{"type":"firestarter.listing","listing":{"id":"lst_aSl3CcZW","product_name":"Standard International Converter Schmidt K5","category":"Convertor","description":"Standard International converter from Schmidt. Model K5\n\"Standard International\" cartridges and converters are commonly used in most fountain pens.\nA fountain pen converter is a cartridge-shaped reservoir. Most modern fountain pens use a cartridge/converter filling system (c/c for short) that allows the writer to use bottled pen ink.\nThis converter is compatible with the below brands;\nBenu, Bexley, Caran d'Ache, Conklin, Edison, Esterbrook, Gioia, Faber-Castell, Franklin-Christoph, Graf von Faber-Castell, Kaweco (big sizes only), Laban, Leonardo Officina Italiana, LOCLEN, Montegrappa, Monteverde, Pelikan, Pineider, Porsche Design, Retro 1951, rOtring, S.T. Dupont, Taccia, TWSBI, Visconti, Waterford, Waterman, Ystudio \nAlso available in screwed K6 model here (Which is commonly used in custom pens)","images":["https://cdn.shopify.com/s/files/1/0575/7177/files/standard-international-converter-schmidt-k5.jpg?v=1683425248","https://cdn.shopify.com/s/files/1/0575/7177/files/standard-international-converter-schmidt-k5-2.jpg?v=1683425256","https://cdn.shopify.com/s/files/1/0575/7177/files/standard-international-converter-schmidt-k5-3.jpg?v=1683425264","https://cdn.shopify.com/s/files/1/0575/7177/files/standard-international-converter-schmidt-k5-4.jpg?v=1683425272"],"price":4,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:46:02.295Z"},"share_url":"https://firestarter.network/l/lst_aSl3CcZW","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_aSl3CcZW' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Standard International Converter Schmidt K5' and a budget_max comfortably above $4.00 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."]}}