Is it possible to retrieve results over HTTP?

I'm probably a unique use case, but I'd like to use this to "fix" the exchange rates portion of Apple's currency converter dashboard widget, and I want it to work even on very old OS's. That means I can't use TLS 1.2, and the root certs are often out of date anyway.

I'm currently using exchangeratesapi.io, which doesn't support HTTP either, but does support TLS 1.0, so it kind of works. However, outdated root certs mean I need to instruct users to manually install exchangeratesapi's certificate, which I'd rather not do.