{"type":"firestarter.listing","listing":{"id":"lst_u49JYZ9C","product_name":"XMARK - Viper Roller J-Cups","category":"J-Cups","description":"\n\nRoller J-cups: Center the bar on your power rack to set up precisely and save energy for the lift.\n\nPrecision alignment: Provide consistent starts on a squat rack to improve focus and bar path control.\n\nSmoother setup: Reduce bar adjustments before lifts to keep effort for squats and improve focus.\n\nQuick bar centering: Move the bar left or right to ensure balanced unracks and deliver confident starts.\n\nPower or squat rack use: Support fast setup changes between sets to keep pace high and improve training focus.\n","images":["https://cdn.shopify.com/s/files/1/0508/3670/1334/files/RA-5111._b29a4d73-770c-4d91-a8b1-02dca47cd035.jpg?v=1780592050"],"price":133,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-20T14:56:57.399Z"},"share_url":"https://firestarter.network/l/lst_u49JYZ9C","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_u49JYZ9C' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy XMARK - Viper Roller J-Cups' and a budget_max comfortably above $133.00 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."]}}