diff --git a/go.mod b/go.mod
index 28db7f5..87527af 100644
--- a/go.mod
+++ b/go.mod
@@ -7,7 +7,7 @@ toolchain go1.22.3
 require (
 	cloud.google.com/go/secretmanager v1.14.2
 	github.com/Layr-Labs/bn254-keystore-go v0.0.0-20250107020618-26bd412fae87
-	github.com/Layr-Labs/cerberus-api v0.0.2-0.20250107174124-05df6050f723
+	github.com/Layr-Labs/cerberus-api v0.0.2-0.20250108174619-d5e1eb03fbd5
 	github.com/aws/aws-sdk-go-v2 v1.32.5
 	github.com/aws/aws-sdk-go-v2/config v1.28.5
 	github.com/aws/aws-sdk-go-v2/credentials v1.17.46
diff --git a/go.sum b/go.sum
index 0dd9863..33356a2 100644
--- a/go.sum
+++ b/go.sum
@@ -20,8 +20,8 @@ github.com/Azure/go-ansiterm v0.0.0-20230124172434-306776ec8161/go.mod h1:xomTg6
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/Layr-Labs/bn254-keystore-go v0.0.0-20250107020618-26bd412fae87 h1:EkaBNT0o8RTgtFeYSKaoNHNbnCVxrcsAyRpUeN29hiQ=
 github.com/Layr-Labs/bn254-keystore-go v0.0.0-20250107020618-26bd412fae87/go.mod h1:7J8hptSX8cFq7KmVb+rEO5aEifj7E44c3i0afIyr4WA=
-github.com/Layr-Labs/cerberus-api v0.0.2-0.20250107174124-05df6050f723 h1:f6gJS/egys133nGcOGKduiPHq9hyK9KRiEB9fARB5t0=
-github.com/Layr-Labs/cerberus-api v0.0.2-0.20250107174124-05df6050f723/go.mod h1:Lm4fhzy0S3P7GjerzuseGaBFVczsIKmEhIjcT52Hluo=
+github.com/Layr-Labs/cerberus-api v0.0.2-0.20250108174619-d5e1eb03fbd5 h1:s24M6HYObEuV9OSY36jUM09kp5fOhuz/g1ev2qWDPzU=
+github.com/Layr-Labs/cerberus-api v0.0.2-0.20250108174619-d5e1eb03fbd5/go.mod h1:Lm4fhzy0S3P7GjerzuseGaBFVczsIKmEhIjcT52Hluo=
 github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
 github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
 github.com/aws/aws-sdk-go-v2 v1.32.5 h1:U8vdWJuY7ruAkzaOdD7guwJjD06YSKmnKCJs7s3IkIo=
diff --git a/internal/services/signing/signing.go b/internal/services/signing/signing.go
index c55fcea..d2a970b 100644
--- a/internal/services/signing/signing.go
+++ b/internal/services/signing/signing.go
@@ -73,3 +73,30 @@ func (s *Service) SignGeneric(
 	s.logger.Info(fmt.Sprintf("Signed a message successfully using %s", pubKeyHex))
 	return &v1.SignGenericResponse{Signature: sig.Serialize()}, nil
 }
+
+func (s *Service) SignG1(
+	ctx context.Context,
+	req *v1.SignG1Request,
+) (*v1.SignG1Response, error) {
+	// Take the public key and data from the request
+	pubKeyHex := common.Trim0x(req.GetPublicKeyG1())
+	password := req.GetPassword()
+
+	if _, ok := s.keyCache[pubKeyHex]; !ok {
+		s.logger.Info(fmt.Sprintf("In memory cache miss. Retrieving key for %s", pubKeyHex))
+		blsKey, err := s.store.RetrieveKey(ctx, pubKeyHex, password)
+		if err != nil {
+			s.logger.Error(fmt.Sprintf("Failed to retrieve key: %v", err))
+			return nil, status.Error(codes.Internal, err.Error())
+		}
+		s.keyCache[pubKeyHex] = blsKey
+	}
+	blsKey := s.keyCache[pubKeyHex]
+
+	g1Bytes := req.GetData()
+	g1Point := new(crypto.G1Point)
+	g1Point = g1Point.Deserialize(g1Bytes)
+
+	sig := blsKey.SignHashedToCurveMessage(g1Point.G1Affine)
+	return &v1.SignG1Response{Signature: sig.Serialize()}, nil
+}
diff --git a/internal/services/signing/signing_test.go b/internal/services/signing/signing_test.go
index b171c15..378a4c7 100644
--- a/internal/services/signing/signing_test.go
+++ b/internal/services/signing/signing_test.go
@@ -40,3 +40,29 @@ func TestSigning(t *testing.T) {
 	assert.NoError(t, err)
 	assert.Equal(t, expectedSig, hex.EncodeToString(resp.Signature))
 }
+
+func TestSigningG1(t *testing.T) {
+	// private key: 0x040ad69253b921aca71dd714cccc3095576fbe1a21f86c9b10cb5b119b1c6899
+	pubKeyHex := "a3111a2232584734d526d62cbb7c9a0d4ce1984a92b7ecb85bde8878fea5d1b0"
+	password := "p@$$w0rd"
+	expectedSig := "24a87f9eab63a40c62831d2e9598e698f8819b15093c268b89c1a521f7d986650000000000000000000000000000000000000000000000000000000000000000"
+	data := []byte("somedata")
+	var bytes [64]byte
+	copy(bytes[:], data)
+
+	config := &configuration.Configuration{
+		KeystoreDir: "testdata/keystore",
+	}
+	logger := testutils.GetTestLogger()
+	store := filesystem.NewStore(config.KeystoreDir, logger)
+	m := metrics.NewNoopRPCMetrics()
+	signingService := NewService(config, store, logger, m)
+
+	resp, err := signingService.SignG1(context.Background(), &v1.SignG1Request{
+		PublicKeyG1: pubKeyHex,
+		Data:        bytes[:],
+		Password:    password,
+	})
+	assert.NoError(t, err)
+	assert.Equal(t, expectedSig, hex.EncodeToString(resp.Signature))
+}