Cross-Marketplace Price Comparison

One tool call queries every installed searchable marketplace concurrently and returns a single price-ranked list. Use it instead of calling each marketplace's search tool in sequence: same data, one round trip, plus the ranking and the spread. Offers are de-duplicated on (source, product id), so one listing can't hold two ranking slots. Taobao is in the fan-out too, and it prices in yuan — see the note below before you rank its rows against rouble sources.

When to use

• "Где дешевле купить X?" — the canonical case
• Deciding between marketplaces before a purchase
• Establishing a market price range for a product category
• Checking whether one marketplace is overcharging

When NOT to use