diff --git a/.changeset/nasty-cats-greet.md b/.changeset/nasty-cats-greet.md
new file mode 100644
index 00000000..46f16d39
--- /dev/null
+++ b/.changeset/nasty-cats-greet.md
@@ -0,0 +1,5 @@
+---
+'@blocto/sdk': patch
+---
+
+support Merlin Chain (BTC L2)
diff --git a/packages/blocto-sdk/src/constants.ts b/packages/blocto-sdk/src/constants.ts
index 13af16a6..bc485e97 100644
--- a/packages/blocto-sdk/src/constants.ts
+++ b/packages/blocto-sdk/src/constants.ts
@@ -69,7 +69,12 @@ export const ETH_RPC_LIST: Mapping = {
   // Blast
   81457: 'https://rpc.blast.io',
   // Blast Sepolia Testnet
-  168587773: 'https://sepolia.blast.io'
+  168587773: 'https://sepolia.blast.io',
+
+  // Merlin Chain
+  4200: 'https://rpc.merlinchain.io',
+  // Merlin Testnet
+  686868: 'https://testnet-rpc.merlinchain.io',
 };
 
 export const ETH_ENV_WALLET_SERVER_MAPPING: Mapping = {