Substack posts with mentions: API endpoint

All requests go to https://subalytics.com/api/v1/ with your key in the X-API-key header. Authentication, pagination, date filters and responses & errors apply to every endpoint.

Substack posts that mention at least one monitored company, each with its entities[]. This is separate from /api/v1/substack-posts/, which returns all posts. Post bodies are not returned: only the title, subtitle, description and the mention snippets.

Query parameters

Parameter	Type	Description
`post_id`	string	One post
`sub_id`	string	Posts by one creator
`symbol`	string	Posts mentioning one company
`min_confidence`	number	0.5–1.0, default 0.7
`published_from`	date	Published on or after
`published_to`	date	Published on or before
`updated_from`	date	Mentions last changed on or after (use for sync)
`updated_to`	date	Mentions last changed on or before
`limit`	int	Results per page (default 25, max 100)
`cursor`	string	next_cursor from the previous page

Response fields

Field	Type	Description
`post_id`	string	Public post ID; content_id in entity-mentions
`sub_id`	string	The creator
`author_name`	string \| null	Author
`title`	string \| null	Post title
`subtitle`	string \| null	Post subtitle
`description`	string \| null	Post description
`canonical_url`	string	Link to the post
`published_utc`	date	When the post was published
`entities`	array	Company mentions: mention_id, symbol, company_name, match_type, matched_text, confidence, snippet, field
`created_at`	date	When the post first appeared in this product
`updated_at`	date	When its mentions last changed

Example

GET /api/v1/entity-substack-posts/?symbol=META&limit=1

{
  "success": true,
  "results": [
    {
      "post_id": "173920451",
      "sub_id": "803b198749",
      "author_name": "Jane Writer",
      "title": "The Ad Market Reset",
      "subtitle": "Instagram now drives more ad revenue than the core app.",
      "description": "Why Meta and Google are fighting over the same small advertisers.",
      "canonical_url": "https://newsletter.example.com/p/the-ad-market-reset",
      "published_utc": "2026-09-20T11:00:00Z",
      "entities": [
        {
          "mention_id": "51b8e2d7f03a9c64",
          "symbol": "META",
          "company_name": "Meta Platforms, Inc.",
          "match_type": "product",
          "matched_text": "Instagram",
          "confidence": 0.78,
          "snippet": "Instagram now drives more ad revenue than the core app.",
          "field": "subtitle"
        },
        {
          "mention_id": "a3d90c6e18f2b475",
          "symbol": "GOOGL",
          "company_name": "Alphabet Inc.",
          "match_type": "alias",
          "matched_text": "Google",
          "confidence": 0.84,
          "snippet": "Why Meta and Google are fighting over the same small advertisers.",
          "field": "description"
        }
      ],
      "created_at": "2026-09-20T12:31:17Z",
      "updated_at": "2026-09-20T12:31:17Z"
    }
  ],
  "returned_results": 1,
  "limit": 1,
  "next_cursor": "6a7d9b02c8173839e2253b10"
}

This page as Markdown: /docs/entity-substack-posts.md. All docs in one file: /llms-full.txt.