Who pays when an AI shopping assistant buys the wrong thing?

One bank executive's son asked Meta's Muse AI agent to buy a coat. It arrived in the wrong size. Now the question of who pays for that kind of mistake is worrying banks, card networks and payment companies. Wells Fargo has already told customers that if they hand an AI tool their login, they may be liable for its errors.

What happened

Cameron Fowler, CEO of Early Warning Services, told the story of the red coat at the Money20/20 conference. His company runs the Zelle payment service and the Paze digital wallet, and seven large U.S. banks own it. He said rules and laws on liability, data access and what a customer actually intended have lagged far behind the technology.

Meta released Muse in the U.S. and Canada in September. Meta says shopping is the top task among its 10 million early users. Amazon has also refused to let Meta's agent into its shopping sites.

What banks are saying

PNC CEO Bill Demchak was blunt. He said tech companies would need to take on liability for "breaking all the crap they're about to break." He called them "kids in a room with a new toy" and said this is money, not a game.

Wells Fargo put it in writing in an Oct. 2 customer email: "If you give an AI tool your username and password, you may be liable for any mistakes made by the AI tool."

Why the rules are unclear

Stripe's John Piazza said there is no case law on liability for agent errors. Case law means past court rulings that settle who is responsible. Standards are still being built.

Andrew Lambert of Cross River Bank explained one gap. In normal card payments, networks steer behavior through fees and chargeback rules. A chargeback is when a payment is reversed after a dispute. An agent platform sits outside that system, so those tools do not work the same way.

Visa's Kaitlan Moran said a detailed audit trail, meaning a clear record of what the agent did and who approved it, is extremely crucial. Visa, Mastercard and American Express have each adopted different approaches. Google's Stavan Parikh said some of the new infrastructure has not been rolled out yet.

What it means for you

• Giving an AI tool your bank login may leave you responsible for its mistakes.
• A wrong-size coat is a small loss, but the same question applies to larger purchases.
• Read your bank's notices about AI tools before you share account details.

What happens next

Card networks are being urged to give clearer guidance, and industry standards are still under development. No court has yet settled who pays when an agent gets it wrong.