diff --git a/_data/chains/eip155-57.json b/_data/chains/eip155-57.json
new file mode 100644
index 00000000..88f9a788
--- /dev/null
+++ b/_data/chains/eip155-57.json
@@ -0,0 +1,20 @@
+{
+  "name": "Syscoin Mainnet",
+  "chain": "SYS",
+  "network": "mainnet",
+  "rpc": [
+    "https://nevm.syscoin.org/api/eth-rpc",
+    "https://web3.syscoin.org",
+    "wss://web3.syscoin.org"
+  ],
+  "faucets": ["https://faucet.syscoin.org"],
+  "nativeCurrency": {
+    "name": "Syscoin",
+    "symbol": "SYS",
+    "decimals": 18
+  },
+  "infoURL": "https://www.syscoin.org",
+  "shortName": "sys",
+  "chainId": 57,
+  "networkId": 57
+}
diff --git a/_data/chains/eip155-5700.json b/_data/chains/eip155-5700.json
new file mode 100644
index 00000000..260daf1a
--- /dev/null
+++ b/_data/chains/eip155-5700.json
@@ -0,0 +1,18 @@
+{
+  "name": "Syscoin Tanenbaum Testnet",
+  "chain": "SYS",
+  "network": "testnet",
+  "rpc": [
+    "https://tanenbaum.io/api/eth-rpc"
+  ],
+  "faucets": ["https://faucet.tanenbaum.io"],
+  "nativeCurrency": {
+    "name": "Testnet Syscoin",
+    "symbol": "tSYS",
+    "decimals": 18
+  },
+  "infoURL": "https://syscoin.org",
+  "shortName": "tsys",
+  "chainId": 5700,
+  "networkId": 5700
+}