diff --git a/src/main/tjava/com/r35157/jupiterperpsalarm/impl/ref/PriceAlarm.tjava b/src/main/tjava/com/r35157/jupiterperpsalarm/impl/ref/PriceAlarm.tjava
index 13ad000..0022445 100644
--- a/src/main/tjava/com/r35157/jupiterperpsalarm/impl/ref/PriceAlarm.tjava
+++ b/src/main/tjava/com/r35157/jupiterperpsalarm/impl/ref/PriceAlarm.tjava
@@ -1,5 +1,7 @@
 package com.r35157.jupiterperpsalarm.impl.ref;
 
+import java.time.Instant;
+
 public final class PriceAlarm {
 
     public PriceAlarm(PriceAlarmDefinition definition, AlarmAction action) {
@@ -25,16 +27,27 @@ public final class PriceAlarm {
 
         previousReached = reached;
 
-        if (!enteredTriggeredSide) {
+        if (!reached) {
             return;
         }
 
-        if (definition.trigger() == AlarmTrigger.ONETIME && triggerCount > 0) {
+        if (definition.trigger() == AlarmTrigger.ONETIME) {
+            if (!enteredTriggeredSide || triggerCount > 0) {
+                return;
+            }
+
+            trigger(price);
             return;
         }
 
-        triggerCount++;
-        action.trigger(price, definition);
+        if (definition.trigger() == AlarmTrigger.PERSISTENT) {
+            if (enteredTriggeredSide || persistentGracePeriodHasPassed()) {
+                trigger(price);
+            }
+            return;
+        }
+
+        throw new IllegalStateException("Unsupported alarm trigger: " + definition.trigger());
     }
 
     public PriceAlarmDefinition definition() {
@@ -45,9 +58,32 @@ public final class PriceAlarm {
         return triggerCount;
     }
 
+    private boolean persistentGracePeriodHasPassed() {
+        if (lastTriggeredAt == null) {
+            return true;
+        }
+
+        ΩsecondsΩ gracePeriod = definition.triggerGracePeriod();
+
+        if (gracePeriod == 0) {
+            return true;
+        }
+
+        return !Instant.now().isBefore(
+                lastTriggeredAt.plusSeconds(gracePeriod)
+        );
+    }
+
+    private void trigger(OraclePrice price) {
+        triggerCount++;
+        lastTriggeredAt = Instant.now();
+        action.trigger(price, definition);
+    }
+
     private final PriceAlarmDefinition definition;
     private final AlarmAction action;
 
+    private Instant lastTriggeredAt;
     private Boolean previousReached;
     private long triggerCount;
 }
diff --git a/src/main/tjava/com/r35157/jupiterperpsalarm/impl/ref/PriceAlarmDefinition.tjava b/src/main/tjava/com/r35157/jupiterperpsalarm/impl/ref/PriceAlarmDefinition.tjava
index eca2033..e7085a6 100644
--- a/src/main/tjava/com/r35157/jupiterperpsalarm/impl/ref/PriceAlarmDefinition.tjava
+++ b/src/main/tjava/com/r35157/jupiterperpsalarm/impl/ref/PriceAlarmDefinition.tjava
@@ -11,7 +11,7 @@ public record PriceAlarmDefinition(
         PriceDirection direction,
         BigDecimal target,
         AlarmTrigger trigger,
-        ΩsecondsΩ triggerGracePeriodSeconds,
+        ΩsecondsΩ triggerGracePeriod,
         AlarmSeverity severity,
         String note
 ) {
@@ -26,9 +26,9 @@ public record PriceAlarmDefinition(
             throw new IllegalArgumentException("Target price cannot be negative (was: " + target.signum() + ")!");
         }
 
-        if (triggerGracePeriodSeconds < 0) {
+        if (triggerGracePeriod < 0) {
             throw new IllegalArgumentException(
-                    "Trigger grace period cannot be negative: " + triggerGracePeriodSeconds
+                    "Trigger grace period cannot be negative: " + triggerGracePeriod
             );
         }
     }