Major banks have quickly become behind-the-scenes allies of Internet-based payday lenders that offer short-term loans with interest rates sometimes exceeding 500 percent.

With 15 states banning payday loans, a growing number of the lenders have set up online operations in more hospitable states or far-flung locales like Belize, Malta and the West Indies to more easily evade statewide caps on interest rates.

While the banks, which include giants like JPMorgan Chase, Bank of America and Wells Fargo, do not make the loans, they are a critical link for the lenders, enabling the lenders to withdraw payments automatically from borrowers’ bank accounts, even in states where the loans are banned entirely. In some cases, the banks allow lenders to tap checking accounts even after the customers have begged them to stop the withdrawals…

The Federal Deposit Insurance Corporation and the Consumer Financial Protection Bureau are examining banks’ roles in the online loans…Benjamin M. Lawsky, who heads New York State’s Department of Financial Services, is investigating how banks enable the online lenders to skirt New York law and make loans to residents of the state, where interest rates are capped at 25 percent.

For the banks, it can be a lucrative partnership…Some state and federal authorities say the banks’ role in enabling the lenders has frustrated government efforts to shield people from predatory loans — an issue that gained urgency after reckless mortgage lending helped precipitate the 2008 financial crisis.

While the loans are simple to obtain — some online lenders promise approval in minutes with no credit check — they are tough to get rid of. Customers who want to repay their loan in full typically must contact the online lender at least three days before the next withdrawal. Otherwise, the lender automatically renews the loans at least monthly and withdraws only the interest owed. Under federal law, customers are allowed to stop authorized withdrawals from their account. Still, some borrowers say their banks do not heed requests to stop the loans…

While there are no exact measures of how many lenders have migrated online, roughly three million Americans obtained an Internet payday loan in 2010, according to a July report by the Pew Charitable Trusts. By 2016, Internet loans will make up roughly 60 percent of the total payday loans, up from about 35 percent in 2011, according to John Hecht…

Facing increasingly inhospitable states, the lenders have also set up shop offshore. A former used-car dealership owner, who runs a series of online lenders through a shell corporation in Grenada, outlined the benefits of operating remotely in a 2005 deposition. Put simply, it was “lawsuit protection and tax reduction,” he said. Other lenders are based in Belize, Malta, the Isle of Man and the West Indies, according to federal court records.

Screwing the working poor is just as important to these thugs as screwing the middle class.