diff --git a/_data/chains/eip155-1688.json b/_data/chains/eip155-1688.json
index 2dcaf4c8..a70f580a 100644
--- a/_data/chains/eip155-1688.json
+++ b/_data/chains/eip155-1688.json
@@ -2,7 +2,7 @@
   "name": "LUDAN Mainnet",
   "chain": "LUDAN",
   "rpc": [
-    "http://rpc.ludan.org:55001/"
+    "https://rpc.ludan.org/"
   ],
   "faucets": [],
   "nativeCurrency": {
diff --git a/_data/chains/eip155-300.json b/_data/chains/eip155-300.json
new file mode 100644
index 00000000..fb5b4f86
--- /dev/null
+++ b/_data/chains/eip155-300.json
@@ -0,0 +1,24 @@
+{
+  "name": "Optimism on Gnosis Chain",
+  "chain": "OGC",
+  "rpc": [
+    "https://optimism.gnosischain.com",
+    "wss://optimism.gnosischain.com/wss"
+  ],
+  "faucets": ["https://faucet.gimlu.com/gnosis"],
+  "nativeCurrency": {
+    "name": "xDAI",
+    "symbol": "xDAI",
+    "decimals": 18
+  },
+  "infoURL": "https://www.xdaichain.com/for-developers/optimism-optimistic-rollups-on-gc",
+  "shortName": "ogc",
+  "chainId": 300,
+  "networkId": 300,
+  "explorers": [{
+    "name": "blockscout",
+    "url": "https://blockscout.com/xdai/optimism",
+    "icon": "blockscout",
+    "standard": "EIP3091"
+  }]
+}