NFT collector Dino Dealer has revealed on Twitter he mistakenly sold his Etherrock collection token for 444 wei instead of 444 ETH ($1 million). Wei is one quintillionth of ETH, so 444 wei is worth less than one cent, which is not enough to even pay a transaction fee on the Ethereum network.
The collector has said the token was sold in less than a second. As soon as the order appeared on the market, a special bot that tracks NFT prices immediately made a purchase.
Traders and NFT holders use special bots that monitor the largest marketplaces, such as OpenSea or LooksRare, looking for tokens offered for sale at a price well below the market price.