diff --git a/src/THORChain/Swap.cpp b/src/THORChain/Swap.cpp
index 260337675e3..8272b9913a0 100644
--- a/src/THORChain/Swap.cpp
+++ b/src/THORChain/Swap.cpp
@@ -63,6 +63,8 @@ TWCoinType chainCoinType(Chain chain) {
         return TWCoinTypeCosmos;
     case Chain::BSC:
         return TWCoinTypeSmartChain;
+    case Chain::BASE:
+        return TWCoinTypeBase;
     case Chain::THOR:
     default:
         return TWCoinTypeTHORChain;
@@ -89,6 +91,8 @@ std::string chainName(Chain chain) {
         return "LTC";
     case Chain::ATOM:
         return "GAIA";
+    case Chain::BASE:
+        return "BASE";
     case Chain::THOR:
     default:
         return "THOR";
@@ -128,6 +132,7 @@ SwapBundled SwapBuilder::build(bool shortened) {
     case Chain::ETH:
     case Chain::AVAX:
     case Chain::BSC:
+    case Chain::BASE:
         return buildEth(fromAmountNum, memo);
     }
     default:
diff --git a/src/THORChain/Swap.h b/src/THORChain/Swap.h
index 94f35c5b8a3..eaab011f130 100644
--- a/src/THORChain/Swap.h
+++ b/src/THORChain/Swap.h
@@ -27,6 +27,7 @@ enum Chain {
     ATOM = 7,
     AVAX = 8,
     BSC = 9,
+    BASE = 10,
 };
 
 using SwapErrorCode = int;
diff --git a/src/THORChain/TWSwap.cpp b/src/THORChain/TWSwap.cpp
index eb5ef647a02..ceed6d9b0b5 100644
--- a/src/THORChain/TWSwap.cpp
+++ b/src/THORChain/TWSwap.cpp
@@ -71,7 +71,8 @@ TWData* _Nonnull TWTHORChainSwapBuildSwap(TWData* _Nonnull input) {
 
         case THORChainSwap::Proto::ETH:
         case THORChainSwap::Proto::BSC:
-        case THORChainSwap::Proto::AVAX: {
+        case THORChainSwap::Proto::AVAX:
+        case THORChainSwap::Proto::BASE: {
             Ethereum::Proto::SigningInput ethInput;
             if (!ethInput.ParseFromArray(txInput.data(), static_cast<int>(txInput.size()))) {
                 outputProto.mutable_error()->set_code(THORChainSwap::Proto::ErrorCode::Error_Input_proto_deserialization);
diff --git a/src/proto/THORChainSwap.proto b/src/proto/THORChainSwap.proto
index 69b6d257e16..6e3f20ff6ce 100644
--- a/src/proto/THORChainSwap.proto
+++ b/src/proto/THORChainSwap.proto
@@ -20,6 +20,7 @@ enum Chain {
     ATOM = 7;
     AVAX = 8;
     BSC = 9;
+    BASE = 10;
 }
 
 // Predefined error codes