get_add_funds_coinbase_pay_link

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Get a Coinbase checkout link, paid in USDC, that adds funds to the user's Atom account balance (the balance register_domain and purchase_domain pay from). Returns two URLs for the same payment: x402_url — an agent with an x402-capable crypto wallet (e.g. a Coinbase agentic wallet) pays it directly (POST, 402 Payment Required, signed retry); and checkout_url — the hosted page a human opens in a browser to pay with their own wallet. Use this when a balance purchase reports insufficient funds and the user wants to top up with crypto/USDC. Always present the exact server-computed price returned here — never recompute it. This tool charges nothing by itself. RIGHT AFTER handing over the link (or paying x402_url), start polling get_coinbase_payment_status with the returned payment_code — keep calling it while status is 'pending' and stop_polling is false (each call waits ~10s server-side). If stop_polling turns true, stop and show its user_message exactly as given; check again when the user says they have paid. The funds are only credited once that reports status 'completed' (poll again while it reports 'pending'). Then retry the balance purchase.