Trades on 5 secondary markets

Substack

Substack is an independent newsletter and media platform that lets writers, podcasters, video creators, and other culture makers publish directly to readers and monetize through paid subscriptions. Founded in 2017 by Chris Best (CEO), Jairaj Sethi (CTO), and Hamish McKenzie (CWO) and headquartered i

thin 36.0 / 100 3 APIs View provider profile →
NewslettersPublishingCreator EconomySubscriptionEmailPodcasting

Substack is an API provider whose private shares are listed on 5 secondary markets: Forge Global, Hiive, EquityZen, Nasdaq Private Market, Augment.

Substack publishes 3 APIs indexed on the APIs.io network.

Where It Trades

F Forge Global View listing → H Hiive View listing → EZ EquityZen View listing → N Nasdaq Private Market View listing → A Augment View listing →

Listing data is compiled from the public marketplace pages of Forge Global, Hiive, EquityZen, Nasdaq Private Market, and Augment. A listing indicates that a venue has published a page for this company — it is not an offer, a quote, or investment advice, and APIs.io has no affiliation with any venue.

Work with this as data

Every listing here is available over the APIs.io API and to AI agents over MCP. Secondary Market is not yet its own endpoint on the v1 API. Reach it through catalog search and the tag graph, or the MCP server.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for secondary market

3 MCP tools reach this
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
Search the catalog 
curl "https://apis.io/api/v1/search?q=substack&limit=10"
Everything under a tag 
curl "https://apis.io/api/v1/tags/substack"

Discovery needs no key. Ratings and market analysis are Pro.

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A second provider on the same verified email joins the account you already have.