diff --git a/.changeset/fix-wcnamespace-caip-network-id.md b/.changeset/fix-wcnamespace-caip-network-id.md
new file mode 100644
index 0000000000..2fa205f67b
--- /dev/null
+++ b/.changeset/fix-wcnamespace-caip-network-id.md
@@ -0,0 +1,6 @@
+---
+"@reown/appkit-controllers": patch
+"@reown/appkit-utils": patch
+---
+
+Fix `createNamespaces` using `id` to reconstruct CAIP network ID instead of the existing `caipNetworkId` property. For standard chains these are equivalent, but for custom chains (e.g. Neo3, Stellar) where the chain `id` differs from the CAIP-2 chain reference, the wrong namespace was sent to wallets over WalletConnect. Also fixes `rpcMap` keys to use the full `caipNetworkId`.
diff --git a/packages/appkit-utils/src/WCNamespaceUtil.ts b/packages/appkit-utils/src/WCNamespaceUtil.ts
index 1ba1e43795..947eb72188 100644
--- a/packages/appkit-utils/src/WCNamespaceUtil.ts
+++ b/packages/appkit-utils/src/WCNamespaceUtil.ts
@@ -65,15 +65,13 @@ export function createDefaultNamespace(chainNamespace: string): Namespace {
 
 export function createNamespaces(caipNetworks: CaipNetwork[]): NamespaceConfig {
   return caipNetworks.reduce<NamespaceConfig>((acc, chain) => {
-    const { id, chainNamespace, rpcUrls } = chain
+    const { caipNetworkId, chainNamespace, rpcUrls } = chain
     const rpcUrl = rpcUrls.default.http[0]
 
     if (!acc[chainNamespace]) {
       acc[chainNamespace] = createDefaultNamespace(chainNamespace)
     }
 
-    const caipNetworkId = `${chainNamespace}:${id}`
-
     // eslint-disable-next-line @typescript-eslint/non-nullable-type-assertion-style
     const namespace = acc[chainNamespace]
 
@@ -91,7 +89,7 @@ export function createNamespaces(caipNetworks: CaipNetwork[]): NamespaceConfig {
     }
 
     if (namespace?.rpcMap && rpcUrl) {
-      namespace.rpcMap[id] = rpcUrl
+      namespace.rpcMap[caipNetworkId] = rpcUrl
     }
 
     return acc
diff --git a/packages/controllers/src/utils/WalletConnectUtil.ts b/packages/controllers/src/utils/WalletConnectUtil.ts
index 465519faf6..8bbd647b44 100644
--- a/packages/controllers/src/utils/WalletConnectUtil.ts
+++ b/packages/controllers/src/utils/WalletConnectUtil.ts
@@ -203,15 +203,13 @@ export const WcHelpersUtil = {
     configOverride?: OptionsControllerState['universalProviderConfigOverride']
   ): NamespaceConfig {
     const defaultNamespaces = caipNetworks.reduce<NamespaceConfig>((acc, chain) => {
-      const { id, chainNamespace, rpcUrls } = chain
+      const { caipNetworkId, chainNamespace, rpcUrls } = chain
       const rpcUrl = rpcUrls.default.http[0]
 
       if (!acc[chainNamespace]) {
         acc[chainNamespace] = this.createDefaultNamespace(chainNamespace)
       }
 
-      const caipNetworkId = `${chainNamespace}:${id}`
-
       // eslint-disable-next-line @typescript-eslint/non-nullable-type-assertion-style
       const namespace = acc[chainNamespace]
 
@@ -229,7 +227,7 @@ export const WcHelpersUtil = {
       }
 
       if (namespace?.rpcMap && rpcUrl) {
-        namespace.rpcMap[id] = rpcUrl
+        namespace.rpcMap[caipNetworkId] = rpcUrl
       }
 
       return acc
diff --git a/packages/controllers/tests/utils/WalletConnectUtil.test.ts b/packages/controllers/tests/utils/WalletConnectUtil.test.ts
index 92a866a104..e71e9fce01 100644
--- a/packages/controllers/tests/utils/WalletConnectUtil.test.ts
+++ b/packages/controllers/tests/utils/WalletConnectUtil.test.ts
@@ -158,8 +158,8 @@ describe('WcHelpersUtil', () => {
           events: ['accountsChanged', 'chainChanged'],
           chains: ['eip155:1', 'eip155:137'],
           rpcMap: {
-            '1': 'https://mainnet.infura.io/v3/YOUR-PROJECT-ID',
-            '137': 'https://polygon.rpc.com'
+            'eip155:1': 'https://mainnet.infura.io/v3/YOUR-PROJECT-ID',
+            'eip155:137': 'https://polygon.rpc.com'
           }
         },
         solana: {
@@ -179,8 +179,8 @@ describe('WcHelpersUtil', () => {
             'solana:8E9rvCKLFQia2Y35HXjjpWzj8weVo44K'
           ],
           rpcMap: {
-            '5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp': 'https://api.mainnet-beta.solana.com',
-            EtWTRABZaYq6iMfeYKouRu166VU2xqa1: 'https://api.mainnet-beta.solana.com'
+            'solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp': 'https://api.mainnet-beta.solana.com',
+            'solana:EtWTRABZaYq6iMfeYKouRu166VU2xqa1': 'https://api.mainnet-beta.solana.com'
           }
         }
       })
@@ -190,6 +190,25 @@ describe('WcHelpersUtil', () => {
       const namespaces = WcHelpersUtil.createNamespaces([])
       expect(namespaces).toEqual({})
     })
+
+    test('uses caipNetworkId directly when id differs from caip chain reference (custom chains)', () => {
+      const customNetwork: CaipNetwork = {
+        id: 1,
+        chainNamespace: 'neo3',
+        caipNetworkId: 'neo3:MainNet',
+        name: 'Neo3 MainNet',
+        nativeCurrency: { name: 'GAS', symbol: 'GAS', decimals: 8 },
+        rpcUrls: { default: { http: ['https://mainnet1.neo.coz.io'] } }
+      } as unknown as CaipNetwork
+
+      const namespaces = WcHelpersUtil.createNamespaces([customNetwork])
+
+      expect(namespaces['neo3']?.chains).toContain('neo3:MainNet')
+      expect(namespaces['neo3']?.chains).not.toContain('neo3:1')
+      expect(namespaces['neo3']?.rpcMap).toEqual({
+        'neo3:MainNet': 'https://mainnet1.neo.coz.io'
+      })
+    })
   })
 
   describe('getChainsFromNamespaces', () => {