diff --git a/constants/additionalChainRegistry/chainid-721529 b/constants/additionalChainRegistry/chainid-721529
new file mode 100644
index 0000000000..66bb1893a6
--- /dev/null
+++ b/constants/additionalChainRegistry/chainid-721529
@@ -0,0 +1,25 @@
+{
+  "name": "OIL Mainnet",
+  "chain": "OIL",
+  "rpc": [
+    "https://mainnet-rpc.oilscan.net",
+  ],
+  "faucets": [],
+  "nativeCurrency": {
+    "name": "Oil",
+    "symbol": "OIL",
+    "decimals": 18
+  },
+  "features": [{ "name": "EIP155" }, { "name": "EIP1559" }],
+  "infoURL": "",
+  "shortName": "oil",
+  "chainId": 721529,
+  "networkId": 721529,
+  "icon": "oilchain",
+  "explorers": [{
+    "name": "OilScan",
+    "url": "https://oilscan.net",
+    "icon": "oilscan",
+    "standard": "EIP3091"
+  }]
+}