# Discover Substack posts by topic

**Use case:** 

Create a compact public Substack post dataset for one topic phrase.

## Input

```json
{
  "workflow": "discover_topics",
  "keywords": [
    "independent publishing"
  ],
  "maxPublications": 10,
  "maxPosts": 10,
  "maxCommentsPerPost": 50,
  "maxTotalComments": 250,
  "contentAccessFilter": "any",
  "minimumEngagement": 0,
  "outputMode": "current",
  "includeUnchanged": false,
  "includeBody": false,
  "includePublication": true,
  "includeAuthors": true,
  "includeComments": false,
  "includeRawSource": false,
  "maxBuyerChargeUsd": 0.05,
  "maxRequests": 50000,
  "maxSourceBytes": 2000000000,
  "maxStateBytes": 64000000,
  "maxRuntimeSecs": 10800,
  "requestTimeoutSecs": 30,
  "retryAttempts": 2,
  "requestIntervalMs": 250
}
```

## Output

```json
{
  "recordType": {
    "label": "Record type",
    "format": "string"
  },
  "publicationName": {
    "label": "Publication",
    "format": "string"
  },
  "title": {
    "label": "Post title",
    "format": "string"
  },
  "authorName": {
    "label": "Author",
    "format": "string"
  },
  "contentType": {
    "label": "Content type",
    "format": "string"
  },
  "contentAccess": {
    "label": "Content access",
    "format": "string"
  },
  "publishedAt": {
    "label": "Published at",
    "format": "string"
  },
  "reactionsCount": {
    "label": "Reactions",
    "format": "integer"
  },
  "commentsCount": {
    "label": "Comments",
    "format": "integer"
  },
  "restacksCount": {
    "label": "Restacks",
    "format": "integer"
  },
  "rank": {
    "label": "Observed rank",
    "format": "integer"
  },
  "commentText": {
    "label": "Comment text",
    "format": "string"
  },
  "changeType": {
    "label": "Change type",
    "format": "string"
  },
  "coverageState": {
    "label": "Coverage state",
    "format": "string"
  },
  "canonicalUrl": {
    "label": "Canonical URL",
    "format": "string"
  },
  "collectedAt": {
    "label": "Collected at",
    "format": "string"
  }
}
```

## About this Actor

This example demonstrates how to use [Substack Publication, Post & Comment Monitor](https://apify.com/luminar/substack-publication-post-comment-monitor.md) with a specific input configuration. Visit the [Actor detail page](https://apify.com/luminar/substack-publication-post-comment-monitor.md) to learn more, explore other use cases, and run it yourself.


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

- **AI agents and MCP clients** — the [Apify MCP server](https://docs.apify.com/integrations/mcp.md) at `https://mcp.apify.com` (remote, streamable HTTP, OAuth on first use).
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For full API examples (JavaScript, Python, CLI, MCP, OpenAPI), see this Task's Actor page: https://apify.com/luminar/substack-publication-post-comment-monitor.md

For more details, see Apify documentation as [Markdown index](https://docs.apify.com/llms.txt) and [Markdown full-text](https://docs.apify.com/llms-full.txt).