The Thirty Pieces of Silver:

The 30 Pieces of Silver: Then one of the twelve, called Judas Iscariot, went unto the chief priests, and said unto them, What will ye give me, and I will deliver him unto you?" And they covenanted him with thirty pieces of silver. — Matthew 26:14-15
The Thirty Pieces of Silver are the most infamous "blood money" in all history. Incredibly, a handful of these shekels of Tyre, the same type used to pay Judas, have survived to the present day, and Worldwide Treasure Bureau, in its never-ending quest for the great treasure of history, has acquired a few choice specimens of this important type.

Modern historians and biblical scholars have concluded that the "Thirty Pieces of Silver" were silver coins, called shekels, which were minted in Tyre, a prosperous city on the coast of Lebanon. These large silver coins (about the size of a half-dollar) were the most widely-circulated silver coins of the Holy Land in Christ's day. They were of such legendary purity that the Scribes and Phariesees at the temple of Jerusalem decreed that they were the only coins that could be accepted by the temple treasury. Since the temple treasury contained only shekels, this is undoubtedly the coin which the priests offered to Judas in return for information on the whereabouts of Jesus.

The Temple Tax Coin ".go to the sea and cast a hook, and take up the fish that first cometh up; and when thou has opened his mouth, thou shalt find a piece of money: that take, and give unto them [the temple tax collectors] for me and thee." Since the tax was one half shekel per man the coin would have to be a shekel to pay the tax for both Jesus and Peter. Matthew 17:24-27