{"type":"firestarter.listing","listing":{"id":"lst__0SJfZCN","product_name":"Chest Expander Replacement Springs","category":null,"description":"If you’re here, we can only assume one thing:You’ve been working that chest expander like it owes you rent, and now the springs are begging for mercy.But even the mightiest springs need a break eventually (you know, science and stuff). That’s where this 7-pack of replacement springs comes in.These are the same high-tension beauties that come with your OG Chest Expander, designed to keep your pecs pumped and your workouts flexin’. Whether you snapped a spring mid-sesh (epic) or you’re just prepping for future gains, we’ve got your back (and chest, and arms).Compatible with:- Chest Expander\n","images":["https://cdn.shopify.com/s/files/1/0654/3346/9125/files/sp-expsprngs-7pk-01.jpg?v=1764591800","https://cdn.shopify.com/s/files/1/0654/3346/9125/files/sp-expsprngs-7pk-02.jpg?v=1764591800"],"price":31.99,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:46:45.400Z"},"share_url":"https://firestarter.network/l/lst__0SJfZCN","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__0SJfZCN' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Chest Expander Replacement Springs' and a budget_max comfortably above $31.99 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."]}}