I get an error in the API ”Rate limit exceeded"

When I get records with the API, may get an error saying “Rate limit exceeded”.
The same error occurred a few days ago. It became available after a few hours.
Is there a limit to the number of API that can be used and the number of records that can be retrieved?

The GET error no longer appears, but when I execute POST or DEL, the following error occurs.
Is there a time zone that is not available for system maintenance?

            <meta name="viewport" content="width=device-width, initial-scale=1">
            <meta charset="utf-8">
            <title>Application Error</title>
            <style media="screen">
              html,body,iframe {
                    margin: 0;
                    padding: 0;
              html,body {
                    height: 100%;
                    overflow: hidden;
              iframe {
                    width: 100%;
                    height: 100%;
                    border: 0;
            <iframe src="//www.herokucdn.com/error-pages/application-error.html"></iframe>

If you search on “rate Limit” in the forum you will find that it is undocumented and thus likely variable for the Adalo API.
I have seen some unverified comments to the effect that it is about 3 a sec. But there is no definitive answer

thank you for your answer.
As you say, I am in trouble because I do not know the specifications because there is no document.