No one established a standard currency for the Roman Empire. The Roman coins evolved as a standard currency as the Roman Empire expanded. The conquered territories were annexed to the empire, became Roman provinces and the Roman coins became their currency as a result of the annexation. The Roman coins also became useful as a standard currency as thriving trading neworks developed around the empire

Roman currency.

It could mainly be the Roman currency.

The bile times the currency was the talent. But they also had the roman currency which was used by the Jews , to pay their taxes to the Roman emperror.

See: Roman currency