As admin, enable "Mobile services": Site administration ► Mobile app ► Mobile settings Create a new course Create a new quiz activity in the course setting the "Grade to pass" to for example: 5.50 Create a Token in the mobile app service for one user enrolled in the course where you created the quiz as student Click on Site administration ► Plugins ► Web services ► Manage tokens Open the console an execute this new curl request, replacing wstoken with the token you just created and the site url with yours. Replace also the QUIZID, with the id of the quiz you created (the instance id, not the module id) curl 'http://YOUR_SITE/webservice/rest/server.php?moodlewsrestformat=json' --data 'quizid=QUIZID&moodlewssettingfilter=true&moodlewssettingfileurl=true&wsfunction=mod_quiz_get_user_best_grade&wstoken=WS_TOKEN' Confirm that: In the curl request response you see a "gradetopass" field set to the grade you set when creating the quiz Now, go back to the quiz settings and set the "Grade to pass" to 0.0 Execute again the previous curl request and confirm that: In the curl request response you don't see a "gradetopass" field at all