> **For coding agents and LLMs:** This is one page from the Social Fetch docs (markdown export). For curated orientation and workflow guidance, start with [`/llms.txt`](https://www.socialfetch.dev/llms.txt); for agent onboarding and crawl rules, use [`/agents.txt`](https://www.socialfetch.dev/agents.txt); for the full endpoint list with links to pages like this one, use [`/llms-endpoints.txt`](https://www.socialfetch.dev/llms-endpoints.txt); for one platform's parameters and curls, use [`/llms-{platform}.txt`](https://www.socialfetch.dev/llms-tiktok.txt); use [`/llms.json`](https://www.socialfetch.dev/llms.json) when you need structured JSON for tool registration.

## This page

- **On-site (HTML):** <https://www.socialfetch.dev/docs/api/v1/substack/notes/noteid/replies/get>
- **Markdown (.mdx) URL:** <https://www.socialfetch.dev/docs/api/v1/substack/notes/noteid/replies/get.mdx>

## API base URL and authentication

- **API origin (from OpenAPI `servers`):** `https://api.socialfetch.dev`
- **Authentication:** send `x-api-key: sfk_...` on `/v1/**` and `/v2/**` routes unless the operation is explicitly anonymous (check OpenAPI `security`, the [API reference hub](https://www.socialfetch.dev/docs/api.mdx), [`/llms.txt`](https://www.socialfetch.dev/llms.txt), or [`/llms.json`](https://www.socialfetch.dev/llms.json) for each route).
- **OpenAPI JSON:** <https://www.socialfetch.dev/openapi.json>

## Recommended docs entrypoints (this site)

- [Documentation overview](https://www.socialfetch.dev/docs.mdx) — top-level orientation (markdown).
- [Quickstart](https://www.socialfetch.dev/docs/quickstart.mdx) — authenticate with `x-api-key`, validate auth with `whoami`, and understand the JSON envelope.
- [SDK](https://www.socialfetch.dev/docs/sdk.mdx) — official TypeScript SDK guide, including `SocialFetchClient`, `Result`, and `unwrap()`.
- [Capability matrix](https://www.socialfetch.dev/docs/capability-matrix.mdx) — every operation with identifiers, pagination, outcomes, media download, credits, and its SDK method. Generated from OpenAPI, so use it for route selection instead of scanning individual pages.
- [Recipes](https://www.socialfetch.dev/docs/recipes.mdx) — copyable workflows (brand monitoring, transcripts, Ad Library, creator scoring, Reddit research) with credit callouts and SDK examples.
- [Integrations](https://www.socialfetch.dev/docs/integrations.mdx) — MCP for AI clients, n8n verified node, Apify Store Actors, Make custom app, SDK, and REST API connection paths.
- [MCP product page](https://www.socialfetch.dev/mcp) — hosted MCP overview, OAuth, Skills install.
- [MCP integration](https://www.socialfetch.dev/docs/integrations/mcp.mdx) — hosted `/mcp` server, OAuth, Cursor/VS Code/Claude install snippets, 910 endpoint tools, plus docs_search/docs_read for implementation help.
- [n8n integration](https://www.socialfetch.dev/docs/integrations/n8n.mdx) — install `n8n-nodes-socialfetch`, credentials, and workflow examples.
- [Apify integration](https://www.socialfetch.dev/docs/integrations/apify.mdx) — Store Actors under @social-fetch, PPE billing, dataset export, and quick start.
- [Make integration](https://www.socialfetch.dev/docs/integrations/make.mdx) — custom app modules for Make scenarios, API key credentials, and module catalog.
- [`/llms-endpoints.txt`](https://www.socialfetch.dev/llms-endpoints.txt) — every documented operation with a direct link to that route's agent-readable markdown page (prefer this over parsing OpenAPI).
- [`/llms-{platform}.txt`](https://www.socialfetch.dev/llms-tiktok.txt) — per-platform endpoint files generated from OpenAPI (parameters, credits, curls).
- [`/agents.txt`](https://www.socialfetch.dev/agents.txt) — agent crawl/onboarding file with capabilities, auth rules, and allowlist.
- [`/llms.json`](https://www.socialfetch.dev/llms.json) — structured machine-readable operation inventory with parameter names, pagination, outcomes, credits, and SDK mapping.
- [API reference hub](https://www.socialfetch.dev/docs/api.mdx) — human-friendly index of operations with links into generated pages.
- [Errors](https://www.socialfetch.dev/docs/errors.mdx) — shared error envelope and HTTP status guidance.
- [Credits](https://www.socialfetch.dev/docs/credits.mdx) — metering, `402`, and planning batch jobs.
- Outcome semantics such as `found`, `not_found`, and `private` are documented in [Errors](https://www.socialfetch.dev/docs/errors.mdx) and on operation pages when present in the OpenAPI contract.

