Call Webservices from HTML, Not able to receive the API response

Your API method type is POST method, so your ajax type dhould be POST.

$(document).ready(function() {
    var url = 'YourApiUrl';
    var payload = {
        values: '100000003'
    };
    $.ajax({
        url: url,
        type: 'POST',
        contentType: 'application/json',
        data: JSON.stringify(payload),
        success: function(response) {
            // Process the response data
            console.log(response);
        },
        error: function(xhr, status, error) {
            // Handle error
            console.log(error);
        }
    });
});

@Amit Mohanty it is not reaching to API

Try this:

$(document).ready(function() {
    var url = 'YourWebService.asmx/YourWebServiceMethod';
    var values = '100000003';
    var queryString = '?values=' + encodeURIComponent(param1);

    $.ajax({
        url: url + queryString,
        type: 'GET',
        contentType: 'application/json',
        success: function(response) {
            // Process the response data
            console.log(response);
        },
        error: function(xhr, status, error) {
            // Handle error
            console.log(error);
        }
    });
});