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On USD pegged loans you might get a view and a button with "Update USD rate"
To know the USD/ETH rate, our DAPP fetches the rate from oraclize.it.
This rate needs to be pulled from the dapp by pressing the "Update USD rate" on USD based loans.
The rate expires after one hour. Therefore, when you repay a loan you need to pull the rate once more.
Charge rate of USD ETH rate is around 0.0049 ETH per request at the moment.