Here you have a kiva loan at 71%: http://www.kiva.org/lend/562406 (though it's not exactly "interest rate", it's "portfolio yield", and also includes the fees. It's basically the cost of the loan, on a yearly basis.
I don't think that 71% is very different from a loan shark, and I don't understand why Kiva would support such companies.
Then they have loans like this, as 22%: http://www.kiva.org/lend/565431, and that's where I lend my money.