diff --git a/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/AuthCmd.kt b/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/AuthCmd.kt
index bba274c5a..933236ea3 100644
--- a/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/AuthCmd.kt
+++ b/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/AuthCmd.kt
@@ -27,6 +27,8 @@ class AuthCmd(
 ) : Command {
     override fun label(): String = LABEL
 
+    override fun isValid() = true
+
     companion object {
         const val LABEL = "AUTH"
     }
diff --git a/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/CloseCmd.kt b/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/CloseCmd.kt
index ab57f7a72..350c40d5d 100644
--- a/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/CloseCmd.kt
+++ b/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/CloseCmd.kt
@@ -25,6 +25,8 @@ class CloseCmd(
 ) : Command {
     override fun label(): String = LABEL
 
+    override fun isValid() = subId.isNotEmpty()
+
     companion object {
         const val LABEL = "CLOSE"
     }
diff --git a/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/Command.kt b/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/Command.kt
index 3b04d4c50..16df75e58 100644
--- a/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/Command.kt
+++ b/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/Command.kt
@@ -24,4 +24,6 @@ import com.vitorpamplona.quartz.nip01Core.core.OptimizedSerializable
 
 interface Command : OptimizedSerializable {
     fun label(): String
+
+    fun isValid(): Boolean
 }
diff --git a/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/CountCmd.kt b/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/CountCmd.kt
index e858fa439..e1a04b381 100644
--- a/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/CountCmd.kt
+++ b/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/CountCmd.kt
@@ -28,6 +28,8 @@ class CountCmd(
 ) : Command {
     override fun label(): String = LABEL
 
+    override fun isValid() = subId.isNotEmpty() && filters.isNotEmpty()
+
     companion object {
         const val LABEL = "COUNT"
     }
diff --git a/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/EventCmd.kt b/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/EventCmd.kt
index 73a28a35c..714c39ee9 100644
--- a/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/EventCmd.kt
+++ b/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/EventCmd.kt
@@ -27,6 +27,8 @@ class EventCmd(
 ) : Command {
     override fun label(): String = LABEL
 
+    override fun isValid() = true
+
     companion object {
         const val LABEL = "EVENT"
     }
diff --git a/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/ReqCmd.kt b/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/ReqCmd.kt
index eaf972de6..1595f8d00 100644
--- a/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/ReqCmd.kt
+++ b/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/ReqCmd.kt
@@ -28,6 +28,8 @@ class ReqCmd(
 ) : Command {
     override fun label(): String = LABEL
 
+    override fun isValid() = subId.isNotEmpty() && filters.isNotEmpty()
+
     companion object {
         const val LABEL = "REQ"
     }