{"type":"firestarter.listing","listing":{"id":"lst_5I9xvuMd","product_name":"Formula 55","category":"Effects","description":"Big and powerful, yet refined, the Formula No. 55 melts into your amp, transforming it into a wide ranging tweed monster!The Formula No. 55 is a Foundation Overdrive that reproduces, in exact detail, the preamp section of the classic Fender™ tweed 5E3 Deluxe using an all-discrete JFET-based signal path. The Volume and Tone controls replicate, part for part, the circuitry of the 5E3, giving you authentic tweed amp response. The output section is designed to give you punch and volume with a low output impedance to drive your amp perfectly. Set the Hi-Lo button to \"Lo\" for the cleaner response of a vintage tweed. \"Hi\" is like hot rodding your amp by swapping in higher gain tubes.","images":["https://cdn.shopify.com/s/files/1/0370/1873/0628/products/F55_shopify-01-min.png?v=1672793938"],"price":189.99,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-20T16:26:04.264Z"},"share_url":"https://firestarter.network/l/lst_5I9xvuMd","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_5I9xvuMd' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Formula 55' and a budget_max comfortably above $189.99 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."]}}