # Absinthe support for the Relay framework
       {:absinthe_relay, "~> 1.4"},
       {:bypass, "~> 0.8", only: :test},
+      # To add (CORS)(https://www.w3.org/TR/cors/)
+      {:cors_plug, "~> 2.0"},
       {:credo, "0.10.2", only: [:dev, :test], runtime: false},
       # For Absinthe to load data in batches
       {:dataloader, "~> 1.0.0"},
diff --git a/mix.lock b/mix.lock
index 6d76e8744e..40ab29439d 100644
--- a/mix.lock
+++ b/mix.lock
@@ -17,6 +17,7 @@
   "combine": {:hex, :combine, "0.10.0", "eff8224eeb56498a2af13011d142c5e7997a80c8f5b97c499f84c841032e429f", [:mix], []},
   "comeonin": {:hex, :comeonin, "4.1.1", "c7304fc29b45b897b34142a91122bc72757bc0c295e9e824999d5179ffc08416", [:mix], [{:argon2_elixir, "~> 1.2", [hex: :argon2_elixir, optional: true]}, {:bcrypt_elixir, "~> 0.12.1 or ~> 1.0", [hex: :bcrypt_elixir, optional: true]}, {:pbkdf2_elixir, "~> 0.12", [hex: :pbkdf2_elixir, optional: true]}]},
   "connection": {:hex, :connection, "1.0.4", "a1cae72211f0eef17705aaededacac3eb30e6625b04a6117c1b2db6ace7d5976", [:mix], []},
+  "cors_plug": {:hex, :cors_plug, "2.0.0", "238ddb479f92b38f6dc1ae44b8d81f0387f9519101a6da442d543ab70ee0e482", [:mix], [{:plug, "~> 1.3 or ~> 1.4 or ~> 1.5", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm"},
   "cowboy": {:hex, :cowboy, "1.1.2", "61ac29ea970389a88eca5a65601460162d370a70018afe6f949a29dca91f3bb0", [:rebar3], [{:cowlib, "~> 1.0.2", [hex: :cowlib, repo: "hexpm", optional: false]}, {:ranch, "~> 1.3.2", [hex: :ranch, repo: "hexpm", optional: false]}], "hexpm"},
   "cowlib": {:hex, :cowlib, "1.0.2", "9d769a1d062c9c3ac753096f868ca121e2730b9a377de23dec0f7e08b1df84ee", [:make], []},
   "credo": {:hex, :credo, "0.10.2", "03ad3a1eff79a16664ed42fc2975b5e5d0ce243d69318060c626c34720a49512", [:mix], [{:bunt, "~> 0.2.0", [hex: :bunt, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm"},