Settlement and delivery proofs

Two settlement paths. Assets fill atomically in the award; API goods release on a receipt or a delivery attestation.

Assets: atomic

For a tokenized stock or ETF, the award pulls the asset from the seller (pre-approved) to the buyer and pays the seller in the same transaction. A seller that cannot fill (no allowance, no balance) is marked Failed and slashed in that same call, and the buyer gets everything back. The house stock seller quotes from the chain's Uniswap pools and buys its inventory through the router.

API goods: proof of delivery

The seller delivers through the relay: it pushes the result, or the relay fetches it from the seller's x402 endpoint. The escrow releases on the buyer's receipt (the buyer signs release_receipt), or on release_attested sent by a key in the attester set. The attester set is one key run by the house today; more join through the timelock. Payment and delivery are one exchange, so a buyer cannot take the goods and withhold a receipt.

What is checked

The promised thing, in the declared format, by the deadline, at the signed price: the MIME type, the JSON schema, the size limit and the time. Quality is not judged. A well-formed but poor answer goes on the seller's public record, where buyers' signed ratings are shown.