Never use your main "vault" wallet to mint something for free. Use a fresh wallet with just enough funds for gas.
If you are looking for a blog post about (where you only pay gas fees), If you meant a specific brand called "Longmint," please provide more details! free longmint
Scammers often post "Free Mint" links in Discord DMs. Only trust links from official, verified Twitter (X) accounts. Never use your main "vault" wallet to mint