Why this pair behaves the way it does
Bitcoin is a UTXO chain: your BTC deposit has to be mined, and until it confirms it can still be replaced. Cambio waits 2 confirmations before sending your BNB, so the Bitcoin side sets the pace here, not the BNB Smart Chain side.
BNB is BNB Smart Chain's own coin; the payout pays its cost from the amount itself.
Floor on BNB Smart Chain: 0.35%. Below that the corridor stops covering settlement.
BNB on BNB Smart Chain carries 18 decimals, so every amount on this page is quoted to that precision and no further.