Your margin starts at landed cost, not at the listing price
If you buy to resell, the number that decides the trade is what a unit costs you delivered. We record that number, keep its history, and tell your team when it moves.
The cost basis you actually have
Margin arithmetic done against the listing price is arithmetic against a number you never paid. A unit costs you the base price, plus what it took to ship, plus whatever the destination charged to let it in. That sum is your cost basis, and it is the one we store.
Because the three components are kept apart as well as added up, you can see which one is eating the trade. A supplier holding price while shipping creeps upward is a different problem from a supplier raising price, and it calls for a different response.
Per product and per country the record carries the lowest, highest and average landed cost, the day each extreme happened, and how long the product has been under observation. A margin that only works at the all-time low is not a margin.
Availability is a supply signal
For a reseller, a listing going out of stock is information about supply, and a listing coming back is a window. Both directions can be alerted on separately, and both are recorded whether or not you asked to be told.
Availability is genuinely intermittent, and the record says so. Each country's record carries the share of checks that found the product available, and a check that could not read a price is stored with its reason: a blocked check, a hidden price, or an item not purchasable from that destination.
A price that disappears and comes back lower is still a price change here. The record reaches back past the unavailable stretch to the last genuine price, so a restock at a new number is not swallowed by the gap.
Tell the team, not just yourself
Alerts go to email, Slack, Telegram or WhatsApp. Slack is usually the right answer for a team, because the message lands in the channel where someone is already deciding and nobody has to forward a screenshot.
One alert can reach several recipients at once, and each is dispatched independently, so a failing channel does not silence the others. Every recipient is verified before anything is sent to it: a link for email, a six-digit code for WhatsApp and Telegram, and for Slack a real test message that either arrives or the recipient is refused on the spot.
When a message does not arrive, you can find out why. Every delivery leaves a trace with the provider, the status code it returned and how long it took. That is visible to you, not only to us.
The boundary of what this is
This is a landed-cost tracker, not a sourcing suite. There is no sales-rank or review tracking, no Buy Box or competitor intelligence, no keyword or category monitoring, and no bulk export.
There is also no buying. We do not add to cart, do not check out, do not route you through an affiliate link, and take no cut of anything you purchase. We read a public product page and record what it said.
If your workflow needs rank history and Buy Box share, you need a different category of tool, possibly alongside this one.
Coverage, and what it costs to watch
Three marketplaces: Bolivia, Peru and the United States. That is the whole of the coverage, and it is worth checking against your lanes before you plan around it. Countries that are switched off are refused outright, before a credit moves.
One credit watches one product in one marketplace for thirty days. A second destination is a second credit, so a hundred products across two destinations is two hundred credits a month. The arithmetic is deliberately boring, which is what makes it possible to budget.
Credits you purchase are valid for thirty days from the purchase, the same span as one tracking period. That makes buying ahead for a whole quarter a poor idea and buying for the month you are actually working a sound one. Credits are not returned when you stop tracking.