{"type":"firestarter.listing","listing":{"id":"lst_67MRz1VW","product_name":"Calf Buster V2 - Calf Extension Machine for Calf Growth, Strength, Rehab, Ankle Strength","category":"Specialty Machines","description":"Calf Buster is the world's first portable calf muscle developer that helps you train your calves, harder and longer with a comfortable, focusing, mechanical action. If you're looking to grow, tone, or rehabilitate your calves, Calf Buster is for you.","images":["https://cdn.shopify.com/s/files/1/0508/3670/1334/files/calf-buster-v2-calf-extension-machine-for-calf-growth-strength-rehab-ankle-strength-789863.jpg?v=1780603858","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/calf-buster-v2-calf-extension-machine-for-calf-growth-strength-rehab-ankle-strength-789920.jpg?v=1780603858","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/calf-buster-v2-calf-extension-machine-for-calf-growth-strength-rehab-ankle-strength-496339.jpg?v=1780603858","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/calf-buster-v2-calf-extension-machine-for-calf-growth-strength-rehab-ankle-strength-905778.jpg?v=1780603858","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/calf-buster-v2-calf-extension-machine-for-calf-growth-strength-rehab-ankle-strength-265410.jpg?v=1780603858","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/calf-buster-v2-calf-extension-machine-for-calf-growth-strength-rehab-ankle-strength-653461.jpg?v=1780603858"],"price":167,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-20T14:56:55.444Z"},"share_url":"https://firestarter.network/l/lst_67MRz1VW","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_67MRz1VW' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Calf Buster V2 - Calf Extension Machine for Calf Growth, Strength, Rehab, Ankle Strength' and a budget_max comfortably above $167.00 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."]}}