HTTP POST files here:

curl -F'file=@yourfile.png' https://0x0.st

You can also POST remote URLs:

curl -F'url=http://example.com/image.jpg' https://0x0.st

If you don't want the resulting URL to be easy to guess:

curl -F'file=@yourfile.png' -Fsecret= https://0x0.st
curl -F'url=http://example.com/image.jpg' -Fsecret= https://0x0.st

Auto-generates copy/pasteable progress bars using a variety of Unicode characters, given a target percentage and min/max size