It's a smart contract. Someone (a company) puts a bunch of kda in at the beginning and then sets a very small gas limit so that people can't go over it. You can also add all sorts of restrictions like "only give gas to people using it to use a specific contract"
Why would that company or someone put a bunch of kda ? What they get in return ?
Because gas fees are very cheap on kadena, so it's not a significant amount. Kaddex could put $50 worth of kda into their gas station and fund multiple years of their users interactions with the contract
This way, if you want to swap kbtc for, say, adk on kaddex, you don't actually need to have kda to make the transaction
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