The Greek cities of the Black Sea shipped the grain that fed Athens. Pontica trades the new staple.
Along the Pontus Euxinus, the colonies of the Black Sea coast grew and shipped the grain that fed Athens. Whoever held the sea routes held the city's bread, and the price of a cargo was argued out in the open, in the agora, where anyone could hear it.
The obol was the small silver coin of that world. It paid for passage and for a seat at the theatre: a coin you spent, not one you hoarded. Its face carried the owl of Athena.
Inference is the staple now. Every agent, every assistant and every tool that thinks runs on it, and most of it is bought through subscriptions and invoices nobody else can see. Pontica is an agora for it, on Robinhood Chain: inference is funded, traded and spent in OBOL credits, and every step leaves a public record.