diff --git a/_data/chains/eip155-3966.json b/_data/chains/eip155-3966.json
new file mode 100644
index 00000000..c672a510
--- /dev/null
+++ b/_data/chains/eip155-3966.json
@@ -0,0 +1,22 @@
+{
+  "name": "DYNO Mainnet",
+  "chain": "DYNO",
+  "rpc": [
+    "https://api.dynoprotocol.com",
+  ],
+  "faucets": [],
+  "nativeCurrency": {
+    "name": "DYNO Token",
+    "symbol": "DYNO",
+    "decimals": 18
+  },
+  "infoURL": "https://dynoprotocol.com",
+  "shortName": "dyno",
+  "chainId": 3966,
+  "networkId": 3966,
+  "explorers": [{
+    "name": "DYNO Explorer",
+    "url": "https://dynoscan.io",
+    "standard": "EIP3091"
+  }]
+}