Replace InventoryLab and Sellerboard with your own e-commerce bookkeeping app
An Amazon seller cancelled InventoryLab and Sellerboard and built his own bookkeeping software with Claude, mostly with Opus 4.5 and polished with Opus 5.5. It tracks Amazon, Walmart and eBay sales, refunds, reimbursements, expenses, shipping, inventory and cash flow, and creates his FBA and WFS shipments.
Source
@pmcommerce on X · 2026-10-12
Written in our own words. Credit to the original author. Link checked 2026-10-21.
What they did
An Amazon seller cancelled InventoryLab and Sellerboard and built his own bookkeeping software with Claude, mostly with Opus 4.5 and polished with Opus 5.5. It tracks Amazon, Walmart and eBay sales, refunds, reimbursements, expenses, shipping, inventory and cash flow, and creates his FBA and WFS shipments.
Result (as claimed)
Two subscriptions cancelled; when something breaks, Claude fixes it the same day instead of waiting weeks for a vendor.
Tools they used
Cost: Claude Opus 5.5: from $4 in / $20 out per 1M tokens.
Set it up
Gather the documents
Collect statements, bills, invoices or tax documents for the period you want reviewed.
Ask for an audit, not actions
Have Claude list findings, amounts and suggested next steps before it does anything.
Approve each action
Approve cancellations, disputes or payments one at a time. Never give an agent open-ended access to move money.
Track the result
Record what changed and what you saved so you can check it next month. This is not financial advice.
Copy the full setup prompt
Paste into your agent and it will walk you through the setup, asking before anything that sends, posts or spends.
You are helping me set up this AI use case end to end in Claude Code. Goal: Replace InventoryLab and Sellerboard with your own e-commerce bookkeeping app What the original author did: An Amazon seller cancelled InventoryLab and Sellerboard and built his own bookkeeping software with Claude, mostly with Opus 4.5 and polished with Opus 5.5. It tracks Amazon, Walmart and eBay sales, refunds, reimbursements, expenses, shipping, inventory and cash flow, and creates his FBA and WFS shipments. Reported result (as claimed by the author): Two subscriptions cancelled; when something breaks, Claude fixes it the same day instead of waiting weeks for a vendor. Source: https://x.com/pmcommerce/status/2109435502856384695 Tools they used: Claude, Claude Opus 5.5, Amazon, Walmart, eBay Category: Money Please: 1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like). 2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure. 3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data. 4. Finish with a checklist to run it again next time.
You are helping me set up this AI use case end to end in Codex. Goal: Replace InventoryLab and Sellerboard with your own e-commerce bookkeeping app What the original author did: An Amazon seller cancelled InventoryLab and Sellerboard and built his own bookkeeping software with Claude, mostly with Opus 4.5 and polished with Opus 5.5. It tracks Amazon, Walmart and eBay sales, refunds, reimbursements, expenses, shipping, inventory and cash flow, and creates his FBA and WFS shipments. Reported result (as claimed by the author): Two subscriptions cancelled; when something breaks, Claude fixes it the same day instead of waiting weeks for a vendor. Source: https://x.com/pmcommerce/status/2109435502856384695 Tools they used: Claude, Claude Opus 5.5, Amazon, Walmart, eBay Category: Money Please: 1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like). 2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure. 3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data. 4. Finish with a checklist to run it again next time.
You are helping me set up this AI use case end to end in Grok Bot. Goal: Replace InventoryLab and Sellerboard with your own e-commerce bookkeeping app What the original author did: An Amazon seller cancelled InventoryLab and Sellerboard and built his own bookkeeping software with Claude, mostly with Opus 4.5 and polished with Opus 5.5. It tracks Amazon, Walmart and eBay sales, refunds, reimbursements, expenses, shipping, inventory and cash flow, and creates his FBA and WFS shipments. Reported result (as claimed by the author): Two subscriptions cancelled; when something breaks, Claude fixes it the same day instead of waiting weeks for a vendor. Source: https://x.com/pmcommerce/status/2109435502856384695 Tools they used: Claude, Claude Opus 5.5, Amazon, Walmart, eBay Category: Money Please: 1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like). 2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure. 3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data. 4. Finish with a checklist to run it again next time.
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Guides for this use case
How to build your own invoicing and bookkeeping app with AI ยท How to use AI agents for taxes, bills and budgets
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