diff --git a/chain_capabilities/solana/trigger/trigger.go b/chain_capabilities/solana/trigger/trigger.go
index 60f11ff2c..8e5147ae6 100644
--- a/chain_capabilities/solana/trigger/trigger.go
+++ b/chain_capabilities/solana/trigger/trigger.go
@@ -36,6 +36,8 @@ const (
 	SuffixLogTriggerFilterID = "-solana-log-trigger"
 	defaultQueryLimit        = 1000
 	defaultMaxPagesPerPoll   = 5
+	maxSubkeysPerTrigger     = 4
+	maxComparersPerSubkey    = 10
 )
 
 func publicKeyFromBytes(fieldName string, raw []byte) (solana.PublicKey, error) {
@@ -64,11 +66,16 @@ func validateFilterConfig(config *solanacappb.FilterLogTriggerRequest) error {
 		return fmt.Errorf("event idl json cannot be empty")
 	}
 
+	if len(config.Subkeys) > maxSubkeysPerTrigger {
+		return fmt.Errorf("too many subkeys: maximum supported is %d, got %d", maxSubkeysPerTrigger, len(config.Subkeys))
+	}
+
 	if config.CpiFilterConfig != nil {
 		if _, err := publicKeyFromBytes("cpi filter destination address", config.CpiFilterConfig.DestAddress); err != nil {
 			return err
 		}
 	}
+
 	return validateSubkeyComparers(config.Subkeys)
 }
 
@@ -77,6 +84,9 @@ func validateSubkeyComparers(subkeys []*solanacappb.SubkeyConfig) error {
 		if subkey == nil || len(subkey.Comparers) < 2 {
 			continue
 		}
+		if len(subkey.Comparers) > maxComparersPerSubkey {
+			return fmt.Errorf("subkey %d has too many comparers: %d limit: %d", i, len(subkey.Comparers), maxComparersPerSubkey)
+		}
 
 		eqValues := make(map[string]struct{})
 		for _, comp := range subkey.Comparers {
diff --git a/chain_capabilities/solana/trigger/trigger_test.go b/chain_capabilities/solana/trigger/trigger_test.go
index da79c7735..420c3fbb9 100644
--- a/chain_capabilities/solana/trigger/trigger_test.go
+++ b/chain_capabilities/solana/trigger/trigger_test.go
@@ -197,6 +197,24 @@ func TestRegisterLogTrigger(t *testing.T) {
 		mockSolana.AssertExpectations(t)
 	})
 
+	t.Run("too many subkeys", func(t *testing.T) {
+		service, mockSolana := setupTest(t)
+		request := createTestRequest()
+		request.Subkeys = []*solanacappb.SubkeyConfig{
+			{Path: []string{"f1"}},
+			{Path: []string{"f2"}},
+			{Path: []string{"f3"}},
+			{Path: []string{"f4"}},
+			{Path: []string{"f5"}},
+		}
+
+		_, err := service.RegisterLogTrigger(ctx, testTriggerID, testRequestMetadata(), request)
+
+		require.NotNil(t, err)
+		assert.Contains(t, err.Error(), "maximum supported is 4")
+		mockSolana.AssertExpectations(t)
+	})
+
 	t.Run("register log tracking fails", func(t *testing.T) {
 		service, mockSolana := setupTest(t)
 		request := createTestRequest()