A more thorough explanation:

IN EXCAMBIO

in excambio (in eks-kam-bee-oh), adv. [Law Latin] Historically, this phrase means "in exchange." It was commonly used in deeds of exchange.

1. "I will give you my horse in excambio for your cow."

2. "The two parties agreed to exchange their lands in excambio."

The first example shows how the phrase can be used to indicate a trade or swap between two parties. The second example illustrates how the phrase was used in legal documents, specifically in deeds of exchange, to indicate the transfer of property or assets between two parties.