Why not add a basic http Auth to the site? Most web hosts provide a simple way to protect a site or directory.

You can have a simple username and pass for humans, but it will stop scrapers as they won’t get past the Auth challenge unless they know the details. I’m pretty sure you can even show login details in the Auth dialog, if you wanted to, rather than pre sharing them.

I find it strange that they don’t have any published API docs. What’s the strategy?