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Commerce intelligence for marketplaces
On a marketplace the interesting entity is not the product, it is the seller behind the current offer. Buy-box ownership changes hands hourly, and the price attached to a listing may belong to a reseller you have never heard of.
Marketplaces
Seller identity on every offer
Each offer carries who is actually selling it. A price of $14.99 from a third-party reseller is a different fact from $14.99 sold by the marketplace itself, and conflating them corrupts every downstream decision.
Marketplaces
Buy-box flips as a signal
seller.changed is a leading indicator of a channel problem: an unauthorised reseller taking the box, or a distributor liquidating. It usually fires before the price move that makes it obvious.
Marketplaces
Cross-marketplace gaps
The same unit listed on two marketplaces at different prices is either an arbitrage or a mispricing. Spread is computed on landed cost, because shipping is where most apparent gaps evaporate.
Endpoints that do this
Where it lands in the API.
Offers
Every live offer for a product, with seller identity, landed cost, condition and the provenance of each value.
Events
Six event types, signed on delivery and replayable by cursor. Every consumer eventually needs to backfill a gap.
Compare
One product across every seller that carries it, ranked by landed cost, with the spread. Server-side work is worth more than four raw reads the caller has to join.
Questions
Common questions.
Can it distinguish first-party from third-party offers?
Yes — seller identity and offer type are carried separately, so first-party, marketplace and refurbished offers are never pooled into one number.