diff --git a/pkg/httpclient/http.go b/pkg/httpclient/http.go
index 6be8743..42f4d11 100644
--- a/pkg/httpclient/http.go
+++ b/pkg/httpclient/http.go
@@ -7,8 +7,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
-
-	"github.com/KyberNetwork/tradinglib/pkg/sb"
+	"net/url"
 )
 
 func DoHTTPRequest(client *http.Client, req *http.Request, out interface{}, options ...Option) (*http.Response, error) {
@@ -47,11 +46,25 @@ func NewRequest(method, baseURL, path string, query Query, body io.Reader) (*htt
 func NewRequestWithContext(
 	ctx context.Context, method, baseURL, path string, query Query, body io.Reader,
 ) (*http.Request, error) {
-	url := baseURL + path
+	u, err := url.Parse(baseURL)
+	if err != nil {
+		return nil, fmt.Errorf("parse url: %w", err)
+	}
+
+	if path != "" {
+		u = u.JoinPath(path)
+	}
 	if query != nil {
-		url = sb.Concat(url, "?", query.String())
+		existingQuery := u.Query()
+		for key, values := range existingQuery {
+			for _, value := range values {
+				query.AddString(key, value)
+			}
+		}
+		u.RawQuery = query.String()
 	}
-	return http.NewRequestWithContext(ctx, method, url, body)
+
+	return http.NewRequestWithContext(ctx, method, u.String(), body)
 }
 
 func NewGet(baseURL, path string, query Query) (*http.Request, error) {
diff --git a/pkg/httpclient/query.go b/pkg/httpclient/query.go
index 0429c46..d5000a1 100644
--- a/pkg/httpclient/query.go
+++ b/pkg/httpclient/query.go
@@ -37,6 +37,11 @@ func (q Query) SetString(key, value string) Query {
 	return q
 }
 
+func (q Query) AddString(key, value string) Query {
+	q.url().Add(key, value)
+	return q
+}
+
 func stringsContains(ss []string, token string) bool {
 	for _, s := range ss {
 		if s == token {