{"type":"firestarter.listing","listing":{"id":"lst_OPsz7DNp","product_name":"Ring Sizer","category":"Rings","description":"Not sure about your ring size? No worries, we got you! Precisely measure sizes 1 to 17 with our Ring Sizer. Here is how. And if you need more tips on finding the perfect ring size, or need a conversion chart for mm size, check out our blog post!\nEach ring sizer also comes with a sizing card to help you determine what size you need for piercings, hoops, nose rings, septums, and ring band widths.\n*Please note the ring sizer only measures whole and half sizes, not quarter sizes.\n ","images":["https://cdn.shopify.com/s/files/1/2065/2103/files/ring-sizer-tool-black-gold_1.jpg?v=1701479758","https://cdn.shopify.com/s/files/1/2065/2103/files/automic-gold-ring-sizer-black.jpg?v=1701479758","https://cdn.shopify.com/s/files/1/2065/2103/files/black-gold-ring-sizing-tool_1.jpg?v=1701479758","https://cdn.shopify.com/s/files/1/2065/2103/files/black-and-gold-ring-sizer_1.jpg?v=1701479758","https://cdn.shopify.com/s/files/1/2065/2103/products/size-chart-measurements.jpg?v=1701479758"],"price":3,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:45:44.136Z"},"share_url":"https://firestarter.network/l/lst_OPsz7DNp","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_OPsz7DNp' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Ring Sizer' and a budget_max comfortably above $3.00 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."]}}