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I have been using it for some time. There was a limit of about $100 USD in value. But I don't know if it's still in effect. You can follow @v4v.app for updates.

I signed up for this last time but I was afraid to send some funds in it.

just swap some of your HIVE to Sats to test it and send them out to your trusted LightningWallet - works fine.

How about the transaction fees, hope they are low?

there are fees between 0.5-2% depending on the ammount you swap - not actually low. However, it is tech in the making and (to my knowlege) the only way to swap HBD directly to sats without KYC.