Americans with the best credit may be hurt the most as the first phase of a credit card reform law takes effect, according to Schwark Satyavolu, the founder of a card-comparison Web site.

Lenders are raising rates across the board, said Satyavolu, the president and co-founder of BillShrink.com, which compares terms offered to consumers for credit cards, cell phones and gasoline. The company said the lowest average card rate is about 11.25%, up from 8.85% in January. The average for less creditworthy customers rose to 15.75% in July, from 13.75% in January.

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