{"type":"firestarter.listing","listing":{"id":"lst_Zm2X5enW","product_name":"Byzantium","category":"Ink Bottle","description":"GET ONE FREE bottle of Byzantium in the Tiger's Eye Ink Bundle.\nByzantium is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. The 50mL volume will provide approximately 62 standard converter refills assuming a 0.8mL draw. Our ink swatch is produced with a cotton swab on Tomoe River paper. We manufacture this ink in Pennsylvania with domestic and imported ingredients.","images":["https://cdn.shopify.com/s/files/1/1237/1088/files/Byzantium.jpg?v=1763748990","https://cdn.shopify.com/s/files/1/1237/1088/files/Byzantium_Macro_Writing_Sample.jpg?v=1763749006","https://cdn.shopify.com/s/files/1/1237/1088/files/Byzantium_Macro_Swatch.jpg?v=1763749015","https://cdn.shopify.com/s/files/1/1237/1088/files/Byzantium_Writing_Sample.jpg?v=1763749024","https://cdn.shopify.com/s/files/1/1237/1088/files/Ink_Bottle_Box.jpg?v=1774542507"],"price":17,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:18.167Z"},"share_url":"https://firestarter.network/l/lst_Zm2X5enW","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 ","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_Zm2X5enW' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Byzantium' and a budget_max comfortably above $17.00 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."]}}