How it works
Four steps, and you can stop and come back.
Each step depends on the one before it, and Marginary knows which ones you've finished. Progress counts items that can really be priced, not steps you clicked through. An item with no cost and no floor is never priced, however far you get.
Connect Amazon
You grant permission to read your prices and, later, to change them. Marginary uses Amazon's Selling Partner API, so nothing depends on your password and you can revoke it from your Amazon account at any time.
Get your items
Pull your catalogue straight from Amazon, upload a CSV, or paste a block of spreadsheet cells in. The upload previews what it recognised, what it will create, and every bad row by row number — and writes nothing until you confirm. One unusable line does not fail the other forty-nine.
Imported items arrive paused. Run the pull twice and it updates rather than duplicating.
Tell us your costs
What you paid, shipping in, anything else. This is what makes the floor mean something. There's a spreadsheet-style grid for typing costs across hundreds of items — keyboard driven, and nothing saves until you save.
Your minimum can be a number, or a rule: keep at least 15% return on cost. Written as a rule, it stays correct when a fee changes instead of going stale.
Pick how to price
Start with Profit maximiser. It optimises inside your range, backs off when Amazon holds the Featured Offer, holds in a price war, and raises prices when you're running low on stock.
If you'd rather write rules, you can — a named, ordered list where the first match wins, with the plain-English description generated from the rule itself so it cannot drift from the behaviour. Or run rules first and hand anything they don't answer to the optimiser.
That is the last step. Pricing runs from then on, as often as you choose — every five minutes through to once a day — and only on the items you have finished. Setup tells you which those are, and why the rest are not.
147 items ready to price
32 are not: 29 have no cost, 3 have no minimum price. Those stay exactly where they are.
Cut the price from $24.99 to $23.45 after the best rival offer undercut you to $23.40. Matching the lowest offer would have earned $0.62 less per day.
Safety
Two limits you can't turn off. Eight you set yourself.
All of them apply to everything — your own rules, our optimiser, and manual changes alike.
Your price never leaves your range
Not by a rule, not by the optimiser, not by accident.
An item with no cost basis is never priced
Checked before every single decision, not once at import.
Biggest jump in one change
As a percentage, a dollar amount, or both. The smaller one wins.
Changes per item per day
So your listing doesn't look unstable to buyers.
Changes across your whole shop per hour
One cap on everything, so nothing runs away.
Smallest change worth making
Pointless one-cent moves get skipped.
Price endings
Round to .99, .95 or .00. Always down, never up.
Price-war brake
When prices on a listing keep falling fast, Marginary stops following them down.
Wait while Amazon is selling
Amazon usually wins on price. Sitting still beats losing money.
Emergency stop
One button freezes every price where it is. Marginary keeps recording what it would have done, so you lose nothing by pressing it.
Straight answers
What it can't do, before you find out yourself.
Every repricer page promises the same six things. These are the edges of this one.
It is not real-time
The scheduler ticks every 30 seconds; the fastest cadence you can pick is five minutes. Rival movements are reported as minutes or hours ago, because that's the cadence.
Amazon only
US, Canada, UK and Germany. Walmart and eBay are not available.
Imports are capped
2,000 rows per CSV, and a catalogue pull stops at 500 items per run. Run it again for the rest.
It's statistics, not AI
A logistic model with calibration and a least-squares fit for demand. It's told you when it hasn't seen enough of a listing to be confident.
Replay has a limit
It can tell you what a strategy would have chosen in recorded conditions. It cannot tell you how your competitors would have reacted.
Some numbers are modelled
Profit per day mixes observed Amazon orders with modelled estimates, and says which is which. Featured Offer share is always measured.
Start at step one. Stop whenever you like.
Fourteen days free on Starter, and an emergency stop from the first hour.