{"id":"ink_agent_checkout","price_usdc":0.002,"description":"Create an Ink-native x402/EIP-3009 checkout object for another agent or app — returns payment requirements, facilitator URLs, and a payment-required header","method":"POST","execute_url":"https://api.sys84.org/v1/services/ink_agent_checkout","payment_discovery":{"method":"POST","url":"https://api.sys84.org/v1/services/ink_agent_checkout","instruction":"POST without payment to receive HTTP 402 with PAYMENT-REQUIRED header, then retry POST with PAYMENT-SIGNATURE or X-Payment."},"payment":{"price_usdc":0.002,"pay_to":"0x64e4e6c18849ba687A468dcad0A582AC6f8089E4","network":"base:8453","asset":"USDC","docs":"https://api.sys84.org/quickstart"},"input_schema":{"amount_usdc":"number price to charge in USDC","pay_to":"string optional merchant wallet, defaults to SYS84 wallet","product_id":"string product or service id","resource":"string optional paid resource URL","description":"string optional checkout description"},"output_schema":{"checkout_id":"string uuid","payment_requirements":"object x402Version 2 requirements","payment_required_header":"string base64 header value","verify_url":"string facilitator verify URL","settle_url":"string facilitator settle URL"}}