# Substack B2B Newsletter Sponsorship & Creator Leads Finder

**Use case:** 

Discover Substack newsletters and creators by niche keyword with subscriber counts, bestseller tiers, custom domains, and social handles for sponsorship outreach.

## Input

```json
{
  "mode": "creator_leads",
  "searchKeywords": [
    "fintech",
    "b2b saas",
    "ai agents"
  ],
  "publications": [
    "pragmaticengineer.substack.com"
  ],
  "maxItemsPerTarget": 40,
  "includeFullContent": true,
  "proxyConfiguration": {
    "useApifyProxy": true
  }
}
```

## Output

```json
{
  "recordType": {
    "label": "Record Type",
    "format": "string"
  },
  "publicationName": {
    "label": "Publication",
    "format": "string"
  },
  "authorName": {
    "label": "Author",
    "format": "string"
  },
  "subscriberCountLabel": {
    "label": "Subscribers",
    "format": "string"
  },
  "publicationUrl": {
    "label": "Publication URL",
    "format": "string"
  },
  "substackAddress": {
    "label": "Substack Address",
    "format": "string"
  },
  "postTitle": {
    "label": "Post Title",
    "format": "string"
  },
  "reactionsCount": {
    "label": "Likes",
    "format": "integer"
  },
  "wordCount": {
    "label": "Words",
    "format": "integer"
  }
}
```

## How it works

### 1. Sign up on Apify or log in

The Substack Scraper & API – Newsletter Leads & Full Posts Actor is ready to run with the inputs already set for "Substack B2B Newsletter Sponsorship & Creator Leads Finder". [Sign up or log in](https://console.apify.com/create-task-from-example/VThtbuzu5WNErUhuK) and you'll land in Apify Console with a copy of this exact task.

### 2. Start the "Substack B2B Newsletter Sponsorship & Creator Leads Finder" task

The Substack Scraper & API – Newsletter Leads & Full Posts Actor will start running based on the input automatically. You can also change all the input fields, like extraction mode, niche keywords (for creator_leads mode), and more, to match your specific use case.

### 3. Receive the "Substack B2B Newsletter Sponsorship & Creator Leads Finder" output

Monitor the progress in real time. You will be notified as soon as your dataset is complete and ready for review. Each result includes data such as record type, publication, author, and more.

### 4. Integrate into your workflow

The final output is delivered in JSON, CSV, or Excel format, ready to be plugged into your workflow. You can also [run the "Substack B2B Newsletter Sponsorship & Creator Leads Finder" task via API](https://apify.com/ramgoxxx/substack-newsletter-leads-posts-scraper.md).

## About this Actor

This example demonstrates how to use [Substack Scraper & API – Newsletter Leads & Full Posts](https://apify.com/ramgoxxx/substack-newsletter-leads-posts-scraper.md) with a specific input configuration. Visit the [Actor detail page](https://apify.com/ramgoxxx/substack-newsletter-leads-posts-scraper.md) to learn more, explore other use cases, and run it yourself.


## How to integrate an Actor?

This Task's input is already configured above. Use it as-is rather than inventing a new one.

Do not guess an integration path. Every one of them is in the agent quickstart at https://apify.com/agents.md: the Apify MCP server, Agent Skills with the Apify CLI, the JavaScript and Python clients, the REST API, and the account-free path for an agent with no human to sign in. It also carries the rule on stating cost before the first paid run.

For full API examples (JavaScript, Python, CLI, MCP, OpenAPI), see this Task's Actor page: https://apify.com/ramgoxxx/substack-newsletter-leads-posts-scraper.md

Each client library has reference documentation the quickstart does not restate: [JavaScript/TypeScript](https://docs.apify.com/api/client/js/docs.md) (`npm install apify-client`) and [Python](https://docs.apify.com/api/client/python/docs.md) (`pip install apify-client`).