## Markdown docs convention

- Every docs page has a markdown twin: append **`.mdx`** to the docs pathname (for example `/docs/quickstart` → `/docs/quickstart.mdx`).
- Agents that send `Accept: text/markdown` on `/docs/**` HTML URLs may receive markdown directly (same URL, `Vary: Accept`).
- Published blog posts use the same convention: `/blog/{slug}` → `/blog/{slug}.mdx`, or `Accept: text/markdown` on the HTML URL (`Vary: Accept`).

---
# List Substack note replies (https://www.socialfetch.dev/docs/api/v1/substack/notes/noteid/replies/get)

## Summary

List the reply branches and comments of a Substack note.

**Tags:** `Substack`

## HTTP

- **Method:** GET
- **Path:** `/v1/substack/notes/{noteId}/replies`
- **Base URL:** `https://api.socialfetch.dev`

## Capability summary

- **SDK mapping:** `client.substack.listNoteReplies({ noteId: "378007586" })`
- **Accepted identifiers:** `noteId` (path)
- **Pagination:** none
- **Business outcome field:** `data.lookupStatus` with values `found`, `not_found`

## Credits

- **Base:** 1 credit per successful lookup.
- **Maximum on success (200):** 1 credit.
- **Failed requests (`lookup_failed`, `503`):** not charged.
- **Authoritative field:** `meta.creditsCharged`.

## Authentication

- **`x-api-key`**: API key (`sfk_...`)

## Parameters

### `noteId` (path)

- **Required:** yes
- **Constraints:** type `string`
- **Description:** A note id as Substack displays it, e.g. `378007586`.

## Responses (status codes)

- **200**: Substack note replies.
- **400**: Invalid request
- **401**: Missing or invalid API key
- **402**: Insufficient credits
- **500**: Unexpected or billing error
- **502**: Lookup could not be completed.
- **503**: Service temporarily unavailable; safe to retry with backoff.

## Response body (200)

Substack note replies.

### Field outline

- **data** (required) — type `object`. Endpoint-specific response payload.
  - **lookupStatus** (required) — type `string`; enum: found, not_found. Whether the note was found.
  - **noteId** (required) — type `integer`; nullable. Numeric note id.
  - **root** (required) — type `object`; nullable. The note the replies belong to.
    - **id** (required) — type `integer`. Numeric note id.
    - **body** (required) — type `string`; nullable. The note's plain text.
    - **bodyJson** (required) — type `object`; nullable. The note's rich text document, when there is one.
    - **createdAt** (required) — type `string`; nullable. ISO 8601 timestamp, or null when Substack does not publish one.
    - **editedAt** (required) — type `string`; nullable. ISO 8601 timestamp, or null when Substack does not publish one.
    - **author** (required) — type `object`. The note's author.
      - **id** (required) — type `integer`; nullable. Numeric user id.
      - **name** (required) — type `string`; nullable. The name shown for the author.
      - **handle** (required) — type `string`; nullable. The author's handle.
      - **slug** (required) — type `string`; nullable. The author's profile slug.
      - **bio** (required) — type `string`; nullable. The author's short biography.
      - **photoUrl** (required) — type `string`; nullable. The author's profile photo URL.
      - **badge** (required) — type `object`; nullable. The author's main badge, when there is one.
      - **badges** (required) — type `object`; nullable. The author's reader status fields, when available.
      - **bestsellerTier** (required) — type `integer`; nullable. The author's bestseller tier.
      - **primaryPublication** (required) — type `object`; nullable. The author's primary publication, when there is one.
    - **reactionCount** (required) — type `integer`; nullable. The number of reactions.
    - **reactions** (required) — type `object`. Emoji to reaction count.
    - **restackCount** (required) — type `integer`; nullable. The number of restacks.
    - **replyCount** (required) — type `integer`; nullable. The number of replies.
    - **language** (required) — type `string`; nullable. The note's language code.
    - **isAiGenerated** (required) — type `boolean`; nullable. Substack's own flag.
    - **translation** (required) — type `object`; nullable. A translation of the note, when there is one.
    - **replyPermission** (required) — type `string`; nullable. Who may reply to the note.
    - **ancestorPath** (required) — type `string`; nullable. The note's position in a thread.
    - **attachments** (required) — type `array`. Images, links, posts or polls attached to the note.
      - _items:_
  - **replies** (required) — type `array`. The reply branches under the note.
    - _items:_
      - **comment** (required) — type `object`. The first reply in the branch.
      - **descendantComments** (required) — type `array`. Replies under the first reply.
        - _items:_
  - **moreBranches** (required) — type `integer`; minimum: 0. Reply branches not included in this response.
- **meta** (required) — type `object`. Metadata describing the request and billing outcome.
  - **requestId** (required) — type `string`; minLength: 1. Unique request identifier for tracing this API call.
  - **creditsCharged** (required) — type `integer`; minimum: 0. Credits charged for this request.
  - **version** (required) — type `string`; enum: v1. Public API version that served the response.

