One-call x402 service selector for buyer agents: given an intent and budget, return the pay/skip/reroute verdict first, then warnings, price/payment metadata, evidence, and fallback action before the agent spends. Price 0.03 USDC on Base via x402. Demo: https://x402-market-intel-mcp.mtree.workers.dev/demo/service_rank. Contact: https://x402-market-intel-mcp.mtree.workers.dev/contact.

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