x402 Seller Trust Probe ($0.008/call): Vet an unknown x402 resource before paying it: live-probe its 402 handshake and payment requirements, check its bazaar declaration and whether its schema regexes are RE2-safe (Bazaar-indexable), and look it up in the CDP discovery index for listing and freshness, then return a 0-100 trust score with reasons. Fully keyless.

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