diff --git a/package.json b/package.json
index 73f96df..682574b 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
   "author": "PSE",
   "scripts": {
     "build": "pnpm --recursive --sort run build",
-    "dev:server": "pnpm --filter backend run dev",
+    "dev:server": "pnpm --filter backend run dev:optimism-sepolia",
     "start:interface": "pnpm --filter interface run start",
     "dev:interface": "pnpm --filter interface run dev"
   },
diff --git a/packages/backend/package.json b/packages/backend/package.json
index 17a6abe..f61e867 100644
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@@ -5,7 +5,8 @@
   "main": "index.js",
   "scripts": {
     "build": "tsc",
-    "dev": "ts-node-dev src/index.ts"
+    "dev:optimism": "ts-node-dev src/index.ts --network optimism",
+    "dev:optimism-sepolia": "ts-node-dev src/index.ts --network optimism-sepolia"
   },
   "keywords": [],
   "author": "",
diff --git a/packages/backend/src/account.ts b/packages/backend/src/account.ts
index 352474f..5dcdf43 100644
--- a/packages/backend/src/account.ts
+++ b/packages/backend/src/account.ts
@@ -1,20 +1,22 @@
 import { createPublicClient, createWalletClient, http} from 'viem'
 import { privateKeyToAccount } from 'viem/accounts'
-import { optimismSepolia } from "viem/chains"
 import { PRIVATE_KEY } from './constants'
+import getNetwork from './getNetwork';
 
 // create an account from the private key
 export const account = privateKeyToAccount(PRIVATE_KEY)
 
+const chain = getNetwork();
+
 // a public client for reading data
 export const publicClient = createPublicClient({
-    chain: optimismSepolia,
+    chain,
     transport: http()
 })
 
 // a wallet client for signing transactions
 export const walletClient = createWalletClient({
     account,
-    chain: optimismSepolia,
+    chain,
     transport: http()
 })
diff --git a/packages/backend/src/constants.ts b/packages/backend/src/constants.ts
index 2f20d61..32a8d4d 100644
--- a/packages/backend/src/constants.ts
+++ b/packages/backend/src/constants.ts
@@ -1,10 +1,7 @@
 import dotenv from 'dotenv'
 dotenv.config()
 
-export const HATS_ADDRESS = "0x3bc1A0Ad72417f2d411118085256fC53CBdDd137"
-export const SEMAPHORE_ADDRESS = "0x71B93f8b0583f4033FAA1EE47d448B572933cefe"
 export const HAT_ID = process.env.HAT_ID || "0"
-export const CHAIN_ID = "11155420"
 export const PRIVATE_KEY = process.env.ETH_PRIVATE_KEY && process.env.ETH_PRIVATE_KEY.startsWith("0x") ? process.env.ETH_PRIVATE_KEY as `0x${string}` : `0x${process.env.ETH_PRIVATE_KEY}` as `0x${string}`
 export const PORT = Number.parseInt(process.env.PORT!) || 3001
 export const BIND_IP = process.env.BIND_IP || "0.0.0.0"
diff --git a/packages/backend/src/getNetwork.ts b/packages/backend/src/getNetwork.ts
new file mode 100644
index 0000000..b0488da
--- /dev/null
+++ b/packages/backend/src/getNetwork.ts
@@ -0,0 +1,16 @@
+import { optimism, optimismSepolia } from "viem/chains";
+import dotenv from "dotenv";
+dotenv.config();
+
+export default function getNetwork() {
+  const network = process.argv[3];
+
+  switch (network) {
+    case "optimism":
+      return optimism;
+    case "optimism-sepolia":
+      return optimismSepolia;
+    default:
+      return optimismSepolia;
+  }
+}
diff --git a/packages/backend/src/hats.ts b/packages/backend/src/hats.ts
index f74912d..b506df5 100644
--- a/packages/backend/src/hats.ts
+++ b/packages/backend/src/hats.ts
@@ -1,13 +1,13 @@
 import { HatsClient } from '@hatsprotocol/sdk-v1-core'
 import { type PublicClient } from 'viem'
-import { optimismSepolia } from "viem/chains"
 import { publicClient, walletClient } from './account'
+import getNetwork from './getNetwork'
 
 /**
  * Create a write-enabled hats client 
  */
 export const hatsClient = new HatsClient({
-    chainId: optimismSepolia.id,
+    chainId: getNetwork().id,
     publicClient: publicClient as unknown as PublicClient,
     walletClient,
 })
diff --git a/packages/interface/src/config.ts b/packages/interface/src/config.ts
index 69bd50c..3cb828a 100644
--- a/packages/interface/src/config.ts
+++ b/packages/interface/src/config.ts
@@ -46,11 +46,13 @@ const easSchemaRegistryContractAddresses = {
 
 // Hats contract addresses for each chain
 const hatsContractAddresses = {
+  optimism: "0x3bc1A0Ad72417f2d411118085256fC53CBdDd137",
   optimismSepolia: "0x3bc1A0Ad72417f2d411118085256fC53CBdDd137",
 };
 
 // Semaphore contract addresses for each chain
 const semaphoreContractAddresses = {
+  optimism: process.env.NEXT_PUBLIC_SEMAPHORE_CONTRACT_ADDRESS!,
   optimismSepolia: process.env.NEXT_PUBLIC_SEMAPHORE_CONTRACT_ADDRESS!,
 };
 
@@ -73,6 +75,8 @@ export const semaphoreEthersChain = (): string => {
  */
 export const getRPCURL = (): string | undefined => {
   switch (process.env.NEXT_PUBLIC_CHAIN_NAME) {
+    case "optimism":
+      return `https://opt-mainnet.g.alchemy.com/v2/${process.env.NEXT_PUBLIC_ALCHEMY_ID!}`;
     case "optimismSepolia":
       return `https://opt-sepolia.g.alchemy.com/v2/${process.env.NEXT_PUBLIC_ALCHEMY_ID!}`;
     default:
@@ -86,6 +90,8 @@ export const getRPCURL = (): string | undefined => {
  */
 export const getPimlicoRPCURL = (): string | undefined => {
   switch (process.env.NEXT_PUBLIC_CHAIN_NAME) {
+    case "optimism":
+      return `https://api.pimlico.io/v2/optimism/rpc?apikey=${process.env.NEXT_PUBLIC_PIMLICO_API_KEY}`;
     case "optimismSepolia":
       return `https://api.pimlico.io/v2/optimism-sepolia/rpc?apikey=${process.env.NEXT_PUBLIC_PIMLICO_API_KEY}`;
     default: