var token = $(‘input[name="__RequestVerificationToken"]‘).val();
var headers = {};
headers[‘__RequestVerificationToken‘] = token;
$.ajax({
    type: ‘POST‘,
    url: ‘/MyTestMethod‘,
    contentType: ‘application/json; charset=utf-8‘,
    headers: headers,
    data: JSON.stringify({
        Test: ‘test‘
    }),
    dataType: "json",
    success: function () {},
    error: function (xhr) {}
});

[AttributeUsage(AttributeTargets.Method | AttributeTargets.Class, AllowMultiple = false, Inherited = true)]
public class ValidateJsonAntiForgeryTokenAttribute : FilterAttribute, IAuthorizationFilter
{
    public void OnAuthorization(AuthorizationContext filterContext)
    {
        if (filterContext == null)
        {
            throw new ArgumentNullException("filterContext");
        }

        var httpContext = filterContext.HttpContext;
        var cookie = httpContext.Request.Cookies[AntiForgeryConfig.CookieName];
        AntiForgery.Validate(cookie != null ? cookie.Value : null, httpContext.Request.Headers["__RequestVerificationToken"]);
    }
}


[HttpPost]
[AllowAnonymous]
[ValidateJsonAntiForgeryToken]
public async Task<JsonResult> MyTestMethod(string Test)
{
    return Json(true);
}