Open Source · MIT Licensed · Free Forever

Open Marketplace Intelligence
for U.S. Small Businesses

Enterprise-grade marketplace analytics — translated into open, non-proprietary frameworks that any SMB seller, SBDC counselor, or state commerce program can run on their own laptop.

3
modules
5
article series
24
unit tests passing
MIT
licensed

What it does

The toolkit is organized around three problems every marketplace seller faces.

Marketplace Integrity

Score your listing health across ten quality signals. Surface suppression risk before it costs you ranking — and audit catalog concentration using the same statistic the U.S. DOJ uses for merger review.

Walkthrough notebook →

Supply Resilience

Diagnose stockout risk and compute safety stock and reorder points for every SKU in your catalog — including a defensible estimate of the platform suppression tail that follows a stockout.

Walkthrough notebook →

Forecasting & Guardrails

Auto-select the right forecasting method per SKU and wrap it in five operational guardrails that tell you when not to trust the forecast — before it drives a bad reorder.

Walkthrough notebook →

Who it's for

Built for the people who support U.S. small businesses.

  • SBDC counselors running client clinics
  • State and regional commerce program staff
  • Niche and vertical marketplace operators
  • SMB sellers on Amazon, Walmart, Etsy, Shopify, eBay
  • Policy researchers studying platform dynamics
  • Trade associations advocating for marketplace sellers

How this is different

Built for the people enterprise tools were never built for.

Enterprise marketplace analytics platforms

  • $50K–200K/year licensing
  • Vendor lock-in
  • Black-box methods
  • Closed source

Main Street Marketplace Toolkit

  • $0 forever
  • No vendor relationship
  • Methods documented + cited
  • MIT-licensed source

About

About the author.

Ayush Tripathi

Ayush Tripathi is a data analytics and marketplace strategy practitioner based in San Francisco. The Main Street Marketplace Toolkit is a non-commercial public-goods project, built independently and released under the MIT license.

Reading list

A five-part practitioner series.

Plain-language companion essays to each module of the toolkit. Written for counselors and operators, not engineers.

  1. 01

    A Practitioner's Guide to Quality-Aware Marketplace Ranking

    What marketplaces publicly say about what they reward — and what that means for a small seller's day-to-day operations.

    Publishing this week
  2. 02

    Stop Running Out of Stock

    Translating lead times, demand variability, and platform-suppression risk into reorder points a small seller can actually use.

    Publishing this week
  3. 03

    Short-Horizon Demand Forecasting for SMBs

    How to pick the right forecasting method for a given SKU's demand pattern — without needing a data-science degree.

    Publishing this week
  4. 04

    Forecasts Fail Quietly

    Five operational guardrails that catch the failure modes a counselor needs to know about before the next reorder cycle.

    Publishing this week
  5. 05

    Marketplace Concentration Risk

    Why the same DOJ thresholds used for merger review apply to a small seller's catalog — and how to audit your own.

    Publishing this week

MIT Licensed. Free Forever.

The complete toolkit — three working modules, an interactive Streamlit app, and Jupyter walkthrough notebooks — is open source, freely usable without asking permission, and designed to be adapted for your organization's specific context.

"All methods are derived from public academic and industry sources. All data is synthetic. Nothing is proprietary."