{"type":"firestarter.listing","listing":{"id":"lst_pySh_u3B","product_name":"Ink Converter Set","category":"Ink Converter","description":"A converter functions as the ink reservoir within a fountain pen, operating with a twisting plunger mechanism to draw fluid for storage in the cylinder. The receiver fits a standard international-sized nozzle which is by far the most common size, compatible with a variety of fountain pens. Every Birmingham Pen Co. fountain pen includes one converter, but it's common to hold extra on hand. \nEach set includes two (2) separate ink converters. The cylinder will draw approximately 0.8mL of ink per fill. This converter is currently compatible with all Birmingham Pen Co. fountain pens. ","images":["https://cdn.shopify.com/s/files/1/1237/1088/products/German-K5-Ink-Converter_900x-cut.jpg?v=1564498003"],"price":10,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:18.774Z"},"share_url":"https://firestarter.network/l/lst_pySh_u3B","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_pySh_u3B' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Ink Converter Set' and a budget_max comfortably above $10.00 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."]}}