diff --git a/app/scripts/metamask-controller.js b/app/scripts/metamask-controller.js
index 933522c449f6..f5515009fbef 100644
--- a/app/scripts/metamask-controller.js
+++ b/app/scripts/metamask-controller.js
@@ -761,8 +761,6 @@ export default class MetamaskController extends EventEmitter {
         }),
     });
 
-    this.nftController.setApiKey(process.env.OPENSEA_KEY);
-
     const nftDetectionControllerMessenger =
       this.controllerMessenger.getRestricted({
         name: 'NftDetectionController',
diff --git a/builds.yml b/builds.yml
index e8c7f5a28d93..b3143a703081 100644
--- a/builds.yml
+++ b/builds.yml
@@ -214,13 +214,9 @@ env:
   # API keys to 3rd party services
   ###
 
-  - PUBNUB_PUB_KEY: null
-  - PUBNUB_SUB_KEY: null
   - SEGMENT_HOST: null
   - SENTRY_DSN: null
   - SENTRY_DSN_DEV: null
-  - OPENSEA_KEY: null
-  - ETHERSCAN_KEY: null
   # also INFURA_PROJECT_ID below
 
   ###
@@ -318,3 +314,10 @@ env:
   # This should NEVER be enabled in production since it slows down react
   ###
   - ENABLE_WHY_DID_YOU_RENDER: false
+
+  ###
+  # Unused environment variables referenced in dependencies
+  # Unset environment variables cause a build error. These are set to `null` to tell our build
+  # system that they are intentionally unset.
+  ###
+  - ETHERSCAN_KEY: null # Used by `gridplus-sdk/dist/util.js`