diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 11b79315e..1687e7975 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,10 +1,17 @@
 name: Build and deploy
 on: [push, pull_request]
 jobs:
+  variables:
+    ETHERSCAN_API_KEY: ${{ secrets.ETHERSCAN_API_KEY_DEV }}
+  rules:
+    - if: ${{ github.ref == 'refs/heads/master' }}
+      variables:
+        ETHERSCAN_API_KEY: ${{ secrets.ETHERSCAN_API_KEY_PROD }}
   main:
     runs-on: ubuntu-latest
     env:
       APP_NAME: wallet
+      ETHERSCAN_API_KEY: $ETHERSCAN_API_KEY
       WALLET_CONNECT_PROJECT_ID: ${{ secrets.WALLET_CONNECT_PROJECT_ID }}
       TOKEN_SALES_URL_MAINNET: ${{ secrets.TOKEN_SALES_URL_MAINNET }}
       TOKEN_SALES_URL_TESTNET: ${{ secrets.TOKEN_SALES_URL_TESTNET }}
diff --git a/src/protocols/ethereum/libs/EtherscanService.ts b/src/protocols/ethereum/libs/EtherscanService.ts
index be34b7ad3..0a2052622 100644
--- a/src/protocols/ethereum/libs/EtherscanService.ts
+++ b/src/protocols/ethereum/libs/EtherscanService.ts
@@ -28,7 +28,7 @@ export class EtherscanService {
   apiUrl: string;
 
   // TODO - update delay if we use paid API key
-  freeVersionTimeDelay = ETHERSCAN_API_KEY ? 250 : 5300;
+  freeVersionTimeDelay = 5000 + Math.floor(Math.random() * 1000);
 
   constructor(apiUrl: string) {
     this.apiUrl = apiUrl;
@@ -40,7 +40,6 @@ export class EtherscanService {
       apikey: ETHERSCAN_API_KEY,
     }).toString();
 
-    // Without API key amount of calls are limited to one per every 5 seconds.
     // With free API key we can make 5 calls per second.
     // We're adding delays between calls to avoid getting empty results.
     // TODO: Use own node or paid version