It's not quite clear what happened, but it seems likely that it may have been a listing error. Onekiller had posted and then canceled listings for the ape several times in the past week and as recently as four hours before the sale, all between 250 and 145 ETH, suggesting that they had control of their account and made a mistake while entering the listing value.
Collector sells Bored Ape for $513,000 less than they paid for it
NFT collector onekiller purchased Bored Ape #7256 for 188 ETH a month ago — at the time worth about $513,000. On June 1, they sold the ape for 0.088 ETH, or $161.
Another Bored Ape owner makes a typo, sells NFT for $180,000 less than they intended
An NFT collector trying to list their Bored Ape NFT for sale on OpenSea made a typo, and accidentally listed it for sale for 10 ETH (around $19,000) instead of 105 ETH (around $200,000). The NFT was quickly bought up before the trader had the opportunity to correct their mistake. It is common for people to run bots that automatically buy pricey NFTs that are listed for sale far below a collection's floor price, as this one was.
The trader later confirmed on Twitter that it was their mistake rather than an account compromise or some other hack: "Yep, was a fat finger. Was trying to list at 105. Never thought it'd happen to me. Devastating."
Meanwhile, the NFT's new owner has it listed for sale for 110 ETH (about $219,000), which will net them a tidy profit if they find a buyer.
NFT collector accidentally sells their rock for close to $0 instead of over $1 million
The owner of EtherRock #44 tried to list their NFT for sale for 444 ETH (almost $1.2 million), but erroneously listed it for 444 wei — the fractional unit of ETH typically used for representing transaction fees. A bot programmed to look for listings like this one, where a pricey NFT is listed for far below its average or floor price, quickly snapped up the NFT before the buyer could remove the listing. The buyer of the NFT eventually tried to flip the NFT for 234 ETH, (around $625,000). The trader wrote on Twitter, "In one click my entire net worth of ~$1 million dollars, gone".
Another typing error proves costly to an NFT collector
A misplaced decimal point caused an NFT trader to sell their "beloved" Doodle NFT for 0.37 ETH (about $1,500) instead of their intended 3.7 ETH (about $15,000). The trader tried begging on Twitter to buy back the NFT, then to get back "maybe the ETH i lost.. minus all royalties and such..". Two days later they posted, "well, i don't think i'll ever get back what i lost.. had to take a break yesterday to not go crazy over this. 3.7 ETH is a lot of money to lose for me." This happened two days after a different trader made a similar, $300,000 mistake.
Typing error costs NFT trader nearly $300,000
An NFT trader made a typing error when entering a listing price, accidentally listing his Bored Ape NFT for 0.75 ETH (about $3,000) instead of 75 ETH (about $300,000). The NFT was instantly bought by a bot account. The BBC writes, "In traditional banking transactions, such errors are usually reversed easily if the bank facilitating them is told about the mistake quickly. But in the unregulated crypto-trading market, there is usually no way to reverse such a sale."