There were, according to Aristotle, ten main officials with responsibility for the proper working of the port. This meant, in particular, commercial operations in the Emporium, the port's trading market.

There were five, and their duties corresponded to those of the metronomoi in the market: they monitored the correct use of weights and measures in the Piraeus. Their duties were confined to the port's cornmarket area. They monitored the grain-merchants, and if they did not discharge their duties conscientiously they even risked the death penalty.

How many of them there were we do not know. But they were officials with responsibility for collecting tolls on incoming and outgoing produce. All goods, including grain, were subject to a tax at the rate of two per cent of a cargo's value. This duty was paid in money, not in kind.

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