{"type":"firestarter.listing","listing":{"id":"lst_MpHqpg68","product_name":"Mark Bell Sling Shot- Shake Handle Attachment (Pair)","category":"Tricep Shake Strap","description":"\n\n1.5 in double-ply Sling Shot material: Provide stretch for greater range of motion to train core and arms through fuller arcs.\n\nO-ring for cable connection: Set up on a cable machine to train arms and improve core stability; carabiner not included.\n\n5.5 in handle with 1.2 in or 1.5 in grip options: Target arms and core engagement and improve control during cable work.\n\nPatent-pending stretch design: Deliver deeper contractions and a stronger pump to build core stability with less weight.\n\n12 in total length when flat and 8 in attachment length: Provide compact control to improve core stability during movements.\n\nInspect before each use: Ensure safety and performance, as wear may increase with heavier weights over time.\n","images":["https://cdn.shopify.com/s/files/1/0508/3670/1334/files/ShakeStrap_HandleAtthmntStandard1.png?v=1780586057","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/ShakeStrap_HandleAtthmntStandard1-01.png?v=1780586059","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/ShakeStrap_HandleAtthmntStandard3-01.png?v=1780586061","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/ShakeStrap_HandleAtthmntThick2.png?v=1780586057","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/ShakeStrap_HandleAtthmntThick2-01.png?v=1780586060","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/ShakeStrap_HandleAtthmntThick3-01.png?v=1780586056","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/ShakeStrap_HandleAtthmntThick1.png?v=1780586057","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/HANDLESSHAKESTRAP_NSIMA_07152021-5.jpg?v=1780586055","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/HANDLESSHAKESTRAP_NSIMA_07152021-11.jpg?v=1780586055","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/HANDLESSHAKESTRAP_NSIMA_07152021-15.jpg?v=1780586060","https://cdn.shopify.com/s/files/1/0508/3670/1334/files/HANDLESSHAKESTRAP_NSIMA_07152021-16.jpg?v=1780586055"],"price":49.5,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-20T14:57:04.762Z"},"share_url":"https://firestarter.network/l/lst_MpHqpg68","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_MpHqpg68' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Mark Bell Sling Shot- Shake Handle Attachment (Pair)' and a budget_max comfortably above $49.50 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."]}}