> **For coding agents and LLMs:** This is one Social Fetch marketing page (markdown export). For API orientation start with [`/llms.txt`](https://www.socialfetch.dev/llms.txt); for auth and crawl rules use [`/agents.txt`](https://www.socialfetch.dev/agents.txt); for every operation use [`/llms-endpoints.txt`](https://www.socialfetch.dev/llms-endpoints.txt).

## This page

- **On-site (HTML):** <https://www.socialfetch.dev/platforms/substack/posts-post-reactors>
- **Markdown (.mdx) URL:** <https://www.socialfetch.dev/platforms/substack/posts-post-reactors.mdx>

---

# Substack Reactors API

The people who reacted to a post, up to the 100 Substack lists, with their public profile details.

`GET /v1/substack/posts/{post}/reactors` lists the people who reacted to a post. The post is a numeric id or a canonical post URL. `data.postId` names the post.

`data.reactors[]` carries `id`, `name`, `photoUrl`, `bestsellerTier`, `badges` and a `primaryPublication` summary with `id`, `name` and `subdomain`. Substack lists at most 100 people per post, so a 100-row response sets `truncated` to true. `lookupStatus` is `found` or `not_found`.

## Request

- **Endpoint:** `GET /v1/substack/posts/{post}/reactors`
- **Credits:** 1 credit
Failed requests are free
- **Input:** by post id or URL
- **Full reference:** [docs](https://www.socialfetch.dev/docs/api/v1/substack/posts/post/reactors/get)
- **Platform page:** [/platforms/substack](https://www.socialfetch.dev/platforms/substack)

## FAQ

### What is in a reactor row?

The reader's numeric id, display name, photo and badges, plus the publication Substack marks as their primary one. The list does not include private account data.

### How many reactors can I get?

Substack lists at most 100 people per post. A 100-row response sets `truncated` to true because it is at that limit.

### Does this include restacks?

No. Reactions and restacks are separate lists. Use `post.restackers.list` for restacks.

### How many credits does a reactors lookup cost?

Pricing is documented on the operation in the API registry (shown on this page). Confirm on every response with meta.creditsCharged: that field is the billing source of truth.