diff --git a/.changeset/selfish-experts-lay.md b/.changeset/selfish-experts-lay.md
new file mode 100644
index 00000000..ded92419
--- /dev/null
+++ b/.changeset/selfish-experts-lay.md
@@ -0,0 +1,6 @@
+---
+"@wagmi/chains": patch
+---
+
+Updated syscoin.
+Added rollux, rolluxTestnet & syscoinTestnet.
diff --git a/packages/chains/src/rollux.ts b/packages/chains/src/rollux.ts
new file mode 100644
index 00000000..149f6c4f
--- /dev/null
+++ b/packages/chains/src/rollux.ts
@@ -0,0 +1,28 @@
+import { Chain } from './types'
+
+export const rollux = {
+  id: 570,
+  name: 'Rollux Mainnet',
+  network: 'rollux',
+  nativeCurrency: {
+    decimals: 18,
+    name: 'Syscoin',
+    symbol: 'SYS',
+  },
+  rpcUrls: {
+    default: {
+      http: ['https://rpc.rollux.com'],
+      websocket: ['wss://rpc.rollux.com/wss']
+    },
+    public: { http: ['https://rollux.public-rpc.com'] },
+  },
+  blockExplorers: {
+    default: { name: 'RolluxExplorer', url: 'https://explorer.rollux.com' },
+  },
+  contracts: {
+    multicall3: {
+      address: '0xcA11bde05977b3631167028862bE2a173976CA11',
+      blockCreated: 119222,
+    },
+  },
+} as const satisfies Chain
diff --git a/packages/chains/src/rolluxTestnet.ts b/packages/chains/src/rolluxTestnet.ts
new file mode 100644
index 00000000..536527da
--- /dev/null
+++ b/packages/chains/src/rolluxTestnet.ts
@@ -0,0 +1,28 @@
+import { Chain } from './types'
+
+export const rolluxTestnet = {
+  id: 57000,
+  name: 'Rollux Testnet',
+  network: 'rollux-testnet',
+  nativeCurrency: {
+    decimals: 18,
+    name: 'Syscoin',
+    symbol: 'SYS',
+  },
+  rpcUrls: {
+    default: {
+      http: ['https://rpc-tanenbaum.rollux.com/'],
+      websocket: ['wss://rpc-tanenbaum.rollux.com/wss']
+    },
+    public: { http: ['https://rpc-tanenbaum.rollux.com/'] },
+  },
+  blockExplorers: {
+    default: { name: 'RolluxTestnetExplorer', url: 'https://rollux.tanenbaum.io' },
+  },
+  contracts: {
+    multicall3: {
+      address: '0xcA11bde05977b3631167028862bE2a173976CA11',
+      blockCreated: 1813675,
+    },
+  },
+} as const satisfies Chain
diff --git a/packages/chains/src/syscoin.ts b/packages/chains/src/syscoin.ts
index 7aaba68b..27e08585 100644
--- a/packages/chains/src/syscoin.ts
+++ b/packages/chains/src/syscoin.ts
@@ -5,21 +5,27 @@ export const syscoin = {
   name: 'Syscoin Mainnet',
   network: 'syscoin',
   nativeCurrency: {
-    decimals: 8,
+    decimals: 18,
     name: 'Syscoin',
     symbol: 'SYS',
   },
   rpcUrls: {
-    default: { http: ['https://rpc.syscoin.org'] },
-    public: { http: ['https://rpc.syscoin.org'] },
+    default: {
+      http: ['https://rpc.syscoin.org'],
+      websocket: ['wss://rpc.syscoin.org/wss']
+    },
+    public: {
+      http: ['https://rpc.syscoin.org'],
+      websocket: ['wss://rpc.syscoin.org/wss']
+    },
   },
   blockExplorers: {
     default: { name: 'SyscoinExplorer', url: 'https://explorer.syscoin.org' },
   },
   contracts: {
     multicall3: {
-      address: '0x000562033783B1136159E10d976B519C929cdE8e',
-      blockCreated: 80637,
+      address: '0xcA11bde05977b3631167028862bE2a173976CA11',
+      blockCreated: 287139,
     },
   },
 } as const satisfies Chain
diff --git a/packages/chains/src/syscoinTestnet.ts b/packages/chains/src/syscoinTestnet.ts
new file mode 100644
index 00000000..106f75cb
--- /dev/null
+++ b/packages/chains/src/syscoinTestnet.ts
@@ -0,0 +1,28 @@
+import { Chain } from './types'
+
+export const syscoinTestnet = {
+  id: 5700,
+  name: 'Syscoin Tanenbaum Testnet',
+  network: 'syscoin-testnet',
+  nativeCurrency: {
+    decimals: 18,
+    name: 'Syscoin',
+    symbol: 'SYS',
+  },
+  rpcUrls: {
+    default: {
+      http: ['https://rpc.tanenbaum.io'],
+      websocket: ['wss://rpc.tanenbaum.io/wss']
+    },
+    public: { http: ['https://rpc.tanenbaum.io'] },
+  },
+  blockExplorers: {
+    default: { name: 'SyscoinTestnetExplorer', url: 'https://tanenbaum.io' },
+  },
+  contracts: {
+    multicall3: {
+      address: '0xcA11bde05977b3631167028862bE2a173976CA11',
+      blockCreated: 271288,
+    },
+  },
+} as const satisfies Chain