diff --git a/auth.go b/auth.go
index 45aba5d..4bb90b8 100644
--- a/auth.go
+++ b/auth.go
@@ -3,6 +3,7 @@ package uexchange
 import (
 	"encoding/json"
 	"errors"
+	"net/url"
 )
 
 // Auth client
@@ -15,11 +16,12 @@ func (c *Client) Auth(cred Credentials) (*APIAuthResultContainer, error) {
 	}
 
 	c.APICredentials = cred
-	body, err := c.sendRequest(c.getAPIURL("user/login"), "POST", map[string]interface{}{
-		"PublicKey": cred.AccountPublicKey,
-		"password":  cred.Password,
-		"2fa_pin":   cred.TwoFACode,
-	})
+	reqFields := url.Values{}
+	reqFields.Add("PublicKey", cred.AccountPublicKey)
+	reqFields.Add("password", cred.Password)
+	reqFields.Add("2fa_pin", cred.TwoFACode)
+
+	body, err := c.sendRequest(c.getAPIURL("user/login"), "POST", reqFields)
 	if err != nil {
 		return nil, err
 	}
@@ -44,7 +46,7 @@ func (c *Client) Auth(cred Credentials) (*APIAuthResultContainer, error) {
 
 // Logout - close auth session
 func (c *Client) Logout() error {
-	body, err := c.sendRequest(c.getAPIURL("user/logout"), "POST", mapTable{})
+	body, err := c.sendRequest(c.getAPIURL("user/logout"), "POST", url.Values{})
 	if err != nil {
 		return err
 	}
diff --git a/balance.go b/balance.go
index c568d98..1bbc254 100644
--- a/balance.go
+++ b/balance.go
@@ -3,11 +3,12 @@ package uexchange
 import (
 	"encoding/json"
 	"errors"
+	"net/url"
 )
 
 // GetBalance - get balance data for all coins
 func (c *Client) GetBalance() ([]BalanceData, error) {
-	body, err := c.sendRequest(c.getAPIURL("user/balance"), "GET", mapTable{})
+	body, err := c.sendRequest(c.getAPIURL("user/balance"), "GET", url.Values{})
 	if err != nil {
 		return nil, err
 	}
diff --git a/client.go b/client.go
index 03424bc..a304d07 100644
--- a/client.go
+++ b/client.go
@@ -1,11 +1,11 @@
 package uexchange
 
 import (
-	"bytes"
-	"encoding/json"
 	"errors"
 	"io/ioutil"
 	"net/http"
+	"net/url"
+	"strings"
 )
 
 // NewClient - ..
@@ -17,37 +17,57 @@ func (c *Client) getAPIURL(endpoint string) string {
 	return apiHost + ":" + apiPort + "/" + endpoint
 }
 
-func (c *Client) sendRequest(url string, requestType string, data map[string]interface{}) ([]byte, error) {
-	// declare http client
-	httpClient := &http.Client{}
-
-	// encode data fields to json
-	dataBytes, err := json.Marshal(data)
-	if err != nil {
-		return nil, errors.New("failed to encode request data to json: " + err.Error())
-	}
-
-	// declare HTTP Method and Url
+func (c *Client) sendRequest(requestURL string, requestType string, params url.Values) ([]byte, error) {
 	switch requestType {
 	default:
 		return nil, errors.New("invalid request type given: " + requestType)
 	case "POST":
-		break
+		return c.sendPOSTRequest(requestURL, params)
 	case "GET":
-		break
+		return c.sendGETRequest(requestURL, params)
 	}
-	req, err := http.NewRequest(requestType, url, bytes.NewBuffer(dataBytes))
+}
+
+func (c *Client) sendGETRequest(requestURL string, params url.Values) ([]byte, error) {
+	// send request
+	resp, err := http.Get(requestURL + "?" + params.Encode())
 	if err != nil {
-		return nil, errors.New("failed to send " + requestType + " request: " + err.Error())
+		return nil, err
+	}
+
+	// read response
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, errors.New("failed to read request response: " + err.Error())
+	}
+
+	defer resp.Body.Close()
+	return body, nil
+}
+
+func (c *Client) sendPOSTRequest(requestURL string, params url.Values) ([]byte, error) {
+	// declare http client
+	httpClient := &http.Client{}
+
+	// create request
+	req, err := http.NewRequest("POST", requestURL, strings.NewReader(params.Encode()))
+	if err != nil {
+		return nil, errors.New("failed to send POST request: " + err.Error())
 	}
 
