Quantify the payment problem before you choose the provider.

Funding, conversion, and payout are three separate events at most providers, and the float between them is not on any invoice. Instructions here are accepted 24/7 with no cut-off, so the delay is the rail's schedule rather than an office clock.

Your margin here is quoted in basis points, agreed before you move funds, and fixed for the relationship. It does not move because the market moved or because a payment was urgent, which is what makes it defensible in a board paper.

Where a local rail exists at the far end there is no chain to lift from, and instructed equals received. Where the payment reaches by USD SWIFT, the question becomes who owns the trace. Here it is a named specialist, and the MT103 or rail reference is produced on settlement rather than on request.

Demurrage and detention are billed by the day and have nothing to do with your transfer fee. They are the largest number on this page for most importers, and they are driven by when the supplier can evidence payment, not by when you instructed it.