{"type":"firestarter.listing","listing":{"id":"lst_6R5N_re_","product_name":"KZ AST","category":"Earphones/IEMs","description":"\n\n\n24 Units Top-Level Configuration\nAST adopts the 2nd generation High-frequency matrix BA combination designed and developed independently. The combination of 12 balanced armature units on one side and detailed acoustic adjustment significantly improves high-frequency performance, makes the human voice rich, soft, and not harsh, and the sound smooth and natural, bring a professional listening experience.\n\n\n\n\n\nStreamlined Surface Made of Zinc Alloy\nAST owns the precision of the ear shell ±0.03 which reaches the highest rigorous quality standard. The zinc alloy material is polished by five-axis CNC and polished by professional craftsmen, making the surface cover a streamlined curved surface and full of sense of technology.\n\n\n\n\n\nComfortable To Wear & Noise Reduction\nWith a smaller size and ergonomic design, AST is suitable for diversified wearing scenarios. The contour curve of the earphone conforms to the shape of the human ear cochlea, which can also greatly isolate the noise. It is matched with a soft silicone earplug and ear-hook design, which can be worn for a long time.\n\n\n\n\n\n4 Strands of 200-Core Silver-Plated Cable\nAST owns 4 strands of 200-core silver-plated professional earphone cable, retaining the sound of subtle changes, which is the symbol of every audiophile. The 0.75mm gold-plated pin insert and pull structure independently developed expands more usage ways to meet individual needs through replacement and upgrading of cables.\n\n\n\n\n\nOptional Colors &Mic\nAccording to a survey of mainstream colors in the earphone market, AST chooses three color schemes that are sophisticated in-depth to meet the needs of different groups of people. You can choose the mic version if you need it. Enjoy HiFi music as well as not missing any phone calls.\n\n\n\n\n\nNew upgrade of the new generation of BA\n-First Upgrade:\nThe new 30017s balanced armature combination make a rapid increase in medium and high frequency\n-Second Upgrade:\n\nNew type 30095s and 30019s balanced armature","images":["https://cdn.shopify.com/s/files/1/0040/7201/3924/products/08_600a30d8-3dac-4738-aeb9-0aae314eb537.jpg?v=1622083087","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/06_fad31992-034f-4773-947a-4904c365e750.jpg?v=1622083087","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/07_986982f3-fb7a-4e30-ba79-bb6c6e9f273e.jpg?v=1622083087","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/05_7a53e36f-9971-4096-b853-e1ea1a42f555.jpg?v=1622083087","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/04_9ec063cd-c3af-4d50-a7f0-8c1ee1e4477e.jpg?v=1621848532","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/6y_25844d4e-bd01-4515-a61c-ac3dd0bb0b61.jpg?v=1621848532","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/2y.jpg?v=1621848532","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/3y.jpg?v=1621848532","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/4y.jpg?v=1621848532","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/5y_a36406d7-3bd8-41cf-bdfd-9fdb8bd7d1ec.jpg?v=1621848532","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/7y_b03c5cb7-ef76-4a1f-97cd-c67fa428dc09.jpg?v=1621848532","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/02_89337ee1-79be-493d-a30f-4b6b70cec6f7.jpg?v=1621848532","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/03_1053ef2a-e013-4b3c-b10c-5a553859597a.jpg?v=1621848532","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/88bc45c5b2b0d0915a13131de97ec9ed.jpg?v=1621848544","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/d916241205efd8a780e2a4247e2e59e6.jpg?v=1621848545","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/c8af2a95a59bc97ee2ab5f40fe0701a5.jpg?v=1621848545","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/027e8f9a61b522f770447ae93fa2462a.jpg?v=1621848545","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/4527a4226266e22cc641cc2c432ec22a.jpg?v=1621848545","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/f7a420774efe4c0aca0514dcd716122a.jpg?v=1621848545"],"price":130,"currency":"USD","in_stock":true,"inventory_qty":59994,"dynamic_pricing":false,"listed_at":"2026-06-20T16:26:47.790Z"},"share_url":"https://firestarter.network/l/lst_6R5N_re_","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 ","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_6R5N_re_' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy KZ AST' and a budget_max comfortably above $130.00 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."]}}