Switching Repricers without a Gap: PricingMag’s Zero-Downtime Sequence 

Changing repricing tools is not difficult. The handover is. There are exactly three ways it goes wrong, and all three are avoidable with a sequence rather than a decision. 

Gap: the old tool is off, the new one is not yet governing, and your prices sit frozen while the market moves around them. 

Overlap: both tools are live, submitting conflicting prices on the same SKUs, and your prices oscillate until someone works out why. 

Bad inheritance: the new tool goes live with floors imported wrong — mis-mapped columns, stale values, or minimums that silently defaulted to something you did not choose. 

The third is the expensive one, because it does not look like a failure. It looks like automation working, at prices you never authorised. 

Here is the sequence that avoids all three. 

Phase 1: Export Everything Before You Touch Anything 

Before the new tool is even connected, capture the current state. You will need it for verification, and possibly for rollback. 

Export, as files you keep: 

• Current prices for every SKU 

• Current minimum and maximum prices for every SKU 

• Your rule definitions — not just names, the actual logic: what each rule competes against, by how much, which competitors are excluded, whether upward movement is enabled, and which SKUs are attached to which rule 

• Price history, as far back as the old tool will give you. This is the asset you lose permanently when you cancel, and the one people forget. 

Rule definitions are rarely exportable cleanly, so screenshot them. It is unglamorous and it takes twenty minutes, and reconstructing a year of accumulated rule logic from memory takes considerably longer. 

Phase 2: Audit the Floors Before They Migrate 

This is the step that turns a tool change into an improvement, and skipping it is how sellers carry a problem from one system to the next. 

Your minimum prices are about to be imported into a new system that will act on them immediately. If they are wrong now, they will be wrong there — but faster, and with you less likely to notice because you will attribute any oddity to the new tool. 

Verify against current inputs: current referral percentage, current fulfilment fee including the 3.5% fuel and logistics surcharge applied to FBA fulfilment fees in the US and Canada from April 2026, allocated storage, per-SKU returns, and landed cost including freight and duty. Floors built before Amazon’s 2026 fee changes — effective for most sellers on 15 January 2026 — are understated. 

Migrate corrected floors, not historical ones. A switch is the cheapest moment you will ever have to fix your cost model, because you are touching every SKU anyway. 

Phase 3: Connect the New Tool in Monitor Mode 

Most repricing tools can connect and observe without submitting prices. Use it. 

Connect, import your catalogue, import your corrected floors, and configure your rules — then leave it watching for two to three days without authority to act. 

What you are checking: 

• Does the catalogue match? SKU counts, variations, inactive listings. Missing SKUs now are missing coverage later. 

• Did the floors land correctly? Spot-check twenty SKUs against your export. Column mis-mapping is the single most common import failure, and it is silent. 

• Do the rules behave as intended? Many tools show the price they *would* have set. Compare those against your current prices and ask whether you agree. Disagreements here are configuration misunderstandings, and finding them in monitor mode costs nothing. 

• Is the connection authorised, not just connected? A connection showing as present while the underlying authorisation has lapsed is how coverage quietly stops. 

Phase 4: Hand Over in One Direction, in Batches 

The order matters and it is counter-intuitive: turn the old tool off for a batch of SKUs before you turn the new one on fo r them. 

Why that way round rather than overlapping: a brief gap is harmless. Prices sit still for a few minutes. Overlap is not harmless — two systems submitting different prices for the same SKU produces oscillation, confuses both tools’ logic, and can look like a price-bouncing fault that takes days to attribute correctly. 

So, per batch: 

1. Remove the batch from the old tool’s rules
2. Confirm removal — check that the SKUs are genuinely unattached, not just paused
3. Enable the batch in the new tool
4. Watch for one full cycle before starting the next batch

Start with a batch of 10 to 20 SKUs on contested ASINs where you will see movement quickly. If that batch behaves, proceed in larger batches. If it does not, you have a problem confined to twenty SKUs. 

Phase 5: Verify, Then Cancel 

Do not cancel the old subscription on the day the handover finishes. Keep it for one billing cycle, dormant, as your rollback path. 

Before cancelling, verify: 

• No SKU is attached to rules in both tools 

• No SKU is attached to rules in neither — this is the gap that hides for weeks, and the way to find it is to compare your new tool’s governed SKU count against your active listing count 

• Floors in the new tool match your corrected export 

• Prices moved at least once per SKU group, confirming the new tool has real authority 

• You have downloaded any price history you want to keep 

Then cancel, and keep your exports. 

The Two Mistakes That Persist Past the Switch 

Mistake one: importing the old configuration faithfully. A switch is an opportunity to fix what was wrong, and most sellers’ old configuration contains at least one known issue — a reference set to the lowest offer, no upward movement, one rule covering SKUs with different economics. Carrying it across verbatim means paying a new subscription to reproduce an old problem. 

Mistake two: assuming equivalent settings mean equivalent behaviour. Tools define their references differently, calculate competitive prices differently, and respond at different speeds. A rule named the same thing in two systems is not the same rule. This is exactly what monitor mode is for. 

The research team at PricingMag has written up the full handover for sellers who need to switch repricers without a gap in coverage, including the verification checklist and the floor audit that should happen mid-migration. 

The tool change is a Tuesday afternoon. The export, the floor audit and the batch handover are what make it a Tuesday afternoon rather than a fortnight.