{"type":"firestarter.listing","listing":{"id":"lst_Z6zXcMI6","product_name":"Fountain Pen Cartridges","category":"Ink","description":"\nFranklin-Christoph Fountain Pen Cartridges\n\n\nThe ink formulas used in our corresponding ink bottles for these colors are the same in the cartridges. \nThese are considered \"international short standard\" cartridges and fit in many styles and brands of fountain pens including all Franklin-Christoph models. \nSold in tins with 10 carts included in each. What we affectionately call these our \"Ten Tins.\" \n\n","images":["https://cdn.shopify.com/s/files/1/0023/7679/4187/products/20190319_144811-01-01.jpeg?v=1559154069","https://cdn.shopify.com/s/files/1/0023/7679/4187/products/20190319_144607-03.jpeg?v=1559154072","https://cdn.shopify.com/s/files/1/0023/7679/4187/products/20190319_134234-01.jpeg?v=1559154077","https://cdn.shopify.com/s/files/1/0023/7679/4187/products/20190319_133225-01-01.jpeg?v=1559154080"],"price":4.95,"currency":"USD","in_stock":true,"inventory_qty":59994,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:20.951Z"},"share_url":"https://firestarter.network/l/lst_Z6zXcMI6","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_Z6zXcMI6' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Fountain Pen Cartridges' and a budget_max comfortably above $4.95 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."]}}