[huanwin]

https://www.nearlyfreespeech.net/ fulfills most of your requirements, it seems.

SFTP access, file upload, very cheap pay-as-you-go (traffic spikes will hit the $0 floor and stop incurring charges), email/password login.

They do not provide a static IP but do attempt to cover the seemingly most-common case where clients request it: "The most common reason people request a static IP address is to point external DNS at a site hosted with us. As part of our hosting service, we provide our own special DNS records for each site that you can link to external DNS using the CNAME capability that work even better than static IPs. These records preserve full fault tolerance and load balancing."

[SamWhited]

I'll check it out; thanks! I'm slightly worried about their whole "libertarian Terms & Conditions of Service" as they put it. It sounds like this might just be an exuse to encourage hate speech and I'd hate for my sites to get lumped into the IP reputation (not that IP reputation makes sense, but it's a thing that corporate firewalls and the like do) of sites like that if they don't moderate anything that's not technically illegal in the US. Unsure if this is the case or not though, just reading through their terms.

EDIT: read up on this and it sounds like they definitely host and fight for doxing sites and crap which is technically legal, but still not okay. Even in business you should have some basic decency so I don't think I'll be using them.

[huanwin]

In that case, I'd second the other recommendation of Neocities, which is what I use now.