Understory ranks No. 140 on Inc. 5000 list of fastest-growing companies in U.S. Read more about Understory on the 2026 Inc. 5000 list

Understory Logo
+1 415 903 7062

Growing seller or customer count on a platform

A marketplace or platform company whose count of sellers, merchants, or connected accounts is growing, seen in public directories and listings.

Platforms that add sellers quickly hit payments, onboarding, and compliance problems at scale. Growth you can count from outside tells you which ones are about to.

Strength
Good
Act within
The quarter the growth shows up
Best for
Companies selling payments, onboarding, or infrastructure to platforms

How we detect it

Runs on Apify, Claude Code, and Clay.

  1. Count sellers or merchants from public directories on a schedule.
  2. Flag accounts growing fastest, and pair with hiring in operations.

What it triggers

An opening line, to show the angle. It never goes out as written.

You have added about 400 sellers since summer. At around 1,000 most marketplaces start to feel payouts and onboarding break.
  • Email: Lead with the problem the next order of magnitude brings.

Where it goes wrong

  • Guessing the count. Show the number you counted.

Stack it with

A second signal on the same account moves it up.

  • Headcount growth

    An account’s headcount, or the headcount of one team, grows quickly over a quarter.

  • Funding round

    A target account announces a new round of funding.

More custom scrapes signals

Every custom scrapes signal

  • Google Maps listing

    Local and physical businesses found through their Google Maps listings, with their category, location, and reviews.

  • Review volume change

    A business’s Google or app store review count or rating moves sharply up or down.

  • Open source and GitHub activity

    Developers at an account star, fork, or contribute to repositories in your category.

FAQ

FAQs about this signal

A marketplace or platform company whose count of sellers, merchants, or connected accounts is growing, seen in public directories and listings. Platforms that add sellers quickly hit payments, onboarding, and compliance problems at scale. Growth you can count from outside tells you which ones are about to.

Count sellers or merchants from public directories on a schedule. Flag accounts growing fastest, and pair with hiring in operations. Understory Agency runs it on Apify, Claude Code, and Clay.

The window to act is the quarter the growth shows up. Understory Agency routes it to email. Lead with the problem the next order of magnitude brings.

It works best for companies selling payments, onboarding, or infrastructure to platforms. It is strongest alongside “Headcount growth” and “Funding round”.

Or let us run it for you

Understory Agency's GTM engineers build the detection in Clay, wire it to the play that fits, and sync every touch to your CRM. Tell us who you sell to, and we'll show you where we would start.