diff --git a/README.md b/README.md
index e680cedc80..c5c0ba5029 100644
--- a/README.md
+++ b/README.md
@@ -1128,7 +1128,7 @@ $ scw inspect myserver | jq '.[0].public_ip.address'
 #### Features
 
 * `scw info` now prints user/organization info from the API ([#142](https://github.com/scaleway/scaleway-cli/issues/130)
-*
+* Added helpers to manipulate new `user_data` API ([#150](https://github.com/scaleway/scaleway-cli/issues/150))
 
 #### Fixes
 
diff --git a/pkg/api/api.go b/pkg/api/api.go
index d1838e306c..7083c085ec 100644
--- a/pkg/api/api.go
+++ b/pkg/api/api.go
@@ -12,6 +12,7 @@ import (
 	"crypto/tls"
 	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"net/http"
 	"net/url"
 	"os"
@@ -1322,6 +1323,98 @@ func (s *ScalewayAPI) GetBootscript(bootscriptID string) (*ScalewayBootscript, e
 	return &oneBootscript.Bootscript, nil
 }
 
+type ScalewayUserdatas struct {
+	UserData []string `json:"user_data"`
+}
+
+// GetUserdatas gets list of userdata for a server
+func (s *ScalewayAPI) GetUserdatas(serverID string) (*ScalewayUserdatas, error) {
+	resp, err := s.GetResponse("servers/" + serverID + "/user_data")
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	var userdatas ScalewayUserdatas
+	decoder := json.NewDecoder(resp.Body)
+	err = decoder.Decode(&userdatas)
+	if err != nil {
+		return nil, err
+	}
+	return &userdatas, nil
+}
+
+type ScalewayUserdata []byte
+
+func (s *ScalewayUserdata) String() string {
+	return string(*s)
+}
+
+// GetUserdata gets a specific userdata for a server
+func (s *ScalewayAPI) GetUserdata(serverID string, key string) (*ScalewayUserdata, error) {
+	var data ScalewayUserdata
+	var err error
+	resp, err := s.GetResponse("servers/" + serverID + "/user_data/" + key)
+	if err != nil {
+		return nil, err
+	}
+	if resp.StatusCode != 200 {
+		return nil, fmt.Errorf("no such user_data %q (%d)", key, resp.StatusCode)
+	}
+
+	defer resp.Body.Close()
+	data, err = ioutil.ReadAll(resp.Body)
+	return &data, err
+}
+
+// PatchUserdata sets a user data
+func (s *ScalewayAPI) PatchUserdata(serverID string, key string, value []byte) error {
+	resource := fmt.Sprintf("servers/%s/user_data/%s", serverID, key)
+	uri := fmt.Sprintf("%s/%s", strings.TrimRight(s.APIUrl, "/"), resource)
+	payload := new(bytes.Buffer)
+	payload.Write(value)
+
+	req, err := http.NewRequest("PATCH", uri, payload)
+	if err != nil {
+		return err
+	}
+
+	req.Header.Set("X-Auth-Token", s.Token)
+	req.Header.Set("Content-Type", "text/plain")
+
+	curl, err := http2curl.GetCurlCommand(req)
+	if os.Getenv("SCW_SENSITIVE") != "1" {
+		log.Debug(s.HideAPICredentials(curl.String()))
+	} else {
+		log.Debug(curl.String())
+	}
+
+	resp, err := s.client.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == 204 {
+		return nil
+	}
+
+	return fmt.Errorf("cannot set user_data (%d)", resp.StatusCode)
+}
+
+// DeleteUserdata deletes a server user_data
+func (s *ScalewayAPI) DeleteUserdata(serverID string, key string) error {
+	resp, err := s.DeleteResponse(fmt.Sprintf("servers/%s/user_data/%s", serverID, key))
+	if err != nil {
+		return err
+	}
+
+	// Succeed POST code
+	if resp.StatusCode == 204 {
+		return nil
+	}
+	return fmt.Errorf("cannot delete user_data (%d)", resp.StatusCode)
+}
+
 // GetTasks get the list of tasks from the ScalewayAPI
 func (s *ScalewayAPI) GetTasks() (*[]ScalewayTask, error) {
 	query := url.Values{}
diff --git a/pkg/cli/x_userdata.go b/pkg/cli/x_userdata.go
index 24bcc9c505..8abaa7dcf5 100644
--- a/pkg/cli/x_userdata.go
+++ b/pkg/cli/x_userdata.go
@@ -4,7 +4,10 @@
 
 package cli
 
-import "fmt"
+import (
+	"fmt"
+	"strings"
+)
 
 var cmdUserdata = &Command{
 	Exec:        runUserdata,
@@ -35,7 +38,48 @@ func runUserdata(cmd *Command, args []string) error {
 		return cmd.PrintShortUsage()
 	}
 
-	fmt.Println("Not implemented")
+	ctx := cmd.GetContext(args)
+	serverID := ctx.API.GetServerID(args[0])
+
+	switch len(args) {
+	case 1:
+		// List userdata
+		res, err := ctx.API.GetUserdatas(serverID)
+		if err != nil {
+			return err
+		}
+		for _, key := range res.UserData {
+			fmt.Fprintln(ctx.Stdout, key)
+		}
+	default:
+		parts := strings.Split(args[1], "=")
+		key := parts[0]
+		switch len(parts) {
+		case 1:
+			// Get userdatas
+			res, err := ctx.API.GetUserdata(serverID, key)
+			if err != nil {
+				return err
+			}
+			fmt.Fprintf(ctx.Stdout, "%s\n", res.String())
+		default:
+			value := parts[1]
+			if value != "" {
+				// Set userdata
+				err := ctx.API.PatchUserdata(serverID, key, []byte(value))
+				if err != nil {
+					return err
+				}
+				fmt.Fprintln(ctx.Stdout, key)
+			} else {
+				// Delete userdata
+				err := ctx.API.DeleteUserdata(serverID, key)
+				if err != nil {
+					return err
+				}
+			}
+		}
+	}
 
 	return nil
 }