An agent that audits your Walmart Fulfillment Services charges — dimensions, pick & pack tiers, prep fees, storage, inventory — and turns every mismatch into a documented dispute. WFS fees are computed from measurements; when the measurements are wrong, you pay for it on every order.
For: Walmart WFS sellersWalmart WFS↗ Every fee, verified
The workflow
How the agent runs
1
Verify dimensions first
WFS fulfillment fees are tiered by size and weight. The agent compares Walmart's recorded dimensions for your items against your actuals — a wrong tier is a wrong fee on every order, forever, until someone disputes it.
2
Audit pick, pack & prep
Every fulfillment fee line is checked against the tier it should be in, and prep/label charges are matched against prep actually performed.
3
Reconcile the inventory
Inbound shipped vs received, units lost or damaged inside WFS facilities, returns that never restocked — every unit accounted for or disputed.
4
Check storage & returns charges
Storage is billed from volume, so dimension errors cascade here too. Return handling and return-shipping charges get verified against what actually came back.
5
File & follow disputes
Each discrepancy becomes a dispute pack: report lines, correct measurements, the fee math. Filed disputes are tracked to resolution; denied ones get re-filed with better evidence.
A 10.2-inch item recorded as 12 inches jumps a fulfillment tier. At a few thousand orders a month, that single measurement error is a four-figure annual overcharge — invisible unless somebody reconciles the fee table against a tape measure. This agent is that somebody.
Run this agent yourself
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1 · Bring your account reports
This agent's source of truth is your own account data — the inventory, shipment, returns and fee reports from Seller Central (or Walmart Seller Center). Export them — or integrate with the marketplace APIs directly (Amazon SP-API, Walmart Marketplace API): the LLM you're using can write that integration with you, and then the reports pull themselves on schedule. No public crawl can see them; they're behind your login, as they should be.
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2 · Optional: link the FreshCrawl MCP
Add the FreshCrawl MCP connector — server crawl.onewally.com/mcp — and the agent can cross-check what your public listing pages state (dimensions, weight, current price) against your reports. Supporting evidence only: disputes rest on your measured actuals and your report lines.
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3 · Paste the prompt
Copy the prompt below, attach your reports, name your store. The agent reconciles everything and hands you the claim file — no code.
Copy the prompt
Starter prompt
Step 3 · Paste this into your LLM
# WFS Fee & Inventory Auditor
MY STORE (fill in once):
- Store name: [your store name]
- Seller ID or storefront URL: [paste it — the agent uses it to find your catalog]
- Marketplace: [Walmart US / Amazon US]
First, use the FreshCrawl MCP to look up my store, pull my catalog,
and work only on my listings. If you can't identify my store from
what I gave you, ask me for my storefront URL before anything else.
RUN SCHEDULE (set this where you run the prompt):
- Run this prompt: weekly fee sweep Mondays 6:30 AM, plus a monthly deep audit on the 1st.
- If your LLM app supports scheduled/recurring tasks, set it there; otherwise re-paste the prompt on that cadence.
DATA SOURCES: my own Seller Center reports are the source of truth. Feed them to you two ways: (a) I attach the exports, or (b) we integrate with the Walmart Marketplace API directly — if no integration exists yet, write it with me first, then pull the reports yourself on schedule. Use the FreshCrawl MCP, if connected, only to cross-check what my public listing pages state (dimensions, weight, current price) — disputes rest on my measured actuals and my report lines, never on the crawl alone.
Audit my Walmart WFS account (I'll attach the Seller Center exports or connect my account) and check all nine categories:
1. Dimension/weight mismatches: Walmart's recorded dims vs my actuals — wrong tier = wrong fulfillment fee on every order.
2. Pick & pack fee errors: charges in the wrong size/weight tier.
3. Prep & labeling fees: charged for prep not performed, or the wrong prep service.
4. Storage fee errors (volume-based — dimension mistakes cascade here).
5. Inbound discrepancies: units shipped vs received.
6. Inventory lost or damaged inside WFS facilities.
7. Returns: units returned but never restocked; return handling/shipping fees misapplied.
8. Peak/aged-inventory surcharges applied outside their terms.
9. Performance or SLA debits caused by WFS-side errors, charged to me.
For every discrepancy: amount, evidence (report + line), the correct fee math, and a drafted dispute in Seller Center format. Sort the dispute file by dollars, biggest first.
EXECUTION — READ CAREFULLY:
You find and document discrepancies and draft disputes. Never invent a quantity or a dollar figure — every dispute must cite the exact report and line it came from. Where I have connected my account so you can file, file only disputes of $25 or more; draft everything else for my approval. Walmart decides every dispute: write 'disputable', never 'owed'.
The prompt gets you the shape. The reliable version runs on live data through the MCP — that's steps 1 and 2 above.
Prices every lost Buy Box in dollars and ranks the fixes worst-first.
Questions sellers ask
Why dimensions first?
Because WFS fulfillment and storage fees are both computed from size and weight tiers. One wrong measurement doesn't cost you once — it taxes every order and every storage bill until it's corrected and disputed.
What else does it catch besides fees?
Inbound shortages, inventory lost or damaged in WFS facilities, returns that never restocked, misapplied return fees, out-of-terms peak surcharges, and SLA debits caused by Walmart-side errors.
Does it file the disputes itself?
It builds each dispute pack complete: report lines, your true measurements, the corrected math. If you connect your account for filing, it files disputes above the floor you set ($25 default) and drafts the rest for approval. Walmart decides each dispute, so the agent says 'disputable', never 'owed'.
How is this different from the FBA agent?
Same discipline, different building: different fee tables, different reports, different dispute system. Sellers on both channels run both — the claim categories rhyme, the evidence never transfers.
Run this on your store.
Every agent here runs on live FreshCrawl data through the MCP. Start free, connect your LLM, paste the prompt — or get the free Buy Box Loss Report and see the data first.