Who held your buy box, and when.
One call returns the observed buy-box owner timeline for an ASIN, the price each seller was charging, and every current offer with seller IDs. The data layer for MAP and brand-protection monitoring — built for teams who want to run their own.
- ✓Buy-box owner segments with the seller on each
- ✓Per-seller price series, with seller IDs and feedback
- ✓Every current offer, FBA/FBM and buy-box flagged
- ✓Days each seller actually held the buy box
- ✓BSR rank history alongside it, since Oct 2023
- ✓One call per ASIN — 2 credits, cached under 100 ms
What it answers.
- Did an unauthorised seller take my buy box? Segments name the seller that held it and the window they held it for, so you can see a takeover rather than infer it from a single snapshot.
- How long did they hold it? Each segment carries the days we actually observed that seller in the buy box — not an estimate.
- Did my price move when they took it? The per-seller price series runs alongside, so you can line up a buy-box loss with what each seller was charging that day.
- Who else is on the listing right now? Every current offer with seller ID, feedback percentage, FBA/FBM and buy-box flag.
Look up an ASIN. Open the detail.
Hit Full price, rank & seller history on any result. The buy-box owner timeline is the first block — on many ASINs you can watch the listing change hands and change back.
How it compares.
| Logimu | Keepa | Live-scrape APIs | Proxy / scraper stacks | |
|---|---|---|---|---|
| Buy-box owner history | First-class field, 2 credits per ASIN, no subscription | Yes, on paid plans — derived from the offers object | Not available | Only if you collected it yourself |
| Per-seller price series | Included | Limited | Not available | Build it yourself |
| History reaches | Dec 2024 (US buy box) | 5–10+ years | None — live scrape only | Starts the day you start |
| Brand-protection tooling | Data layer only — you build the monitoring | None marketed | None | None |
| Pricing model | Prepaid credits, never expire | Monthly token buckets | Per request | Per request + proxies |
| Typical monthly cost, 500 ASINs daily | about $8 | €49+ tier | n/a | n/a |
What this is not.
This is a data API, not a takedown service. It tells you what happened on your listings; it does not file complaints, contact sellers, or enforce anything. If you want monitoring run for you — alerts, dashboards, unauthorised-seller tracking — that is a product, not an endpoint, and it is priced accordingly across the market.
Two honest limits. Buy-box segments span the days we observed — a gap between segments is unobserved time, not proof the owner changed. And depth is per marketplace: US buy-box reaches December 2024, full multi-seller coverage August 2025, other marketplaces from when tracking began there.
Start with 2,500 free credits.
That is roughly 1,250 ASIN lookups with full buy-box and seller history. No card.
Get your API key