Three Core is a hosted server-to-server Prebid and OpenRTB header bidding service that connects a publisher's web, in-app, and CTV ad spots to a curated set of premium DSPs and direct buyers. It is sold to publishers, not advertisers.
How to open an account here, what it takes and the minimum spend.
Exchanges of the same type whose publishers are in the same markets, with the same formats, Best for and way in.