{"type":"firestarter.listing","listing":{"id":"lst_OUDIhTKn","product_name":"Solstice Black","category":"Tennis String","description":"Diadem Solstice Black is a new generation of a comfortable soft co-poly with a six-pointed star shape. Similar to our Solstice Power flagship string, Solstice Black due to its black pigment will play softer. Also with our improved extrusion process you will find better tension maintenance than with is predecessor. The result is a string that combines a low-friction surface with maximum ball bite. In other words, this string was built for spin - massive spin. Beginner, intermediate and advanced players looking for a comfortable co-poly with pinpoint control have come to the right place.\n \n   Actual Cross Section\n\n \n\nLength: 40 feet / 12.2m\nColor: Black\nGauges Available\n\n18 (1.15mm) Best feel\n\n17 (1.20mm)\n16L (1.25mm)\n16 (1.30mm)\n15L (1.35mm) Most durable\n\n\n\n","images":["https://cdn.shopify.com/s/files/1/0253/6210/4402/files/Solstice_black_combined.jpg?v=1762441889"],"price":13.95,"currency":"USD","in_stock":true,"inventory_qty":49995,"dynamic_pricing":false,"listed_at":"2026-06-20T14:55:57.896Z"},"share_url":"https://firestarter.network/l/lst_OUDIhTKn","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_OUDIhTKn' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Solstice Black' and a budget_max comfortably above $13.95 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."]}}