diff --git a/.env.example b/.env.example
index 55e2c41..0b7ae91 100644
--- a/.env.example
+++ b/.env.example
@@ -1,9 +1,9 @@
 PRIVATE_KEY=
-ETH_RPC=https://
+ALCHEMY_KEY=
+INFURA_KEY=
 XDAI_RPC=https://
 BSC_RPC=https://
 MINIMUM_WITHDRAWAL_AMOUNT=0.05
 MAXIMUM_DEPOSIT_AMOUNT=1
-ALCHEMY_KEY=
-INFURA_API_KEY=
 ETHERSCAN_KEY=
+BSCSCAN_KEY=
diff --git a/hardhat.config.js b/hardhat.config.js
index b42ec45..1e7e1f2 100644
--- a/hardhat.config.js
+++ b/hardhat.config.js
@@ -64,7 +64,7 @@ const config = {
       blockGasLimit: 50000000,
     },
     rinkeby: {
-      url: `https://rinkeby.infura.io/v3/${process.env.INFURA_API_KEY}`,
+      url: `https://rinkeby.infura.io/v3/${process.env.INFURA_KEY}`,
       accounts: process.env.PRIVATE_KEY
         ? [process.env.PRIVATE_KEY]
         : {
@@ -72,7 +72,7 @@ const config = {
           },
     },
     xdai: {
-      url: process.env.ETH_RPC || 'https://rpc.xdaichain.com/',
+      url: process.env.XDAI_RPC || 'https://rpc.xdaichain.com/',
       accounts: process.env.PRIVATE_KEY
         ? [process.env.PRIVATE_KEY]
         : {
@@ -81,7 +81,7 @@ const config = {
       gasPrice: 25000000000,
     },
     bsc: {
-      url: process.env.ETH_RPC || 'https://bsc-dataseed.binance.org/',
+      url: process.env.BSC_RPC || 'https://bsc-dataseed.binance.org/',
       accounts: process.env.PRIVATE_KEY
         ? [process.env.PRIVATE_KEY]
         : {
@@ -98,7 +98,10 @@ const config = {
     },
   },
   etherscan: {
-    apiKey: process.env.ETHERSCAN_KEY,
+    apiKey: {
+      mainnet: process.env.ETHERSCAN_KEY,
+      bsc: process.env.BSCSCAN_KEY,
+    },
   },
   mocha: {
     timeout: 600000000,
diff --git a/package.json b/package.json
index e12ef6b..9b53de5 100644
--- a/package.json
+++ b/package.json
@@ -52,7 +52,7 @@
     "typechain": "^5.1.2"
   },
   "devDependencies": {
-    "@nomiclabs/hardhat-etherscan": "^2.1.8",
+    "@nomiclabs/hardhat-etherscan": "3.1.0",
     "babel-eslint": "^10.1.0",
     "eslint": "^7.28.0",
     "eslint-config-prettier": "^8.3.0",
diff --git a/yarn.lock b/yarn.lock
index 6b71cf7..d3b5512 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -923,18 +923,21 @@
   resolved "https://registry.yarnpkg.com/@nomiclabs/hardhat-ethers/-/hardhat-ethers-2.0.2.tgz#c472abcba0c5185aaa4ad4070146e95213c68511"
   integrity sha512-6quxWe8wwS4X5v3Au8q1jOvXYEPkS1Fh+cME5u6AwNdnI4uERvPlVjlgRWzpnb+Rrt1l/cEqiNRH9GlsBMSDQg==
 
-"@nomiclabs/hardhat-etherscan@^2.1.8":
-  version "2.1.8"
-  resolved "https://registry.yarnpkg.com/@nomiclabs/hardhat-etherscan/-/hardhat-etherscan-2.1.8.tgz#e206275e96962cd15e5ba9148b44388bc922d8c2"
-  integrity sha512-0+rj0SsZotVOcTLyDOxnOc3Gulo8upo0rsw/h+gBPcmtj91YqYJNhdARHoBxOhhE8z+5IUQPx+Dii04lXT14PA==
+"@nomiclabs/hardhat-etherscan@3.1.0":
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/@nomiclabs/hardhat-etherscan/-/hardhat-etherscan-3.1.0.tgz#7137554862b3b1c914f1b1bf110f0529fd2dec53"
+  integrity sha512-JroYgfN1AlYFkQTQ3nRwFi4o8NtZF7K/qFR2dxDUgHbCtIagkUseca9L4E/D2ScUm4XT40+8PbCdqZi+XmHyQA==
   dependencies:
     "@ethersproject/abi" "^5.1.2"
     "@ethersproject/address" "^5.0.2"
     cbor "^5.0.2"
+    chalk "^2.4.2"
     debug "^4.1.1"
     fs-extra "^7.0.1"
-    node-fetch "^2.6.0"
+    lodash "^4.17.11"
     semver "^6.3.0"
+    table "^6.8.0"
+    undici "^5.4.0"
 
 "@nomiclabs/hardhat-waffle@^2.0.1":
   version "2.0.1"
@@ -9330,6 +9333,17 @@ table@^6.0.9:
     string-width "^4.2.3"
     strip-ansi "^6.0.1"
 
+table@^6.8.0:
+  version "6.8.0"
+  resolved "https://registry.yarnpkg.com/table/-/table-6.8.0.tgz#87e28f14fa4321c3377ba286f07b79b281a3b3ca"
+  integrity sha512-s/fitrbVeEyHKFa7mFdkuQMWlH1Wgw/yEXMt5xACT4ZpzWFluehAxRtUUQKPuWhaLAWhFcVx6w3oC8VKaUfPGA==
+  dependencies:
+    ajv "^8.0.1"
+    lodash.truncate "^4.4.2"
+    slice-ansi "^4.0.0"
+    string-width "^4.2.3"
+    strip-ansi "^6.0.1"
+
 tape@^4.6.3:
   version "4.14.0"
   resolved "https://registry.yarnpkg.com/tape/-/tape-4.14.0.tgz#e4d46097e129817175b90925f2385f6b1bcfa826"
@@ -9712,6 +9726,11 @@ underscore@1.9.1:
   resolved "https://registry.yarnpkg.com/underscore/-/underscore-1.9.1.tgz#06dce34a0e68a7babc29b365b8e74b8925203961"
   integrity sha512-5/4etnCkd9c8gwgowi5/om/mYO5ajCaOgdzj/oW+0eQV9WxKBDZw5+ycmKmeaTXjInS/W0BzpGLo2xR2aBwZdg==
 
+undici@^5.4.0:
+  version "5.8.0"
+  resolved "https://registry.yarnpkg.com/undici/-/undici-5.8.0.tgz#dec9a8ccd90e5a1d81d43c0eab6503146d649a4f"
+  integrity sha512-1F7Vtcez5w/LwH2G2tGnFIihuWUlc58YidwLiCv+jR2Z50x0tNXpRRw7eOIJ+GvqCqIkg9SB7NWAJ/T9TLfv8Q==
+
 union-value@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/union-value/-/union-value-1.0.1.tgz#0b6fe7b835aecda61c6ea4d4f02c14221e109847"