diff --git a/packages/mesh-common/src/types/protocol.ts b/packages/mesh-common/src/types/protocol.ts
index 0a4d380b1..109299b49 100644
--- a/packages/mesh-common/src/types/protocol.ts
+++ b/packages/mesh-common/src/types/protocol.ts
@@ -1,5 +1,11 @@
 import { DEFAULT_PROTOCOL_PARAMETERS } from "../constants";
 
+export type CostModels = {
+  PlutusV1?: number[];
+  PlutusV2?: number[];
+  PlutusV3?: number[];
+};
+
 export type Protocol = {
   epoch: number;
   minFeeA: number;
@@ -22,12 +28,14 @@ export type Protocol = {
   maxCollateralInputs: number;
   coinsPerUtxoSize: number;
   minFeeRefScriptCostPerByte: number;
+  costModels?: CostModels;
 };
 
 export const castProtocol = (
   data: Partial<Record<keyof Protocol, any>>,
 ): Protocol => {
-  const result: Partial<Record<keyof Protocol, number | string>> = {};
+  const result: Partial<Record<keyof Protocol, number | string | CostModels>> =
+    {};
 
   for (const rawKey in DEFAULT_PROTOCOL_PARAMETERS) {
     const key = rawKey as keyof Protocol;
@@ -40,5 +48,9 @@ export const castProtocol = (
     }
   }
 
+  if (data.costModels && typeof data.costModels === "object") {
+    result.costModels = data.costModels as CostModels;
+  }
+
   return result as Protocol;
 };
diff --git a/packages/mesh-common/test/types/protocol.test.ts b/packages/mesh-common/test/types/protocol.test.ts
index b04b34865..ca7e3d1f8 100644
--- a/packages/mesh-common/test/types/protocol.test.ts
+++ b/packages/mesh-common/test/types/protocol.test.ts
@@ -75,5 +75,19 @@ describe("Protocol", () => {
       expect(casted.epoch).toBe(correct.epoch);
       expect(casted.decentralisation).toBe(correct.decentralisation);
     });
+
+    it("should preserve costModels when provided", () => {
+      const v3 = [100788, 420, 1, 1, 1000];
+      const casted = castProtocol({ costModels: { PlutusV3: v3 } });
+
+      expect(casted.costModels).toBeDefined();
+      expect(casted.costModels?.PlutusV3).toEqual(v3);
+    });
+
+    it("should leave costModels undefined when not provided", () => {
+      const casted = castProtocol({ minFeeA: 44 });
+
+      expect(casted.costModels).toBeUndefined();
+    });
   });
 });
diff --git a/packages/mesh-core-cst/src/serializer/index.ts b/packages/mesh-core-cst/src/serializer/index.ts
index 613640acc..b7b8b9dce 100644
--- a/packages/mesh-core-cst/src/serializer/index.ts
+++ b/packages/mesh-core-cst/src/serializer/index.ts
@@ -1528,15 +1528,15 @@ class CardanoSDKSerializerCore {
 
     // After building tx witness set, we must hash it with the cost models
     // and put the hash in the tx body
-    let costModelV1 = Serialization.CostModel.newPlutusV1(
-      DEFAULT_V1_COST_MODEL_LIST,
-    );
-    let costModelV2 = Serialization.CostModel.newPlutusV2(
-      DEFAULT_V2_COST_MODEL_LIST,
-    );
-    let costModelV3 = Serialization.CostModel.newPlutusV3(
-      DEFAULT_V3_COST_MODEL_LIST,
-    );
+    let v1CostList =
+      this.protocolParams.costModels?.PlutusV1 ?? DEFAULT_V1_COST_MODEL_LIST;
+    let v2CostList =
+      this.protocolParams.costModels?.PlutusV2 ?? DEFAULT_V2_COST_MODEL_LIST;
+    let v3CostList =
+      this.protocolParams.costModels?.PlutusV3 ?? DEFAULT_V3_COST_MODEL_LIST;
+    let costModelV1 = Serialization.CostModel.newPlutusV1(v1CostList);
+    let costModelV2 = Serialization.CostModel.newPlutusV2(v2CostList);
+    let costModelV3 = Serialization.CostModel.newPlutusV3(v3CostList);
     let costModels = new Serialization.Costmdls();
 
     if (this.usedLanguages[PlutusLanguageVersion.V1]) {