Happy 10,000th Day to you :-D Yes, moto and its friend localstack are just fantastic for being able to play with AWS without spending money, or to reproduce kabooms that only happen once a month with the real API

I believe moto has an "embedded" version such that one need not even have in listen on a network port, but I find it much, much less mental gymnastics to just supersede the "endpoint" address in the actual AWS SDKs to point to 127.0.0.1:4566 and off to the races. The AWS SDKs are even so friendly as to not mandate TLS or have allowlists of endpoint addresses, unlike their misguided Azure colleagues