Online payments broker PayPal has admitted it erroneously credited a man with $92 quadrillion. Chris Reynolds, 56, of Pennsylvania, found the amount when he opened his monthly statement.
But the error was quickly recognised and his account had returned to zero by the time he had logged in.
"This was obviously an error and we appreciate that Mr Reynolds understands this was the case," PayPal said in a statement.
The online money-transfer firm said it would offer to make a donation to a charity of Mr Reynolds' choice.
The $92,233,720,368,547,800 statement had been "quite a big surprise", Mr Reynolds told the Philadelphia Daily News, which first reported the story.
"I was skeptical," the 56-year-old told the Los Angeles Times of his staggering windfall. "And my skepticism was validated within two minutes."
When Reynolds logged into his PayPal account, his balance was back to where it was supposed to be: $0.
Though his onetime riches have vanished, Reynolds says he's pretty sure he knows what he would've done with the money had he been allowed to keep it.
"I'm a very responsible guy," he told the Philadelphia Daily News. "I would pay the national debt down first. Then I would buy the Phillies, if I could get a great price."