diff --git a/packages/hardhat/hardhat.config.js b/packages/hardhat/hardhat.config.js
index 37ff3adb4..09c030817 100644
--- a/packages/hardhat/hardhat.config.js
+++ b/packages/hardhat/hardhat.config.js
@@ -185,6 +185,22 @@ module.exports = {
         mnemonic: mnemonic(),
       },
     },
+    testnetHarmony: {
+      url: "https://api.s0.b.hmny.io",
+      gasPrice: 1000000000,
+      chainId: 1666700000,
+      accounts: {
+        mnemonic: mnemonic(),
+      },
+    },
+    mainnetHarmony: {
+      url: "https://api.harmony.one",
+      gasPrice: 1000000000,
+      chainId: 1666600000,
+      accounts: {
+        mnemonic: mnemonic(),
+      },
+    },
   },
   solidity: {
     compilers: [
diff --git a/packages/react-app/src/constants.js b/packages/react-app/src/constants.js
index ac5280c67..4936ad86c 100644
--- a/packages/react-app/src/constants.js
+++ b/packages/react-app/src/constants.js
@@ -167,6 +167,22 @@ export const NETWORKS = {
     rpcUrl: `https://api.avax.network/ext/bc/C/rpc`,
     gasPrice: 225000000000,
   },
+  testnetHarmony: {
+    name: "Harmony Testnet",
+    color: "#00b0ef",
+    chainId: 1666700000,
+    blockExplorer: "https://explorer.pops.one/",
+    rpcUrl: `https://api.s0.b.hmny.io`,
+    gasPrice: 1000000000,
+  },
+  mainnetHarmony: {
+    name: "Harmony Mainnet",
+    color: "#00b0ef",
+    chainId: 1666600000,
+    blockExplorer: "https://explorer.harmony.one/",
+    rpcUrl: `https://api.harmony.one`,
+    gasPrice: 1000000000,
+  },
 };
 
 export const NETWORK = chainId => {