546 sats is the minimum. Anyone can claim, even from exchanges/online wallets. Your wallet/exchange/faucet must support small payouts (all money sent is burned) and it must support segwit (to allow paying to bc1 long addresses).

Set a nice fee because I've noticed that some miners sort payments by fees. You have to be on top to win.

For people who don't have BTC, segwit faucet would be ideal for this purpose.