Farcaster

Can I change the fname for an Fid? (Not add ens name)

yes, by sending a signed request from a wallet claiming an fname if it is not already taken, or by sending a signed transfer request from the wallet that owns the existing account. You can also check if the name is taken by checking the transfers of that name (if the transfers are empty then no one owns it I guess)

After claiming the name you have to also send a profile update message with username as the type and the claimed name as the value for it to be set at the protocol level

see related links for docs and my implementation (in rust, but it's just a wallet and an HTTP client):

Dad, geek, conversation liquidity provider. vrypan.net (home), /weatherxm (work), @l--o--l (fun). Also https://paragraph.xyz/@purplesubmarine

yes, by sending a signed request from a wallet claiming an fname if it is not already taken, or by sending a signed transfer request from the wallet that owns the existing account. You can also check if the name is taken by checking the transfers of that name (if the transfers are empty then no one owns it I guess)

After claiming the name you have to also send a profile update message with username as the type and the claimed name as the value for it to be set at the protocol level

see related links for docs and my implementation (in rust, but it's just a wallet and an HTTP client):

https://docs.farcaster.xyz/developers/guides/accounts/change-fname

https://github.com/0x330a-public/jesse/blob/master/src/warpcast.rs