About

We build the FBA tooling
we wished existed.

MarketMonster.co is an independent software company building inbound-shipment, inventory, and listing tooling for Amazon Selling Partners. We integrate directly with the Amazon Selling Partner API (SP-API) to give sellers a faster, sharper, and more honest workflow than the incumbents — without paywalled "insights," without a half-finished workflow buried in a 2024 roadmap, and without an upsell hiding behind every button.

What we do

MarketMonster builds an Amazon Seller workflow on top of the public Selling Partner API. Today the platform covers FBA inbound shipment creation, box-content generation, label and packing-list rendering, real-time inventory and shipment tracking, listing price history, and team-based pick-list workflows. Every feature operates on data we retrieve under your explicit SP-API authorization; we do not scrape, we do not aggregate seller data across customers, and we do not sell data to third parties.

How we're different

The incumbent tools in this space were built when Amazon's old shipment workflow still worked. The new workflow — Send-to-Amazon, with its placement options, transportation timeouts, and partnered-carrier quirks — has broken most of them, and they patch it as a side project. MarketMonster was built against the new workflow from day one: we race Amazon's placement options in-flight, we handle the silent 400s and phantom rate limits without the user noticing, and we make the bookkeeping data Amazon already gives you (listing price history, fee breakdowns) a first-class feature instead of a paywalled add-on.

Independence

MarketMonster is not affiliated with, endorsed by, or sponsored by Amazon.com, Inc. We operate as a third-party Solution Provider under the Amazon SP-API program. We make no claims of preferential treatment, insider access, or non-public data. Everything we surface is data Amazon already provides to you, the seller, through their public API — we just make it useful.