Pre-spend check for one x402 endpoint in a single signed response: fresh liveness probe on both verbs, parsed quote, payability verdict (payable / malformed 402 / cannot pay on either verb / unpriced), whether the payTo exists on-chain, the seller's other endpoints and settlement integrity, the scout's real-payment delivery result, and a honeypot scan of the listing text. Returns recommendation: pay | caution | avoid, with reasons. Call it before the first payment to an unfamiliar endpoint.

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