diff --git a/constants/additionalChainRegistry/chainid-984.js b/constants/additionalChainRegistry/chainid-984.js
new file mode 100644
index 0000000000..e2478221a0
--- /dev/null
+++ b/constants/additionalChainRegistry/chainid-984.js
@@ -0,0 +1,27 @@
+export const data = {
+    "name": "OPN Chain Testnet",
+    "chain": "OPN",
+    "rpc": [
+      "https://testnet-rpc.iopn.tech",
+    ],
+    "faucets": [
+      "https://faucet.iopn.tech"
+    ],
+    "nativeCurrency": {
+      "name": "OPN",
+      "symbol": "OPN",
+      "decimals": 18
+    },
+    "features": [{ "name": "EIP155" }, { "name": "EIP1559" }, {"name": "EIP7702"}],
+    "infoURL": "https://iopn.io/opn-chain",
+    "shortName": "opn",
+    "chainId": 984,
+    "networkId": 984,
+    "icon": "opn",
+    "explorers": [{
+      "name": "OPN Explorer",
+      "url": "https://testnet.iopn.tech",
+      "icon": "opn",
+      "standard": "none"
+    }]
+  }
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