diff --git a/src/plugins/oSnap/components/Input/SelectSafe.vue b/src/plugins/oSnap/components/Input/SelectSafe.vue
index 5717db43..2413868f 100644
--- a/src/plugins/oSnap/components/Input/SelectSafe.vue
+++ b/src/plugins/oSnap/components/Input/SelectSafe.vue
@@ -18,8 +18,11 @@ const isModalOpen = ref(false);
   <div class="mb-2">
     <TuneButtonSelect
       :model-value="
-        safes.find(safe => safe.safeAddress === selectedSafe?.safeAddress)
-          ?.safeName || 'Select Safe'
+        safes.find(
+          safe =>
+            safe.safeAddress === selectedSafe?.safeAddress &&
+            safe.network === selectedSafe.network
+        )?.safeName || 'Select Safe'
       "
       @select="isModalOpen = true"
     />
diff --git a/src/plugins/oSnap/components/TransactionBuilder/ModalSafe.vue b/src/plugins/oSnap/components/TransactionBuilder/ModalSafe.vue
index 3b0ac9e1..c2dcd5b1 100644
--- a/src/plugins/oSnap/components/TransactionBuilder/ModalSafe.vue
+++ b/src/plugins/oSnap/components/TransactionBuilder/ModalSafe.vue
@@ -33,7 +33,10 @@ function makeSafeDescription(safe: GnosisSafe) {
     <div class="mx-0 my-4 flex flex-col space-y-3 md:mx-4">
       <button v-for="(safe, key) in safes" :key="key" @click="select(safe)">
         <BaseModalSelectItem
-          :selected="safe.safeAddress === selected?.safeAddress"
+          :selected="
+            safe.safeAddress === selected?.safeAddress &&
+            safe.network === selected.network
+          "
           :title="safe.safeName"
           :description="makeSafeDescription(safe)"
         />
diff --git a/src/plugins/oSnap/constants.ts b/src/plugins/oSnap/constants.ts
index 44b6a08e..c2f60b49 100644
--- a/src/plugins/oSnap/constants.ts
+++ b/src/plugins/oSnap/constants.ts
@@ -1107,6 +1107,7 @@ export const EXPLORER_API_URLS = {
   '137': 'https://api.polygonscan.com/api',
   '56': 'https://api.bscscan.com/api',
   '42161': 'https://api.arbiscan.io/api',
+  '8453' : 'https://api.basescan.org/api',
   // '1116': Add 'https://openapi.coredao.org/api' if API key requirement is removed
   '11155111': 'https://api-sepolia.etherscan.io/api',
 } as const;
@@ -1116,6 +1117,7 @@ export const GNOSIS_SAFE_TRANSACTION_API_URLS = {
   '5': 'https://safe-transaction-goerli.safe.global/api',
   '10': 'https://safe-transaction-optimism.safe.global/api',
   '100': 'https://safe-transaction-gnosis-chain.safe.global/api',
+  '8453': 'https://safe-transaction-base.safe.global/api',
   '73799': 'https://safe-transaction-volta.safe.global/api',
   '246': 'https://safe-transaction-ewc.safe.global/api',
   '137': 'https://safe-transaction-polygon.safe.global/api',
@@ -1135,6 +1137,7 @@ export const SAFE_APP_URLS = {
   '56': 'https://app.safe.global/apps/open',
   '42161': 'https://app.safe.global/apps/open',
   '1116': 'https://safe.coredao.org/apps/open',
+  '8453': 'https://app.safe.global/apps/open',
   '11155111': 'https://app.safe.global/apps/open',
 } as const;
 
@@ -1445,6 +1448,15 @@ export const contractData = [
       'https://thegraph.coredao.org/subgraphs/name/umaprotocol/core-optimistic-oracle-v3',
     deployBlock: 11341063
   },
+  {
+    // base
+    network: '8453',
+    name: 'OptimisticOracleV3',
+    address: '0x2aBf1Bd76655de80eDB3086114315Eec75AF500c',
+    subgraph:
+      'https://api.studio.thegraph.com/query/1057/base-optimistic-oracle-v3/version/latest',
+    deployBlock: 12066343
+  },
   {
     // sepolia
     network: '11155111',
@@ -1527,6 +1539,15 @@ export const contractData = [
     subgraph:
     'https://thegraph.coredao.org/subgraphs/name/umaprotocol/core-optimistic-governor'
   },
+  {
+    // base
+    network: '8453',
+    name: 'OptimisticGovernor',
+    address: '0x80bCA2E1c272239AdFDCdc87779BC8Af6E12e633',
+    deployBlock: 13062540,
+    subgraph:
+    'https://api.studio.thegraph.com/query/1057/base-optimistic-governor/version/latest'
+  },
   {
     // sepolia
     network: '11155111',
diff --git a/src/plugins/safeSnap/constants.ts b/src/plugins/safeSnap/constants.ts
index 839e03f2..46bed48b 100644
--- a/src/plugins/safeSnap/constants.ts
+++ b/src/plugins/safeSnap/constants.ts
@@ -358,6 +358,7 @@ export const MULTI_SEND_V1_3_0 = {
   '1285': '0xA238CBeb142c10Ef7Ad8442C6D1f9E89e07e7761',
   '1287': '0xA238CBeb142c10Ef7Ad8442C6D1f9E89e07e7761',
   '4002': '0xA238CBeb142c10Ef7Ad8442C6D1f9E89e07e7761',
+  '8453': '0xA238CBeb142c10Ef7Ad8442C6D1f9E89e07e7761',
   '42161': '0xA238CBeb142c10Ef7Ad8442C6D1f9E89e07e7761',
   '42220': '0x998739BFdAAdde7C933B942a68053933098f9EDa',
   '43114': '0x998739BFdAAdde7C933B942a68053933098f9EDa',
@@ -400,7 +401,7 @@ export type ContractData = {
   network: string;
   name: string;
   address?: string;
-  deployBlockNumber?: number;
+  deployBlock?: number;
   subgraph?: string;
 };
 // contract addresses pulled from https://github.com/UMAprotocol/protocol/tree/master/packages/core/networks
@@ -477,6 +478,15 @@ export const contractData: ContractData[] = [
       'https://thegraph.coredao.org/subgraphs/name/umaprotocol/core-optimistic-oracle-v3',
     deployBlock: 11341063
   },
+  {
+    // base
+    network: '8453',
+    name: 'OptimisticOracleV3',
+    address: '0x2aBf1Bd76655de80eDB3086114315Eec75AF500c',
+    subgraph:
+      'https://api.studio.thegraph.com/query/1057/base-optimistic-oracle-v3/version/latest',
+    deployBlock: 12066343
+  },
   {
     // sepolia
     network: '11155111',
@@ -559,6 +569,15 @@ export const contractData: ContractData[] = [
     subgraph:
       'https://thegraph.coredao.org/subgraphs/name/umaprotocol/core-optimistic-governor'
   },
+  {
+    // base
+    network: '8453',
+    name: 'OptimisticGovernor',
+    address: '0x80bCA2E1c272239AdFDCdc87779BC8Af6E12e633',
+    deployBlock: 13062540,
+    subgraph:
+    'https://api.studio.thegraph.com/query/1057/base-optimistic-governor/version/latest'
+  },
   {
     // sepolia
     network: '11155111',