diff --git a/build.gradle.kts b/build.gradle.kts
index 8c2064f44..f33c22c1c 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -52,7 +52,7 @@ allprojects {
 }
 
 group = "exchange.dydx.abacus"
-version = "1.12.19"
+version = "1.12.20"
 
 repositories {
     google()
diff --git a/src/commonMain/kotlin/indexer/models/chain/OnChainTransactionResponse.kt b/src/commonMain/kotlin/indexer/models/chain/OnChainTransactionResponse.kt
new file mode 100644
index 000000000..0c8beb8e6
--- /dev/null
+++ b/src/commonMain/kotlin/indexer/models/chain/OnChainTransactionResponse.kt
@@ -0,0 +1,64 @@
+package indexer.models.chain
+
+import exchange.dydx.abacus.protocols.asTypedObject
+import exchange.dydx.abacus.utils.Parser
+import kotlinx.serialization.Serializable
+
+// Define the structure of the error message
+@Serializable
+data class ChainError(
+    val message: String,
+    val line: Int? = null,
+    val column: Int? = null,
+    val stack: String? = null
+) {
+    companion object {
+        val unknownError = ChainError(message = "An unknown error occurred", line = null, column = null, stack = null)
+    }
+}
+
+@Serializable
+data class OnChainTransactionErrorResponse(
+    val error: ChainError
+) {
+    companion object {
+        private val parser = Parser()
+
+        fun fromPayload(payload: String?): OnChainTransactionErrorResponse? {
+            return parser.asTypedObject<OnChainTransactionErrorResponse>(payload)
+        }
+    }
+}
+
+// Define the structure of the success message
+@Serializable
+data class ChainEvent(
+    val type: String,
+    val attributes: List<ChainEventAttribute>
+)
+
+@Serializable
+data class ChainEventAttribute(
+    val key: String,
+    val value: String
+)
+
+@Serializable
+data class OnChainTransactionSuccessResponse(
+    val height: Int? = null,
+    val hash: String? = null,
+    val code: Int? = null,
+    val tx: String,
+    val txIndex: Int? = null,
+    val gasUsed: String? = null,
+    val gasWanted: String? = null,
+    val events: List<ChainEvent>? = null,
+) {
+    companion object {
+        private val parser = Parser()
+
+        fun fromPayload(payload: String?): OnChainTransactionSuccessResponse? {
+            return parser.asTypedObject<OnChainTransactionSuccessResponse>(payload)
+        }
+    }
+}
diff --git a/v4_abacus.podspec b/v4_abacus.podspec
index b9b78cb00..2e17d52a8 100644
--- a/v4_abacus.podspec
+++ b/v4_abacus.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |spec|
     spec.name                     = 'v4_abacus'
-    spec.version                  = '1.12.19'
+    spec.version                  = '1.12.20'
     spec.homepage                 = 'https://github.com/dydxprotocol/v4-abacus'
     spec.source                   = { :http=> ''}
     spec.authors                  = ''