Here. As opposed to individual Indian payday lenders like Western Sky Financial.
An excerpt:
To date, state actions, class action cases, and federal agency actions have yielded mixed results. Most agree that federally recognized, sovereign tribes have the authority to engage in internet lending to state residents without those tribes being subjected to state authority. However, the extent to which tribal sovereign immunity shields service providers that assist tribes engaging in this business remains to be seen, as does the proper role of federal agencies such as the FTC and CFPB. Ultimately, Congress may be asked to establishlaws regulating various tribal lending practices and jurisdiction over them.
Turtle Talk 