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Requires EVM_PRIVATE_KEY on this host; otherwise use x402.probe for a no-spend 402.","inputSchema":{"properties":{"agent_id":{"default":null,"description":"Optional agent identity for quota accounting.","title":"Agent Id","type":"string"},"body":{"default":null,"description":"Optional raw request body for POST/PUT. Omit for GET.","title":"Body","type":"string"},"headers":{"additionalProperties":{"type":"string"},"default":null,"description":"Optional extra request headers as a string map. Omit if none.","title":"Headers","type":"object"},"max_price_usdc":{"default":null,"description":"Optional spend ceiling in USDC. Example: 0.10. Calls above this are blocked.","title":"Max Price Usdc","type":"number"},"method":{"default":"GET","description":"HTTP method for the paid request. Default GET.","title":"Method","type":"string"},"preferred_network":{"default":null,"description":"Preferred CAIP-2 network. Example: 'eip155:8453' (Base mainnet). Omit to use the server default. 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