Stop renting your own data back.

Add up what a mid-size Amazon seller pays for tools in a year. An analytics suite, a repricer, a PPC platform, a keyword tracker, a reporting add-on — each somewhere between $50 and $300 a month, each on its own tier ladder, each charging more as your revenue grows. It's common to cross $500–$1,000/month before anyone notices, and the bill scales with success, not with cost.

Now look at what those tools actually do. Almost all of them pull data from APIs Amazon already gives you — SP-API for orders, inventory and finances; the Ads API for campaigns and search terms — store it in a database, and put a UI on top. The data is yours. The APIs are free. What you're renting, at SaaS margins, is plumbing. And when you cancel, the plumbing keeps your history.

The data tax

The per-month price is only the visible cost. The structural costs compound quietly:

• Tier hostage-taking. The feature you need next is always one tier up. Per-SKU and per-revenue pricing means your tools get a percentage of your growth.
• Fragmentation. Five tools means five partial copies of your business, none of which can answer a question that spans two of them.
• Lock-in by history. Two years of data inside a tool is two years of leverage the tool has over you at renewal time.

What "build your own" actually takes in 2026

Five years ago, building your own stack meant a dev team and a product roadmap, because the expensive part was the interface — the dashboards, filters and report builders. That part is now free: Claude is the interface. What's left to build is honest infrastructure:

1. Ingestion — scheduled pulls from SP-API and the Ads API into your own warehouse (BigQuery or Postgres). This is settled, boring engineering.
2. A command center — an MCP server exposing your data and your levers as tools Claude can call. Ask anything, cross-system, in plain language; no report builder required.
3. Rules — the automations you'd otherwise rent: negation, bid maintenance, budget guards, dayparting.

The running cost of that stack is a small VPS and warehouse pennies — single-digit dollars a month for most catalogs. Built once, it's an asset: your data in your warehouse, queryable by you, forever, with no renewal negotiation.

When buying is still right

Honesty clause: some tools earn their rent. Repricing against the Buy Box needs real-time infrastructure that's genuinely hard to run — we know because we built and operate RepriceLab, and the always-on price war machinery is the product. Anything adversarial and real-time, buy. Anything that's "your data, displayed" — that's the category to stop renting.

The math

One mid-tier SaaS subscription: roughly $100/month, forever, climbing. A one-time command-center deployment that you own outright costs less than a year of that — and the warehouse underneath it ends the lock-in problem permanently. That's the entire reason we price our founding deployments at a one-time fee instead of a data tax: the economics of owning your stack should be obvious from the invoice.