Stablecoin settlement

An agent that pays per API call needs a unit that still means the same thing an hour later. Stablecoin transfers give it one: a price can be quoted in cents, a budget can be enforced, and a payer's balance does not need re-checking against a market. Nearly all agent payment rails settle this way.

Settlement is observable. A transfer to a catalogued seller address is a fact on a chain, which is how a nominal seller — one that has merely registered a price — is separated from one that has actually been paid.

A peg is a design, not a promise. Sato Hub records which asset a payload declared and what settled; it makes no claim about any issuer's solvency, and it never sends a payment, so delivery is never observed.