Last I checked there's no SLA whatsoever until the top-tier "self-serve" plan, and that SLA's not an impressive one.
I've also heard (admittedly, from their competitors, but they turned out to be right about other things) that if your usage gets too crazy they'll encourage you to start paying.
And nb. that 100% of the "self-serve" plans (not the "call us" pricing) specify web traffic, like from a browser. If you're using it for e.g. delivering data to apps you might get away with it, but it's not technically permitted. Again, last I checked.
I've also heard (admittedly, from their competitors, but they turned out to be right about other things) that if your usage gets too crazy they'll encourage you to start paying.
And nb. that 100% of the "self-serve" plans (not the "call us" pricing) specify web traffic, like from a browser. If you're using it for e.g. delivering data to apps you might get away with it, but it's not technically permitted. Again, last I checked.