diff --git a/src/composables/useGraphQL.ts b/src/composables/useGraphQL.ts
index c38c550..288fe49 100644
--- a/src/composables/useGraphQL.ts
+++ b/src/composables/useGraphQL.ts
@@ -40,21 +40,8 @@ export function useGraphQL(network: Ref<NetworkConfig>) {
     totalReleases: '0'
   });
 
-  const getGraphQLUrl = () => {
-    const rskNetworkName = isTestnetEnvironment() ? rootstockTestnet.name : rootstock.name;  
-    
-    switch (network.value.name) {
-      case sepolia.name:
-        return import.meta.env.VITE_SEPOLIA_SUBGRAPH_URL!;
-      case rskNetworkName:
-        return import.meta.env.VITE_RSK_SUBGRAPH_URL!;
-      default:
-        throw new Error(`Unsupported network: ${network.value.name}`);
-    }
-  };
-
   const executeQuery = async (query: string, variables: any = {}) => {
-    const url = getGraphQLUrl();
+    const url = network.value.subgraphUrls[0]; // TODO: try all available URLs
     
     try {
       const response = await fetch(url, {
diff --git a/src/config/networks.ts b/src/config/networks.ts
index 589beaf..5ce18d3 100644
--- a/src/config/networks.ts
+++ b/src/config/networks.ts
@@ -1,14 +1,27 @@
-import { sepolia, rootstock, rootstockTestnet } from "viem/chains";
+import { mainnet, sepolia, rootstock, rootstockTestnet } from "viem/chains";
 import { NetworkConfig } from "@/model/NetworkEnum"
 // TODO: import addresses from p2pix-smart-contracts deployments
 
-export const isTestnetEnvironment = () => {
-  return import.meta.env.VITE_ENVIRONMENT === 'testnet' || 
-         import.meta.env.NODE_ENV === 'development' ||
-         import.meta.env.MODE === 'development';
+export const Networks: {[key:string]: NetworkConfig} = {
+  mainnet: { ...mainnet,
+    rpcUrls: { default: { http: [import.meta.env.VITE_MAINNET_API_URL]}},
+    contracts: { ...mainnet.contracts,
+      p2pix: { address: import.meta.env.VITE_MAINNET_P2PIX_ADDRESS } },
+    tokens: {
+      BRZ: { address: import.meta.env.VITE_MAINNET_TOKEN_ADDRESS } },
+    subgraphUrls: [import.meta.env.VITE_MAINNET_SUBGRAPH_URL]
+  },
+  rootstock: { ...rootstock,
+    rpcUrls: { default: { http: [import.meta.env.VITE_RSK_API_URL]}},
+    contracts: { ...rootstock.contracts,
+      p2pix: { address: import.meta.env.VITE_RSK_P2PIX_ADDRESS } },
+    tokens: {
+      BRZ: { address: import.meta.env.VITE_RSK_TOKEN_ADDRESS } },
+    subgraphUrls: [import.meta.env.VITE_RSK_SUBGRAPH_URL]
+  },
 };
 
-export const Networks: {[key:string]: NetworkConfig} = {
+export const NetworksTestnet: {[key:string]: NetworkConfig} = {
   sepolia: { ...sepolia,
     rpcUrls: { default: { http: [import.meta.env.VITE_SEPOLIA_API_URL]}},
     contracts: { ...sepolia.contracts,
@@ -17,9 +30,9 @@ export const Networks: {[key:string]: NetworkConfig} = {
       BRZ: { address: import.meta.env.VITE_SEPOLIA_TOKEN_ADDRESS } },
     subgraphUrls: [import.meta.env.VITE_SEPOLIA_SUBGRAPH_URL]
   },
-  rootstock: { ...(isTestnetEnvironment() ? rootstockTestnet : rootstock),
+  rootstockTestnet: { ...rootstockTestnet,
     rpcUrls: { default: { http: [import.meta.env.VITE_RSK_API_URL]}},
-    contracts: { ...(isTestnetEnvironment() ? rootstockTestnet.contracts : rootstock.contracts),
+    contracts: { ...rootstockTestnet.contracts,
       p2pix: { address: import.meta.env.VITE_RSK_P2PIX_ADDRESS } },
     tokens: {
       BRZ: { address: import.meta.env.VITE_RSK_TOKEN_ADDRESS } },
@@ -27,4 +40,4 @@ export const Networks: {[key:string]: NetworkConfig} = {
   },
 };
 
-export const DEFAULT_NETWORK = Networks.sepolia;
+export const DEFAULT_NETWORK = Networks.mainnet;