diff --git a/event.go b/event.go
index 156ca0d..cce165e 100644
--- a/event.go
+++ b/event.go
@@ -82,24 +82,3 @@ func (evt *Event) Serialize() []byte {
 
 	return dst
 }
-
-// IsRegular checks if the given kind is in Regular range.
-func (evt *Event) IsRegular() bool {
-	return evt.Kind < 10000 && evt.Kind != 0 && evt.Kind != 3
-}
-
-// IsReplaceable checks if the given kind is in Replaceable range.
-func (evt *Event) IsReplaceable() bool {
-	return evt.Kind == 0 || evt.Kind == 3 ||
-		(10000 <= evt.Kind && evt.Kind < 20000)
-}
-
-// IsEphemeral checks if the given kind is in Ephemeral range.
-func (evt *Event) IsEphemeral() bool {
-	return 20000 <= evt.Kind && evt.Kind < 30000
-}
-
-// IsAddressable checks if the given kind is in Addressable range.
-func (evt *Event) IsAddressable() bool {
-	return 30000 <= evt.Kind && evt.Kind < 40000
-}
diff --git a/event_test.go b/event_test.go
index c61ff36..0cde38b 100644
--- a/event_test.go
+++ b/event_test.go
@@ -116,15 +116,3 @@ func BenchmarkIDCheck(b *testing.B) {
 		}
 	})
 }
-
-func EventKindTest(t *testing.T) {
-	require.True(t, (&Event{Kind: 1}).IsRegular())
-	require.True(t, (&Event{Kind: 9}).IsRegular())
-	require.True(t, (&Event{Kind: 1111}).IsRegular())
-	require.True(t, (&Event{Kind: 0}).IsReplaceable())
-	require.True(t, (&Event{Kind: 3}).IsReplaceable())
-	require.True(t, (&Event{Kind: 10002}).IsReplaceable())
-	require.True(t, (&Event{Kind: 10050}).IsReplaceable())
-	require.True(t, (&Event{Kind: 30023}).IsAddressable())
-	require.True(t, (&Event{Kind: 39000}).IsAddressable())
-}
diff --git a/kinds.go b/kinds.go
index 73f614d..177b2fd 100644
--- a/kinds.go
+++ b/kinds.go
@@ -132,3 +132,19 @@ const (
 	KindSimpleGroupAdmins           int = 39001
 	KindSimpleGroupMembers          int = 39002
 )
+
+func IsRegularKind(kind int) bool {
+	return kind < 10000 && kind != 0 && kind != 3
+}
+
+func IsReplaceableKind(kind int) bool {
+	return kind == 0 || kind == 3 || (10000 <= kind && kind < 20000)
+}
+
+func IsEphemeralKind(kind int) bool {
+	return 20000 <= kind && kind < 30000
+}
+
+func IsAddressableKind(kind int) bool {
+	return 30000 <= kind && kind < 40000
+}
diff --git a/kinds_test.go b/kinds_test.go
new file mode 100644
index 0000000..e834237
--- /dev/null
+++ b/kinds_test.go
@@ -0,0 +1,19 @@
+package nostr
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func KindKindTest(t *testing.T) {
+	require.True(t, IsRegularKind(1))
+	require.True(t, IsRegularKind(9))
+	require.True(t, IsRegularKind(1111))
+	require.True(t, IsReplaceableKind(0))
+	require.True(t, IsReplaceableKind(3))
+	require.True(t, IsReplaceableKind(10002))
+	require.True(t, IsReplaceableKind(10050))
+	require.True(t, IsAddressableKind(30023))
+	require.True(t, IsAddressableKind(39000))
+}