@marekd , Here is my code

var data = {
"lat": 49.809,
"lon": 16.787,
"model": "gfs",
"parameters": ["wind", "dewpoint", "rh", "pressure"],
"levels": ["surface", "800h", "300h"],
"key": "API KEY"
};
$.ajax({
method: "POST",
contentType: "application/json",
url: "https://api.windy.com/api/point-forecast/v2",
dataType: 'json',
data: data
})
.done(function(msg) {
// console.log(msg);
});

It returns
We are sorry, but something broke.