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Both. I’d pay per 1K API calls below a certain threshold but the peace of mind that if I get sudden spike (or make a mistake) it’s not going to bankrupt me.

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I'd probably do the same thing. If I'm not using a service a lot I don't want to pay for it or I only want to pay when I use it.

Otherwise for constant usage I'd prefer to be able to know my spending ahead of time.

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