diff --git a/src/scheduler.h b/src/scheduler.h
--- a/src/scheduler.h
+++ b/src/scheduler.h
@@ -114,6 +114,8 @@
     // until queue is empty
     // Must be called after the CScheduler has no remaining processing threads!
     void EmptyQueue();
+
+    size_t CallbacksPending();
 };
 
 #endif
diff --git a/src/scheduler.cpp b/src/scheduler.cpp
--- a/src/scheduler.cpp
+++ b/src/scheduler.cpp
@@ -197,3 +197,8 @@
         should_continue = !m_callbacks_pending.empty();
     }
 }
+
+size_t SingleThreadedSchedulerClient::CallbacksPending() {
+    LOCK(m_cs_callbacks_pending);
+    return m_callbacks_pending.size();
+}
diff --git a/src/validationinterface.h b/src/validationinterface.h
--- a/src/validationinterface.h
+++ b/src/validationinterface.h
@@ -140,6 +140,8 @@
     /** Call any remaining callbacks on the calling thread */
     void FlushBackgroundCallbacks();
 
+    size_t CallbacksPending();
+
     /** Register with mempool to call TransactionRemovedFromMempool callbacks */
     void RegisterWithMempoolSignals(CTxMemPool &pool);
     /** Unregister with mempool */
diff --git a/src/validationinterface.cpp b/src/validationinterface.cpp
--- a/src/validationinterface.cpp
+++ b/src/validationinterface.cpp
@@ -65,6 +65,13 @@
     }
 }
 
+size_t CMainSignals::CallbacksPending() {
+    if (!m_internals) {
+        return 0;
+    }
+    return m_internals->m_schedulerClient.CallbacksPending();
+}
+
 void CMainSignals::RegisterWithMempoolSignals(CTxMemPool &pool) {
     pool.NotifyEntryRemoved.connect(
         boost::bind(&CMainSignals::MempoolEntryRemoved, this, _1, _2));