 	// set cookie
 	if c.AuthToken != "" {
-		req.Header.Set("Cookie", "auth_token="+c.AuthToken)
+		req.AddCookie(&http.Cookie{
+			Name:  "auth_token",
+			Value: c.AuthToken,
+		})
 	}
 
 	// send request
 	resp, err := httpClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
 
 	// read response
 	body, err := ioutil.ReadAll(resp.Body)
diff --git a/history.go b/history.go
index cffde55..5de1926 100644
--- a/history.go
+++ b/history.go
@@ -3,13 +3,14 @@ package uexchange
 import (
 	"encoding/json"
 	"errors"
+	"net/url"
 )
 
 // GetTradeHistory - get trading history by pairs
 func (c *Client) GetTradeHistory(pairSymbol string) (*TradeHistoryDataContainer, error) {
-	body, err := c.sendRequest(c.getAPIURL("history/trade"), "GET", mapTable{
-		"pair": pairSymbol,
-	})
+	reqFields := url.Values{}
+	reqFields.Add("pair", pairSymbol)
+	body, err := c.sendRequest(c.getAPIURL("history/trade"), "GET", reqFields)
 	if err != nil {
 		return nil, err
 	}
@@ -74,17 +75,16 @@ func (s *GetAccountHistoryService) SetCurrency(newCurrency string) *GetAccountHi
 
 // Do request
 func (s *GetAccountHistoryService) Do() (*OperationsHistoryDataContainer, error) {
-	requestFieldsMap := mapTable{
-		"type": s.RequestType,
-	}
+	requestFieldsMap := url.Values{}
+	requestFieldsMap.Add("type", s.RequestType)
 	if s.FromID != "" {
-		requestFieldsMap["from_id"] = s.FromID
+		requestFieldsMap.Add("from_id", s.FromID)
 	}
 	if s.RecordType != "" {
-		requestFieldsMap["record_type"] = s.RecordType
+		requestFieldsMap.Add("record_type", s.RecordType)
 	}
 	if s.Currency != "" {
-		requestFieldsMap["currency"] = s.Currency
+		requestFieldsMap.Add("currency", s.Currency)
 	}
 
 	body, err := s.ExchangeClient.sendRequest(
diff --git a/orders.go b/orders.go
index fe1f130..bc122bf 100644
--- a/orders.go
+++ b/orders.go
@@ -3,6 +3,7 @@ package uexchange
 import (
 	"encoding/json"
 	"errors"
+	"net/url"
 )
 
 // GetOrdersService - get orders service with optional params
@@ -33,12 +34,12 @@ func (s *GetOrdersService) SetTaskType(taskType string) *GetOrdersService {
 
 // Do request
 func (s *GetOrdersService) Do() (*OrdersDataContainer, error) {
-	requestFieldsMap := mapTable{}
+	requestFieldsMap := url.Values{}
 	if s.OrderType != "" {
-		requestFieldsMap["status"] = s.OrderType
+		requestFieldsMap.Add("status", s.OrderType)
 	}
 	if s.TaskType != "" {
-		requestFieldsMap["task"] = s.TaskType
+		requestFieldsMap.Add("task", s.TaskType)
 	}
 
 	body, err := s.ExchangeClient.sendRequest(
@@ -65,9 +66,9 @@ func (s *GetOrdersService) Do() (*OrdersDataContainer, error) {
 
