Show HN: KaliCart – an agent-readable catalog for WooCommerce (no API key) KaliCart Bridge, a free WooCommerce plugin, makes product catalogs machine-readable for AI shopping agents without requiring an API key or cloud service. It exposes structured REST endpoints and discovery signals, enabling agents to filter by attributes like color and stock with high accuracy, as demonstrated in a blind test. The plugin also supports federated catalog search via KaliCart Global and UCP interoperability for agents like ChatGPT and Copilot. Free WooCommerce plugin that makes your product catalog machine-readable for AI shopping agents. ARC/1.0 reference implementation · No LLM · No cloud · No API key When an AI shopping agent visits a WooCommerce store today, its default behavior is to fetch the storefront HTML and scrape product data from it. This is the wrong approach — and in a documented blind test on a live store, the cost was measurable: | Approach | API calls | Payload | Stock accuracy | Color filtering | |---|---|---|---|---| | HTML scraping | 5–6 | ~400 KB | High dropdowns show real variants | Manual, from text | WordPress REST wp/v2/product | 2 | ~77 KB truncated | Low — class list reports defined sizes, not in-stock ones | None | KaliCart Bridge ARC/1.0 | 2 | ~4–5 KB ≈10 KB incl. discovery | High — per-variant quantity with confidence level | Native color= filter | Blind test: finding a dark-colored women's two-piece swimsuit, size S, under €150, on a live WooCommerce store. The agent was given no hints. It scraped HTML first, then tried the generic WordPress REST API which produced a false positive on stock , and found the structured kalicart/v1 catalog only when explicitly pointed at it — even though that namespace was reachable from /wp-json the whole time. See BENCHMARK.md /giuseppesocci-bot/kalicart-bridge/blob/main/BENCHMARK.md for the full run, including honest caveats n=1, discovery cost . The signal to do better has always been there. Every WordPress site already emits