{"type":"firestarter.listing","listing":{"id":"lst_bnVtqMFJ","product_name":"Voltaic Arc","category":"Ink Bottle","description":"Voltaic is a vivid dark blue to blue-black that sparks with a rich merlot sheen in saturation for an alternating current of a finish.\n*Fountain pen ink sheen properties are best expressed when the ink is saturated on slightly hydrophobic papers like Tomoe River or Rhodia. Get the best results with a wet line.  Visible coloring will vary drastically by paper type and saturation.\nPart of the Keystone Formula fountain pen ink line, Voltaic Arc is built with traditional water-soluble dye colorants. Our ink color swatch is produced with a cotton swab on Tomoe River paper and writing sample with a German medium nib. The 50mL volume will provide approximately 62 standard converter refills assuming a 0.8mL draw. Glass bottles arrive prepared in our beautifully foiled Birmingham Pen Co. gift box.","images":["https://cdn.shopify.com/s/files/1/1237/1088/files/Voltaic_Arc_hiRes.jpg?v=1737127386","https://cdn.shopify.com/s/files/1/1237/1088/files/InkBottleBox60mL_bf2ea868-1c13-45cc-b85e-3bcb5f6a3bbf.jpg?v=1737127386","https://cdn.shopify.com/s/files/1/1237/1088/products/VoltaicArcWritingSample68gsmTomoe.jpg?v=1737127386"],"price":17,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:18.710Z"},"share_url":"https://firestarter.network/l/lst_bnVtqMFJ","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_bnVtqMFJ' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Voltaic Arc' 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."]}}