Rent, family, a subscription billed abroad. Cashrou costs it from the rate you were quoted and the fee your transfer app charges, so the payday routine knows what it really takes out of this paycheck.
Sending money abroad is never the mid-market rate. It is the rate your app gave you that morning, plus a fee, and a budget built on anything else is short every month.
You enter the rate, and the day you confirmed it. Nothing is fetched: a rate looked up now is wrong by the time the transfer goes out, and your remittance app uses its own anyway.
What your transfer app charges per wire is held with the rate and added to what the bill costs you at home, rather than quietly appearing on the account afterwards.
Where a currency costs nothing to send above a certain figure, Cashrou holds that threshold too, so a bigger transfer is not charged a fee it would not really pay.
The bill sits in the payday it falls in, in your own currency, alongside everything else that has to come out of that paycheck.
The rate is set once per currency, not once per bill.
The figures are yours rather than a market feed, which is the point: a rate you were actually given is the one you will actually pay. The day you confirmed it is shown beside it, so a stale rate says so.
Seven days free on the web app. $6.99 a month or $49.99 a year after that.