Hello, I am developing a custom website for a client, and he wants an IDX feed.
I have never worked with IDX before.

Here's my initial questions:
1) Is there just one IDX feed, or are there many?
2) How can I find out which one is right for my client's area?
3) Is it possible to get a raw or any IDX feed for free?
4) I don't need a frontend or any third party software, as I am developing my own... but everywhere I look, I see third parties offering what appears to be "pass-through" services. Is this the standard way of getting it done? I would like to skip any middlemen if possible.

Thanks, I appreciate the advice.