Free account can not call API any more?

Hello all,
I create a new account yesterday, and then create a secret API key. As I checked I have 5$ to use.
I assume that I can call api send a simple question and receive the answers.
But the answers always like this:
You exceeded your current quota, please check your plan and billing details

Does OpenAI change the policy recently? Or did I do something wrong?
Could some one help me on this topic? or confirm that can not use free account anymore?
My simple code java as below:

        String apiKey = "mySecretKey";
        String finalQuestion = "Who are you?";
        String answers = "";
        // Create HttpClient
        HttpClient client = HttpClient.newHttpClient();

        // Prepare the request
        HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create("https://api.openai.com/v1/completions"))
                .header("Content-Type", "application/json")
                .header("Authorization", "Bearer " + apiKey)
                .POST(HttpRequest.BodyPublishers.ofString("{\"model\":\"gpt-3.5-turbo\",\"prompt\":\"" + finalQuestion + "\",\"max_tokens\":150}"))
                .build();

        // Send the request and retrieve the response
        try {
            HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
            System.out.println("Response Code: " + response.statusCode());
            System.out.println("Response Body:\n" + response.body());
            answers = response.body();
        } catch (Exception e) {
            e.printStackTrace();
        }

429 - You exceeded your current quota, please check your plan and billing details Cause: You have run out of credits or hit your maximum monthly spend.
Solution: Buy more credits or learn how to increase your limits.

But I just create account yesterday, and first time call API, issue occurs.
How about my 5$ after register new account?

There’s no $5 free with new accounts anymore. You need to add billing details and buy credits.