diff --git a/_data/chains/eip155-400.json b/_data/chains/eip155-400.json
new file mode 100644
index 00000000..38b76465
--- /dev/null
+++ b/_data/chains/eip155-400.json
@@ -0,0 +1,24 @@
+{
+  "name": "HyperonChain TestNet",
+  "chain": "HPN",
+  "icon": "hyperonchain",
+  "rpc": ["https://testnet-rpc.hyperonchain.com"],
+  "faucets": ["https://faucet.hyperonchain.com"],
+  "nativeCurrency": {
+    "name": "HyperonChain",
+    "symbol": "HPN",
+    "decimals": 18
+  },
+  "infoURL": "https://docs.hyperonchain.com",
+  "shortName": "hpn",
+  "chainId": 400,
+  "networkId": 400,
+  "explorers": [
+    {
+      "name": "blockscout",
+      "url": "https://testnet.hyperonchain.com",
+      "icon": "hyperonchain",
+      "standard": "EIP3091"
+    }
+  ]
+}