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No, you can send a different amount to us, that calculator is just an estimator so that you know how much we will send you for a given amount. You can always send more or less. But I recommend using the estimator with the amount you plan to send, to reduce the chance for a surprise in the amount you receive.

that is strange... i sent a small amount and got a refund by you, why?

Transfer 2.253 SBD to blocktrades c4fab5ac-4950-4e7a-b8d5-442e3403ac0a

The amount you sent was too small to pay the bitcoin transaction fee. I happened to notice the transaction had failed, so I just manually refunded it. If you really want to buy bitcoin, I would send 30 SBD or so. If you just want to go to fiat, I would use Litecoin or Ethereum as your intermediate coin instead of bitcoin now. Currently bitcoin transactions cost about $5 USD or more.

Thanks, so one more question please: is $5 the cost per bitcoin transaction (regardless the amount)?

Yes, there is a fixed bitcoin fee per transaction regardless of the amount of the transaction, and the fixed fee is currently about $5 USD. It's why I wrote this post, to warn people about this issue when buying, so they don't pay unnecessary fees.

Thanks! OMG, I wished I knew this a lot sooner.. I have wasted so much transaction fees...

The fees weren't so high in the past, but it's gone up a lot for bitcoin recently.

ok... i see. the amount is too small... thanks.