diff --git a/src/keeper/contracts/conditions/PaymentConditions.ts b/src/keeper/contracts/conditions/PaymentConditions.ts
index 40656cc..7cc045a 100644
--- a/src/keeper/contracts/conditions/PaymentConditions.ts
+++ b/src/keeper/contracts/conditions/PaymentConditions.ts
@@ -12,7 +12,7 @@ export default class PaymentConditions extends ContractBase {
     public async lockPayment(serviceAgreementId: string, assetId: string, price: number, consumerAddress: string)
         : Promise<Receipt> {
         return this.send("lockPayment", consumerAddress, [
-            serviceAgreementId, "0x" + assetId, price,
+            serviceAgreementId, assetId, price,
         ])
     }
 }
diff --git a/src/ocean/Ocean.ts b/src/ocean/Ocean.ts
index 23ee5be..b432ac6 100644
--- a/src/ocean/Ocean.ts
+++ b/src/ocean/Ocean.ts
@@ -67,7 +67,7 @@ export default class Ocean {
         const aquarius = AquariusProvider.getAquarius()
         const brizo = BrizoProvider.getBrizo()
 
-        const assetId: string = IdGenerator.generateId()
+        const assetId: string = IdGenerator.generatePrefixedId()
         const did: string = `did:op:${assetId}`
         const accessServiceDefinitionId: string = "0"
         const computeServiceDefintionId: string = "1"
@@ -183,7 +183,8 @@ export default class Ocean {
             event.listenOnce(async (data) => {
 
                 const sa: ServiceAgreement = new ServiceAgreement(data.returnValues.serviceAgreementId)
-                await sa.payAsset(id,
+                await sa.payAsset(
+                    id,
                     metadataService.metadata.base.price,
                     consumer,
                 )
diff --git a/src/ocean/ServiceAgreements/ServiceAgreementTemplate.ts b/src/ocean/ServiceAgreements/ServiceAgreementTemplate.ts
index a78241c..ae6423d 100644
--- a/src/ocean/ServiceAgreements/ServiceAgreementTemplate.ts
+++ b/src/ocean/ServiceAgreements/ServiceAgreementTemplate.ts
@@ -111,9 +111,9 @@ export default class ServiceAgreementTemplate extends OceanBase {
                     case "price":
                         return metadata.base.price
                     case "assetId":
-                        return "0x" + assetId
+                        return assetId
                     case "documentKeyId":
-                        return "0x" + assetId
+                        return assetId
                 }
 
                 return null
diff --git a/test/aquarius/Aquarius.test.ts b/test/aquarius/Aquarius.test.ts
index 8b8a031..cb8d8b8 100644
--- a/test/aquarius/Aquarius.test.ts
+++ b/test/aquarius/Aquarius.test.ts
@@ -85,7 +85,7 @@ describe("Aquarius", () => {
 
         it("should store a ddo", async () => {
 
-            const did: string = `did:op:${IdGenerator.generateId()}`
+            const did: string = `did:op:${IdGenerator.generatePrefixedId()}`
             const ddo: DDO = new DDO({
                 id: did,
             })
@@ -103,7 +103,7 @@ describe("Aquarius", () => {
 
         it("should store a ddo", async () => {
 
-            const did: string = `did:op:${IdGenerator.generateId()}`
+            const did: string = `did:op:${IdGenerator.generatePrefixedId()}`
             const ddo: DDO = new DDO({
                 id: did,
             })
diff --git a/test/ocean/ServiceAgreement.test.ts b/test/ocean/ServiceAgreement.test.ts
index a3aef06..c68ba7e 100644
--- a/test/ocean/ServiceAgreement.test.ts
+++ b/test/ocean/ServiceAgreement.test.ts
@@ -44,7 +44,7 @@ describe("ServiceAgreement", () => {
 
         accessService = {
             type: "Access",
-            serviceDefinitionId: IdGenerator.generateId(),
+            serviceDefinitionId: "0",
             templateId: serviceAgreementTemplate.getId(),
             conditions,
         } as Service
diff --git a/test/ocean/ServiceAgreementTemplate.test.ts b/test/ocean/ServiceAgreementTemplate.test.ts
index 8ea80f3..f351f50 100644
--- a/test/ocean/ServiceAgreementTemplate.test.ts
+++ b/test/ocean/ServiceAgreementTemplate.test.ts
@@ -49,7 +49,7 @@ describe("ServiceAgreementTemplate", () => {
                 new ServiceAgreementTemplate(access)
             assert(serviceAgreementTemplate)
 
-            const conds = await serviceAgreementTemplate.getConditions(new MetaData(), IdGenerator.generateId())
+            const conds = await serviceAgreementTemplate.getConditions(new MetaData(), IdGenerator.generatePrefixedId())
             assert(conds)
         })
     })