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For data, research & AI teams

Newsletter data, structured and ready for your pipeline

Newsletters carry analysis, launches and sponsorships that never reach a press release. NewsletterFIT turns each issue into records: the newsletter, the date, the sponsors, and the companies, people and topics mentioned. Pull them over a REST API or give an agent the MCP server.

Get an API keyRead the API docs

7 days of Pro, no credit card required

The problem

Newsletters are a source most datasets skip

They are spread across platforms, formats change per publisher, and sponsorships sit inside the body text. Scraping them yourself means maintaining parsers for every platform and every layout.

What you can do

  • Add newsletters as a source

    Search newsletters, articles and entities and page through results with stable ids, from one API key.

    REST API

  • Give your agents the record

    The MCP server works with Claude, ChatGPT, Cursor and other MCP clients, with OAuth sign-in or an API key.

    MCP server

  • Entities, not just text

    Companies, products, people, guests, topics and sponsors are extracted per issue and linked to the newsletter they came from.

    Methodology

  • Bulk exports

    Enterprise adds JSON exports of recent publications, articles, entities and the links between them.

    Exports

Example

One call, structured results

An example request and an abridged response. Every endpoint, parameter and limit is in the API reference.

REQUESTEXAMPLE
curl "https://newsletterfit.com/api/v1/search?q=ai%20agents" \
  -H "Authorization: Bearer nf_live_YOUR_KEY"
RESPONSE (ABRIDGED)
{
  "success": true,
  "data": {
    "query": "ai agents",
    "newsletters": [
      {
        "id": 42,
        "self": "/api/v1/publications/42",
        "name": "The Ops Ledger",
        "audience": { "value": 64000, "label": "64K", "basis": "substack" }
      }
    ]
  },
  "meta": { "page": 1, "limit": 20, "total": 3 }
}

How it works

  1. 01

    Create a key

    Start the trial and create an API key from Billing.

  2. 02

    Call the API or connect MCP

    REST for pipelines, MCP for agents and assistants.

  3. 03

    Scale on a plan

    API and MCP quotas grow with each plan; Enterprise adds exports.

What you'll use

FAQ

What does the API return?

Newsletters, articles and entities (companies, products, people, guests, technologies, topics, brands and sponsors), with links between them. Article full text and raw files are not included.

Is there an OpenAPI spec?

Yes, an OpenAPI 3.1 file, plus a Markdown reference and MCP tool schemas for agents.

How is the API metered?

API and MCP calls have their own monthly quota per plan, separate from in-app usage, and a per-minute rate limit per key.

Can I use the data to train models?

Contact support before using the data for model training or redistribution.

Try it on your own market for 7 days.

Get an API key