Market Category Booster

Map a free-text product description to a marketplace category path. Walks the taxonomy of the target marketplace one level at a time and returns the full path: one match per level, from the broadest category down to the most specific one, each with the reason it was picked. Use it to assign a listing category to a product you only have prose for. The last match carries `truncated: true` when the per-request token budget stopped the descent before a leaf. Every successful call is billed: with no `X-API-Key` header and no x402 payment proof the tool answers with the payment requirements instead of a result.

List the marketplaces whose taxonomies are loaded, as `store_id` values. These are the only accepted values for the `store_id` argument of `categorize_product`. Free of charge on purpose: without it an agent would have to pay for a failed call to discover them.

Return the x402 payment requirements for one categorization call. Meant for an agent that holds no API key: gives network, asset, recipient address and amount as JSON, so the payment authorization can be signed before calling `categorize_product`. Free of charge.