diff --git a/actpool/actpool.go b/actpool/actpool.go
index 1310359ddb..2eda0bd5df 100644
--- a/actpool/actpool.go
+++ b/actpool/actpool.go
@@ -212,7 +212,8 @@ func (ap *actPool) Add(act action.SealedEnvelope) error {
 	// Reject action if the gas price is lower than the threshold
 	if act.GasPrice().Cmp(ap.cfg.MinGasPrice()) < 0 {
 		actpoolMtc.WithLabelValues("gasPriceLower").Inc()
-		return errors.Errorf(
+		return errors.Wrapf(
+			action.ErrGasPrice,
 			"reject the action %x whose gas price %s is lower than minimal gas price threshold",
 			hash,
 			act.GasPrice(),
diff --git a/api/api.go b/api/api.go
index 29bc5fad3f..5c8f77ae9f 100644
--- a/api/api.go
+++ b/api/api.go
@@ -25,6 +25,7 @@ import (
 	"github.com/iotexproject/iotex-proto/golang/iotextypes"
 	"github.com/pkg/errors"
 	"go.uber.org/zap"
+	"google.golang.org/genproto/googleapis/rpc/errdetails"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/reflection"
@@ -327,7 +328,35 @@ func (api *Server) SendAction(ctx context.Context, in *iotexapi.SendActionReques
 	// Add to local actpool
 	if err = api.ap.Add(selp); err != nil {
 		log.L().Debug(err.Error())
-		return nil, status.Error(codes.Internal, err.Error())
+		var desc string
+		switch errors.Cause(err) {
+		case action.ErrBalance:
+			desc = "Invalid balance"
+		case action.ErrInsufficientBalanceForGas:
+			desc = "Insufficient balance for gas"
+		case action.ErrNonce:
+			desc = "Invalid nonce"
+		case action.ErrAddress:
+			desc = "Blacklisted address"
+		case action.ErrActPool:
+			desc = "Invalid actpool"
+		case action.ErrGasPrice:
+			desc = "Invalid gas price"
+		default:
+			desc = "Unknown"
+		}
+		st := status.New(codes.Internal, err.Error())
+		v := &errdetails.BadRequest_FieldViolation{
+			Field:       "Action rejected",
+			Description: desc,
+		}
+		br := &errdetails.BadRequest{}
+		br.FieldViolations = append(br.FieldViolations, v)
+		st, err := st.WithDetails(br)
+		if err != nil {
+			log.S().Panicf("Unexpected error attaching metadata: %v", err)
+		}
+		return nil, st.Err()
 	}
 	// If there is no error putting into local actpool,
 	// Broadcast it to the network
diff --git a/go.mod b/go.mod
index e97fa0f807..70d08cdc66 100644
--- a/go.mod
+++ b/go.mod
@@ -11,7 +11,7 @@ require (
 	github.com/gogo/protobuf v1.2.1
 	github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef
 	github.com/golang/mock v1.3.1
-	github.com/golang/protobuf v1.3.1
+	github.com/golang/protobuf v1.3.2
 	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0
 	github.com/iotexproject/go-fsm v1.0.0
 	github.com/iotexproject/go-p2p v0.2.10
@@ -45,6 +45,7 @@ require (
 	golang.org/x/sync v0.0.0-20190423024810-112230192c58
 	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 // indirect
 	golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7 // indirect
+	google.golang.org/genproto v0.0.0-20191028173616-919d9bdd9fe6
 	google.golang.org/grpc v1.21.0
 	gopkg.in/urfave/cli.v1 v1.20.0 // indirect
 	gopkg.in/yaml.v2 v2.2.2
diff --git a/go.sum b/go.sum
index 40faf3f7d4..97cbbe0e78 100644
--- a/go.sum
+++ b/go.sum
@@ -102,6 +102,8 @@ github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5y
 github.com/golang/protobuf v1.3.0/go.mod h1:Qd/q+1AKNOZr9uGQzbzCmRO6sUih6GTPZv6a1/R87v0=
 github.com/golang/protobuf v1.3.1 h1:YF8+flBXS5eO826T4nzqPrxfhQThhXl0YzfuUPu4SBg=
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.2 h1:6nsPYzhq5kReh6QImI3k5qWzO4PEbvbIW2cwSfR/6xs=
+github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/golang/snappy v0.0.1 h1:Qgr9rKW7uDUkrbSmQeiDsGa8SjGyCOGtuasMWwvp2P4=
 github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
@@ -561,6 +563,8 @@ google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRn
 google.golang.org/genproto v0.0.0-20190502173448-54afdca5d873/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
 google.golang.org/genproto v0.0.0-20190530194941-fb225487d101 h1:wuGevabY6r+ivPNagjUXGGxF+GqgMd+dBhjsxW4q9u4=
 google.golang.org/genproto v0.0.0-20190530194941-fb225487d101/go.mod h1:z3L6/3dTEVtUr6QSP8miRzeRqwQOioJ9I66odjN4I7s=
+google.golang.org/genproto v0.0.0-20191028173616-919d9bdd9fe6 h1:UXl+Zk3jqqcbEVV7ace5lrt4YdA4tXiz3f/KbmD29Vo=
+google.golang.org/genproto v0.0.0-20191028173616-919d9bdd9fe6/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
 google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=