CAT-21 is a novel protocol that utilizes Bitcoin transactions and the Ordinals Theory to mint unique digital collectibles – CAT-21 ordinals. Each CAT-21 ordinal is linked to a unique pixelated cat image with various traits, offering a fresh and playful perspective on Bitcoin transactions and the Ordinals theory. Why? Because it’s fun, and Ordpool currently lacks a mascot!



Airdrop & Super Premint
Start: April 10, 2024, 4PM UTC
Max Mint Amount: 15

Start: April 10, 2024, 5PM UTC
Max Mint Amount: 10

Start: April 10, 2024, 6PM UTC
Unlimited, unleash the cats








Mint mechanics

CAT-21 ordinals are free. Completely free, no strings attached. There is no pre-allocation, and there are no hidden fees. You only pay the fees that go to the miner. We worked super hard to make the protocol as efficient as possible. To rescue one cat, you only have to pay the fee for a Bitcoin standard transaction – which is around 2-3 USD in Bitcoin.
We will do a short pre-mint phase, so brave degens can ape into the project earlier! (earlier is better).

  • 100 airdrops
  • 2.500 super premint spots
  • 7.500 premint spots


The CAT-21 protocol is unstoppable and can generate an unlimited number of unique cats. So, there is no hard cap on the collection size. But all cats are tracked by our indexer, and every cat gets an incremented number. You don’t want to miss your chance to get a sub 1k, 5k, and 10k cat, do you? Everything will be open-source, of course. Meow!


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