HiddenCanary

I've seen tech contractors asking the client to pay for common tools that they may need to do their job. This seems odd to me, given that in construction, a client would expect the contractors to bring their own construction tools.

I'm looking for a good way to Mock APIs for a sideproject, so far I haven't found any solution that has blown me away and I'm wondering If I'm missing anything.

I'm curious what people recommend for the best way to Mock APIs?