A Grumpy Cat Coin memecoin emerged in May, with a website using illustrations of the late real-life Grumpy Cat to promote the coin. Crypto influencers, including the "SlumDoge Millionaire", jumped on board to promote the token. (The "SlumDoge Millionaire" is Glauber Contessoto, a person who briefly became a paper millionaire from, as he claims, emptying his bank account, selling all his stocks, and maxing out credit cards to buy 5 million Dogecoin during the 2021 crypto frenzy. His holdings spiked to over $1 million in value, but he didn't cash out; they are now priced at around $365,000.)

However, Grumpy Cat's owner owns trademarks associated with Grumpy Cat, and it seems she has become aware of the coin. On May 18, she minted an NFT and transferred it to the Grumpy Cat Coin deployer address. The NFT image is a copy of a cease and desist letter representing Grumpy Cat Limited. The letter describes the coin offering as a "blatant and willful infringement of our client's trademark rights", and insists that the coin creators stop all activities related to the coin offering or face legal action. The letter also mentioned that the URL of the project website — grumpycat.fyi — was a violation of the Anti-Cybersquatting Consumer Protection Act. The project subsequently changed its domain to gccoin.fyi in an apparent effort to avoid this issue.

Simultaneously, a message addressed to holders of the Grumpy Cat Coin was posted to Grumpy Cat's Twitter account, describing the token as a "desperate, sad attempt to scam unwitting traders" by "SlumDoge Millionaire and their cohorts".

• Grumpy Cat cease and desist NFT
• Tweet by RealGrumpyCat