Second Temple: Moneychangers The Temple authorities allowed no acceptance of foreign money with any foreign image so the money changers would sell "Temple coinage" at a very high rate of exchange. The moneychangers assessed a fixed charge for their services.
The Money Changers in Herod's Temple
The word "moneychanger" means money-banker or money-broker. They would make large profits at the expense of the pilgrims. Every Israelite, rich or poor, who had reached the age of twenty was obligated to pay a half shekel as an offering to Jehovah into the sacred treasury. This tribute was in every case to be paid in the exact Hebrew half shekel. At Passover everyone in the world who was an adult male and wished to worship at the Temple would bring his "offering" or purchase a sacrificial animal at the Temple. Since there was no acceptance of foreign money with any foreign image the money changers would sell "Temple coinage" at a very high rate of exchange and assess a fixed charge for their services.
The judges, who sat to inspect the offerings that were brought by the pilgrims, were quick to detect any blemish in them. This was expensive for the wealthy pilgrims, not to say how ruinous this was for the poor who could only offer their turtle-doves and pigeons. There was no defense for them or court of appeal, seeing that the priestly authorities took a large percentage on every transaction. https://www.bible-history.com/jewishtemple/JEWISH_TEMPLEJesus_and_the_Temple.htm