{"type":"firestarter.listing","listing":{"id":"lst_wbUu_mET","product_name":"Knotty by Nature Cork Massage Balls (Trail Recovery Tool)","category":null,"description":"Made in the USA using US sourced Natural Cork. Knotty by Nature Cork Massage Balls use natural cork and not compressed agglomerated cork particles. These massage balls are the lightest in its class. \nOur natural cork balls are made from pure, untouched cork straight from the bark of the Portuguese cork trees in California. Natural Cork Balls are manufactured from slices of real cork that are sustainably harvested. They show the beautiful natural lenticels (cracks and crevices) of natural cork.\nPerfect for use on the trail or at home.\nStuff Sack Option For Your BallsTo save on waste you have the option to select your Massage Ball with stuff sack or without\nSmall Massage Ball: 1.5\" weighing 0.24 ozOptional stuff sacks weighs 0.14 oz\nLarge Massage Ball: 2.0\" weighing 0.40 ozOptional stuff sacks weighs 0.17\nWhere are they made?Made in the USA for Hilltop Packs","images":["https://cdn.shopify.com/s/files/1/0528/9613/7401/files/knotty-by-nature-cork-massage-balls-trail-recovery-tool-6883460.webp?v=1781229914","https://cdn.shopify.com/s/files/1/0528/9613/7401/files/knotty-by-nature-cork-massage-balls-trail-recovery-tool-5693549.webp?v=1781229914","https://cdn.shopify.com/s/files/1/0528/9613/7401/files/knotty-by-nature-cork-massage-balls-trail-recovery-tool-8544575.webp?v=1781229914","https://cdn.shopify.com/s/files/1/0528/9613/7401/files/knotty-by-nature-cork-massage-balls-trail-recovery-tool-3892087.webp?v=1781229915","https://cdn.shopify.com/s/files/1/0528/9613/7401/files/knotty-by-nature-cork-massage-balls-trail-recovery-tool-6595414.jpg?v=1781229915","https://cdn.shopify.com/s/files/1/0528/9613/7401/files/knotty-by-nature-cork-massage-balls-trail-recovery-tool-7026465.jpg?v=1781229914"],"price":8.95,"currency":"USD","in_stock":true,"inventory_qty":39996,"dynamic_pricing":false,"listed_at":"2026-06-18T20:46:37.169Z"},"share_url":"https://firestarter.network/l/lst_wbUu_mET","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_wbUu_mET' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Knotty by Nature Cork Massage Balls (Trail Recovery Tool)' and a budget_max comfortably above $8.95 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."]}}