An amateur mistake cost this non-fungible token (NFT) collector one million dollars.

Twitter user Dino Dealer wrote that EtherRock was listed for 444 wei instead of 444 ether. A horror story as wei is the smallest denomination. In fact, according to Entrepreneur, one ether equals 1,000,000,000,000,000,000 wei. Therefore, the lucrative million-dollar NFT sold for nearly a penny.

For those unfamiliar with EtherRock, it launched in 2017 after CryptoPunks, and according to the company’s website, only 100 are available. With each new addition, the rock’s value will increase. Last October, a bid for $3.5 million was placed for one EtherRock, Vice reports. Dino Dealer was hoping to secure his big win but the collector was greeted with disappointment instead.

“How was your week? Mine? I just mistakenly listed @etherrock #44 for 444 wei instead of 444 eth,” user Dino Dealer wrote on Twitter. “A bot acquired it on the same block and tried to flip for 234 eth. (SIC) In one click, my entire net worth of ~$1 million dollars was gone. Is there any hope? Am I GMI? Can snipers show mercy?”

New Owner Listed NFT For $600K

After realizing the mistake, Dino Dealer sent a series of messages requesting a refund on Etherscan.

“Hello ser. Can you return the etherrock? I made a huge mistake. Your bot snapped it up in the same block as my transaction so I never had a chance. I hope you can find it in your heart to show mercy, please?” Dino Dealer wrote in the comment section.

As of this moment, it doesn’t appear as though mercy was shown as the user currently has the NFT listed for 234 ETH ($600,000 USD), Vice reports.