Customers of Amazon Web Services discovered abnormally high billing estimates in their accounts on Friday morning, with some users shown charges exceeding billions of dollars for services they had not actually used. The malfunction originated in Amazon's billing calculation infrastructure, surfacing late Thursday and persisting after the company's initial rollback attempt failed to restore accuracy.

Amazon acknowledged the pricing discrepancies and assured affected customers that these estimates bore no relationship to genuine charges or actual consumption. The company offered sparse additional detail regarding the fault's cause or whether any accounts had been suspended as a consequence, estimating that restoration would require several additional hours of investigation.