 // GetOrderHistory - get orders history
 func (c *Client) GetOrderHistory(orderID string) (*OrdersHistoryDataContainer, error) {
-	body, err := c.sendRequest(c.getAPIURL("orders/history"), "POST", mapTable{
-		"order_id": orderID,
-	})
+	reqFields := url.Values{}
+	reqFields.Add("order_id", orderID)
+	body, err := c.sendRequest(c.getAPIURL("orders/history"), "POST", reqFields)
 	if err != nil {
 		return nil, err
 	}
diff --git a/trade.go b/trade.go
index 806ae73..e869a37 100644
--- a/trade.go
+++ b/trade.go
@@ -3,14 +3,17 @@ package uexchange
 import (
 	"encoding/json"
 	"errors"
+	"net/url"
+	"strconv"
 )
 
 func (c *Client) sendTradeTask(orderType string, pairSymbol string, amount, price float64) (int64, error) {
-	body, err := c.sendRequest(c.getAPIURL("market/"+orderType), "POST", mapTable{
-		"pair":   pairSymbol,
-		"amount": amount,
-		"price":  price,
-	})
+	reqFields := url.Values{}
+	reqFields.Add("pair", pairSymbol)
+	reqFields.Add("amount", strconv.FormatFloat(amount, 'f', 8, 64))
+	reqFields.Add("price", strconv.FormatFloat(price, 'f', 8, 64))
+
+	body, err := c.sendRequest(c.getAPIURL("market/"+orderType), "POST", reqFields)
 	if err != nil {
 		return 0, err
 	}
@@ -40,9 +43,9 @@ func (c *Client) Sell(pairSymbol string, amount, price float64) (int64, error) {
 
 // Hold or Unhold order
 func (c *Client) Hold(orderID int64) error {
-	body, err := c.sendRequest(c.getAPIURL("market/hold"), "POST", mapTable{
-		"order_id": orderID,
-	})
+	reqFields := url.Values{}
+	reqFields.Add("order_id", strconv.FormatInt(orderID, 10))
+	body, err := c.sendRequest(c.getAPIURL("market/hold"), "POST", reqFields)
 	if err != nil {
 		return err
 	}
@@ -62,9 +65,9 @@ func (c *Client) Hold(orderID int64) error {
 
 // Cancel the specified order
 func (c *Client) Cancel(orderID int64) error {
-	body, err := c.sendRequest(c.getAPIURL("market/cancel"), "POST", mapTable{
-		"order_id": orderID,
-	})
+	reqFields := url.Values{}
+	reqFields.Add("order_id", strconv.FormatInt(orderID, 10))
+	body, err := c.sendRequest(c.getAPIURL("market/cancel"), "POST", reqFields)
 	if err != nil {
 		return err
 	}
@@ -84,7 +87,7 @@ func (c *Client) Cancel(orderID int64) error {
 
 // GetPairs - get trading pairs list
 func (c *Client) GetPairs() ([]PairsDataContainer, error) {
-	body, err := c.sendRequest(c.getAPIURL("market/pairs"), "GET", mapTable{})
+	body, err := c.sendRequest(c.getAPIURL("market/pairs"), "GET", url.Values{})
 	if err != nil {
 		return nil, err
 	}
@@ -104,9 +107,9 @@ func (c *Client) GetPairs() ([]PairsDataContainer, error) {
 
 // GetOrderBook by trade pair
 func (c *Client) GetOrderBook(pairSymbol string) (*BookValueDataContainer, error) {
-	body, err := c.sendRequest(c.getAPIURL("market/panel"), "POST", mapTable{
-		"pair": pairSymbol,
-	})
+	reqFields := url.Values{}
+	reqFields.Add("pair", pairSymbol)
+	body, err := c.sendRequest(c.getAPIURL("market/panel"), "POST", reqFields)
 	if err != nil {
 		return nil, err
 	}
@@ -126,9 +129,9 @@ func (c *Client) GetOrderBook(pairSymbol string) (*BookValueDataContainer, error
 
 // GetMarketCurrenciesList - get exchange currencies list
 func (c *Client) GetMarketCurrenciesList(pairSymbol string) (*CurrenciesListData, error) {
-	body, err := c.sendRequest(c.getAPIURL("market/curlist"), "GET", mapTable{
-		"pair": pairSymbol,
-	})
+	reqFields := url.Values{}
+	reqFields.Add("pair", pairSymbol)
+	body, err := c.sendRequest(c.getAPIURL("market/curlist"), "GET", reqFields)
 	if err != nil {
 		return nil, err
 	}