A phantom invoice from Anthropic's Stripe billing grew roughly tenfold in a single day, the user reports zero usage, and the company will only say it cannot discuss individual accounts.

A Korean Claude user says Anthropic's billing system tried to collect $16,627,739.70 from him this week, an amount his own account activity does not come close to explaining.

According to ZDNet Korea, the first email arrived on July 7 at 10:20 PM, a "payment unsuccessful" notice for $1,669,875.90, about 2.5 billion won. A day later, on July 8 at 11:42 PM, a second notice arrived for $16,627,739.70, about 25.1 billion won. The bill had grown roughly ten times in 24 hours.

The emails came through Stripe's invoicing system, which Anthropic uses as its payment processor. The user initially suspected phishing, a reasonable instinct given how common fake Stripe invoices are, but he told ZDNet that both the sender address and the payment link resolved to Anthropic's official domain.

The stranger part is what his account showed. Per ZDNet, the user says he was on the free plan, had no payment card registered, and found zero API usage when he reviewed his own activity. Bank alerts he posted complicate that picture. Screenshots show his KB Kookmin check card declining two overseas charge attempts on July 8, at 6:01 PM and 7:41 PM, from a US merchant listed as "ANTHROP," both rejected for exceeding the card's per-transaction limit. How charge attempts reached a card he says was not registered has not been explained.

No money appears to have moved. Every attempt in the material failed or was declined.

Anthropic told ZDNet that individual account matters are difficult to confirm in specifics. As of publication, the company has not said whether the invoices were a billing error, and the user says he will post updates as the situation develops.