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It depends; part of their appeal is they can get you significant savings by taking longer.

But that’s not because of transmission times (updating a database is faster than a blockchain), it’s because they get a better price for currency by batching you up with other people.

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well, what's the minimum time for cross-country transfer, anyway, and what sorta fees does it correspond to, if you know?

Calculator on the front page should say. It depends on the currency pair, but sending from the US is usually as fast as any other ACH transfer, between instant and overnight for me.

oh, ok; most interesting. that means it's a solution then, well, aside from things like (a) privacy concerns and the associated (b) ability for them to arbitrarily censor, delay, hold etc transactions which we have certainly see e.g. paypal do.

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