{"method":"POST","priceUsd":0.001,"network":"eip155:8453","description":"Diagnose an x402 Base USDC payment challenge against an explicitly authorized payee allowlist and spending cap. Never signs or buys.","example":{"challenge":{"x402Version":2,"accepts":[{"scheme":"exact","network":"eip155:8453","asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","payTo":"0xf7eb4b12d673df433d76b2dbd9ca41db3fe1836e","amount":"1000"}]},"max_atomic_usdc":"1000","allowed_payees":["0xf7eb4b12d673df433d76b2dbd9ca41db3fe1836e"]}}