Web service free tier credit card

I want to use a free tier web service as a part of my bachelor thesis project, however, when I attempt to create one, even on the free tier, I am required to provide my credit card details. I do not want to incur any accidental charges on my card and I would rather have the web service suspended if I exceed the free tier limits. Is this possible?

We may prompt for card details for verification purposes - without entering a card you would be blocked from creating a service here.

The key thing to keep an eye on is your unbilled charges in the billing section.

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