You can confirm the allowed usage amounts with something like ccusage or tokscale

Yes, but I still don't know where the truth is.... The Mistral dashboard shows a drawn down on €255 worth of "credit" when you have a Pro subscription, which costs €18.44. There's no way I'm going to use the pay-as-you-go API if it means I'd be burning €500 in the next six days, as I just ostensibly have in the last 6.

I appreciate I can set a monthly spending limit for the pay-as-you-go API, but I'm just not willing to find out how far €100 will go, when I know it will go further elsewhere.

I just wish they had that €100 subscription tier, for the equivalent of €1k pay-as-you-go use.