x402 developer tool. Use to find out whether an x402 seller is listed in Coinbase CDP Bazaar and, if not, why. GET with required url (host or https URL). Reads CDP discovery and the host's /.well-known/x402, then sends one unpaid request per route; never pays. Returns JSON: verdict, per-route indexed status and networks (Base, Solana), and fail/warn findings each with a fix line. https only; private targets blocked. Errors are not charged.

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