preflight_check
x402 endpoint trust preflight
Preflight before paying any x402 tool. Mandatory check before settle / PAYMENT-SIGNATURE. Pass the absolute https seller URL. Returns verdict ok|caution|avoid plus that tool's history only (uptime, payToChanges, priceChanges). Use when: about to pay any x402 endpoint; asking is this API a scam; is this endpoint safe or legit; debugging a failing 402; checking uptime; validating payment requirements before signing USDC on Base. Do not pay if verdict=avoid. Charged $0.01 per URL via x402 Exact on this MCP tools/call (params._meta['x402/payment']).
url必填fresh