diff --git a/plugins/acpPlugin/src/acpPlugin.ts b/plugins/acpPlugin/src/acpPlugin.ts
index 9c1622df..df0d0de3 100644
--- a/plugins/acpPlugin/src/acpPlugin.ts
+++ b/plugins/acpPlugin/src/acpPlugin.ts
@@ -534,6 +534,13 @@ class AcpPlugin {
         try {
           const state = await this.getAcpState();
 
+          if (state.jobs.cancelled.find(c => c.jobId === +args.jobId!)) {
+            return new ExecutableGameFunctionResponse(
+              ExecutableGameFunctionStatus.Failed,
+              "Cannot respond - this job has been cancelled"
+            );
+          }
+
           const job = state.jobs.active.asASeller.find(
             (c) => c.jobId === +args.jobId!
           );
@@ -654,6 +661,13 @@ class AcpPlugin {
         try {
           const state = await this.getAcpState();
 
+          if (state.jobs.cancelled.find(c => c.jobId === +args.jobId!)) {
+            return new ExecutableGameFunctionResponse(
+              ExecutableGameFunctionStatus.Failed,
+              "Cannot pay - this job has been cancelled"
+            );
+          }
+
           const job = state.jobs.active.asABuyer.find(
             (c) => c.jobId === +args.jobId!
           );
@@ -779,6 +793,13 @@ class AcpPlugin {
         try {
           const state = await this.getAcpState();
 
+          if (state.jobs.cancelled.find(c => c.jobId === +args.jobId!)) {
+            return new ExecutableGameFunctionResponse(
+              ExecutableGameFunctionStatus.Failed,
+              "Cannot deliver - this job has been cancelled"
+            );
+          }
+
           const job = state.jobs.active.asASeller.find(
             (c) => c.jobId === +args.jobId!
           );
@@ -790,6 +811,14 @@ class AcpPlugin {
             );
           }
 
+          if (job.expiredAt && new Date(job.expiredAt) < new Date()) {
+            const expiredDate = new Date(job.expiredAt);
+            return new ExecutableGameFunctionResponse(
+              ExecutableGameFunctionStatus.Failed,
+              `Cannot deliver - this job has expired on ${expiredDate.toISOString()} (UTC). The buyer may need to create a new job request.`
+            );
+          }
+
           if (job.phase !== AcpJobPhasesDesc.TRANSACTION) {
             return new ExecutableGameFunctionResponse(
               ExecutableGameFunctionStatus.Failed,
diff --git a/plugins/acpPlugin/src/interface.ts b/plugins/acpPlugin/src/interface.ts
index e5355dc2..dc0ecb8c 100644
--- a/plugins/acpPlugin/src/interface.ts
+++ b/plugins/acpPlugin/src/interface.ts
@@ -49,6 +49,7 @@ export interface AcpJob {
   memo: AcpRequestMemo[];
   tweetHistory: ITweet[];
   lastUpdated: number;
+  expiredAt?: string;
 }
 
 export interface IDeliverable {