{"type":"firestarter.listing","listing":{"id":"lst_ZQAEs1dk","product_name":"RumbleRoller 22\" Mid Size Xtra Firm Textured Foam Roller","category":"foam roller","description":"RumbleRoller Xtra Firm\nRumbleRoller Xtra Firm Rollers are constructed using the same patented series of bumps continuously knead the contours of your body, gently stretching soft tissue in multiple directions and effectively hitting trigger points but on a firmer roller.\nFirmer isn't always better. Going too firm jeopardizes your ability to use your roller on all body parts or to relax your muscles fully. This is why we generally advise all first time buyer consider the RumbleRoller Original products as first time purchases. So choose the firmness that best matches your current needs.\nXtra Firm (black): Extremely firm (about 36% firmer than Original), and only recommended for experienced users with especially dense muscle tissue that doesn't respond to normal massage pressure. This model does dig deeper into thicker muscles, but may be too painful to use on some body parts.","images":["https://cdn.shopify.com/s/files/1/0281/3339/2468/products/xtraFirm_midsize_800_1543a0f3-bd66-4088-938d-1c2e1f19afdc.jpg?v=1574112125","https://cdn.shopify.com/s/files/1/0281/3339/2468/products/features_a84e1144-c44f-401e-a7b3-9f32519032f4.jpg?v=1574112125","https://cdn.shopify.com/s/files/1/0281/3339/2468/products/RR_on_Skin_Orig_650x650_e196cdfe-d1fa-4b01-aeb2-defce85dc847.jpg?v=1574112125","https://cdn.shopify.com/s/files/1/0281/3339/2468/products/groups_ref_7252a1f1-34de-41c3-b279-5cc3be995ea3.jpg?v=1574112125","https://cdn.shopify.com/s/files/1/0281/3339/2468/products/Man_with_RR_on_Hamstring_3_800x800_e78b135e-f0f6-41e4-8dfe-d7a42d1e1f8f.jpg?v=1574112125"],"price":59.95,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-20T14:57:02.688Z"},"share_url":"https://firestarter.network/l/lst_ZQAEs1dk","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_ZQAEs1dk' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy RumbleRoller 22\" Mid Size Xtra Firm Textured Foam Roller' and a budget_max comfortably above $59.95 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."]}}