Just going to mention this is incorrect. First, you would need to be able to tie your blood to one of the federally recognized tribes, second DNA testing is not recognized it has to be through verified ancestry, and third even if you meet the blood requirements (most commonly 25% or 1/16th with a full blood great grandparent) and successfully petition to be put on a registry of a tribe that has gaming (about 40% of them), and which provide per-capita payments (about 15% per my googling), you likely would not get any disbursment as they are are paid out top-down.
I have lots of family that are on official registers for multiple tribes, all of which have associated gaming, and not a single one of them has ever got a direct payment. One of my cousins friends is ostensibly FBI (full blood indian) and is a tribal elder who actually works part time in a casino. And he does get a disbursement (~2-3k a year).
I have heard of some groups that get ridiculously large payments, but I believe they are rare and wouldn't be open to someone who showed up with an online DNA test.