Check a requested quantity against public variant constraints and known availability. Unknown stock remains unknown; this capability never reserves or purchases inventory.
Cheaply detect material public product changes in price, availability, selected variant or seller using a deterministic hash. Timestamps, images and analytics noise are excluded.
Return seller identity and publicly published seller signals for a marketplace listing. Missing feedback or business fields remain null; no customer or seller account access is attempted.
Normalize public marketplace listing activity, offer, seller, condition and quantity hints. eBay credentials are optional configuration; no buying, bidding or seller mutation is supported.
Return a normalized current offer price for a public product or listing. Provider fields missing from the source remain null; no price prediction, purchase or customer authentication is performed.
Resolve public product or listing availability with explicit normalized states. It reports only provider evidence and never infers inventory, reserves items or places an order.
Resolve requested product options to a canonical public variant when the provider exposes them. Ambiguous or missing options are reported explicitly; no checkout or cart mutation occurs.