How much SBX can I send?
You can send up to 100 SBX in any 24 hours, and up to 1,000 SBX in any 30 days. Both windows are rolling rather than calendar-based: an amount you sent yesterday afternoon frees up tomorrow afternoon, not at midnight.
Only cash — the SBX other people sent you — can be sent. Credits cannot leave your account, so a transfer is refused when your cash balance is too low, even if your credits balance is healthy.
Accepting a payment request pays through the same transfer, so it counts toward the same limits as a transfer you start yourself.
Transfers are instant and cannot be reversed. Check the recipient before you confirm.
To buy from someone you don't know, use Marketplace checkout instead of a transfer. A Marketplace order gives you a payment record and a way to report a problem; a transfer gives you neither.