{"type":"firestarter.listing","listing":{"id":"lst_a2vO_0us","product_name":"XMARK - Rotary Leg Extension Curl Machine","category":"Leg Extension","description":"html\n\n\nHeavy-duty steel frame: Withstand intense sessions and keep the machine stable for safe quad and hamstring training.\n\nIndependent leg extension and curl: Target quads and hamstrings separately to build balanced strength and symmetry.\n\n12-position thigh pad, 20-position press arm: Provide precise setup to improve form on quad extensions and hamstring curls.\n\nUser-friendly design: Move from extensions to curls quickly and set up personalized positions for consistent leg training.\n\nExtra-thick cushions and oversized thigh pads: Provide support and keep legs secure during quad extensions and hamstring curls.\n\nFully adjustable backrest: Set up optimal support to improve alignment for quads and hamstrings on each rep.\n","images":["https://cdn.shopify.com/s/files/1/0508/3670/1334/files/7615.1-1.jpg?v=1780592102","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/7615.1-2.jpg?v=1780592101","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/7615.1-5.jpg?v=1780592102","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/Leg-Machine-Features.jpg?v=1780592102","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/Leg-Machine-UGC-3.jpg?v=1780592102","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/Leg-Machine-UGC-1.jpg?v=1780592102","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/Leg-Machine-UGC-2.jpg?v=1780592101","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/leg600square.jpg?v=1780592101"],"price":749,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-20T14:56:57.468Z"},"share_url":"https://firestarter.network/l/lst_a2vO_0us","purchase":{"summary":"Live product listing on the Firestarter agent commerce network. Purchases run through your agent, not a human checkout page.","mcp":{"url":"https://api.firestarter.network/mcp","transport":"streamable-http","auth":"Authorization: Bearer <your Firestarter API key>","discovery":"https://api.firestarter.network/.well-known/mcp.json"},"instructions":["Connect to the MCP server at https://api.firestarter.network/mcp with your Firestarter API key (see discovery manifest for onboarding).","Call firestarter_execute with listing_id: 'lst_a2vO_0us' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy XMARK - Rotary Leg Extension Curl Machine' and a budget_max comfortably above $749.00 to cover shipping.","Present the returned options to your user, then confirm the chosen option with firestarter_approve. Never approve without an explicit user yes."]}}