diff --git a/token-validator/students.go b/token-validator/students.go
index 386df9a..2eab74a 100644
--- a/token-validator/students.go
+++ b/token-validator/students.go
@@ -5,6 +5,7 @@ import (
 	"crypto/sha512"
 	"encoding/json"
 	"fmt"
+	"log"
 	"strings"
 	"time"
 
@@ -12,7 +13,7 @@ import (
 )
 
 func init() {
-	router.GET("/api/progress/", apiHandler(
+	router.GET("/api/progress", apiHandler(
 		func(httprouter.Params, []byte) (interface{}, error) {
 			if stds, err := getStudents(); err != nil {
 				return nil, err
@@ -25,6 +26,16 @@ func init() {
 						for _, s := range sts {
 							ret[std.Login][fmt.Sprintf("%d", s.Challenge)] = s
 						}
+
+						if pongs, err := std.lastPongs(); err == nil && len(pongs) > 0 {
+							ret[std.Login]["ping"] = UnlockedChallenge{
+								IdStudent: std.Id,
+								Time: pongs[0].Date,
+								Value: pongs[0].State,
+							}
+						} else if err != nil {
+							log.Println(err)
+						}
 					}
 				}
 				return ret, nil
@@ -187,11 +198,11 @@ func updateStudent(current Student, body []byte) (interface{}, error) {
 }
 
 type UnlockedChallenge struct {
-	Id        int64     `json:"id"`
-	IdStudent int64     `json:"id_student"`
-	Challenge int       `json:"challenge"`
-	Time      time.Time `json:"time"`
-	Value     string    `json:"value,omitempty"`
+	Id        int64       `json:"id,omitempty"`
+	IdStudent int64       `json:"id_student"`
+	Challenge int         `json:"challenge,omitempty"`
+	Time      time.Time   `json:"time"`
+	Value     interface{} `json:"value,omitempty"`
 }
 
 func (s Student) getStates() (ucs []UnlockedChallenge, err error) {