### Example JSON (found)

```json
{
  "data": {
    "lookupStatus": "found",
    "noteId": 378007586,
    "root": {
      "id": 378007586,
      "body": "Y'all ever wonder why AI got no rules?? 👀 OpenAI's president cut a check to MAGA Inc… months later states got blocked from regulating AI. Follow the money. Education is Elevation…\n\nRandom fact: OpenAI was founded in 2015 as a nonprofit research lab.\n\nhttps://www.youtube.com/shorts/Ej_glv7TyZ4",
      "bodyJson": {
        "type": "doc",
        "attrs": {
          "schemaVersion": "v1",
          "title": null
        },
        "content": [
          {
            "type": "paragraph",
            "content": [
              {
                "type": "text",
                "text": "Y'all ever wonder why AI got no rules?? 👀 OpenAI's president cut a check to MAGA Inc… months later states got blocked from regulating AI. Follow the money. Education is Elevation…"
              }
            ]
          }
        ]
      },
      "createdAt": "2026-11-03T23:30:01.636Z",
      "editedAt": null,
      "author": {
        "id": 9168619,
        "name": null,
        "handle": null,
        "slug": null,
        "bio": null,
        "photoUrl": null,
        "badge": null,
        "badges": null,
        "bestsellerTier": null,
        "primaryPublication": null
      },
      "reactionCount": null,
      "reactions": {},
      "restackCount": null,
      "replyCount": null,
      "language": null,
      "isAiGenerated": null,
      "translation": null,
      "replyPermission": null,
      "ancestorPath": null,
      "attachments": []
    },
    "replies": [
      {
        "comment": {
          "id": 378544234,
          "body": "The companies asked for regulation. Here’s goes your conspiracy theory down the drain.",
          "bodyJson": {
            "type": "doc",
            "attrs": {
              "schemaVersion": "v1",
              "title": null
            },
            "content": [
              {
                "type": "paragraph",
                "content": [
                  {
                    "type": "text",
                    "text": "The companies asked for regulation. Here’s goes your conspiracy theory down the drain."
                  }
                ]
              }
            ]
          },
          "createdAt": "2026-11-04T14:58:03.322Z",
          "editedAt": null,
          "author": {
            "id": 1037109,
            "name": "Gal",
            "handle": null,
            "slug": null,
            "bio": null,
            "photoUrl": "https://substack-post-media.s3.amazonaws.com/public/images/8a8ff3c3-6569-4210-ac32-7768b6ced506_144x144.png",
            "badge": null,
            "badges": {
              "bestsellerTier": null,
              "subscriberTier": null,
              "leaderboard": null,
              "vip": false,
              "badge": null,
              "subscriber": null
            },
            "bestsellerTier": null,
            "primaryPublication": {
              "id": 6784414,
              "name": "Gal",
              "subdomain": "galzi",
              "customDomain": null,
              "logoUrl": null
            }
          },
          "reactionCount": 0,
          "reactions": {
            "❤": 0
          },
          "restackCount": 0,
          "replyCount": 0,
          "language": "en",
          "isAiGenerated": false,
          "translation": null,
          "replyPermission": "everyone",
          "ancestorPath": "378007586",
          "attachments": []
        },
        "descendantComments": []
      }
    ],
    "moreBranches": 0
  },
  "meta": {
    "requestId": "req_a5723af3-9d24-4f6f-a490-70da087eccea",
    "creditsCharged": 1,
    "version": "v1"
  }
}
```

### Machine-readable error codes

When an error JSON body is returned, it may include one of these `error.code` values (derived from the OpenAPI schemas for this operation; additional codes may exist at runtime):

- `bad_request`

## Error handling & retries

Interpret HTTP status codes using the descriptions below. Do not assume a JSON body unless the OpenAPI schema defines one for that status.

- **400**: Invalid request **Retry:** Fix the request; retrying the same invalid payload will not help.
- **401**: Missing or invalid API key **Retry:** Fix the API key first; retrying without changes will not help.
- **402**: Insufficient credits **Retry:** Do not retry without resolving billing/credits (retrying the same request will not help).
- **500**: Unexpected or billing error
- **502**: Lookup could not be completed. **Retry:** May be transient; a few retries with backoff are reasonable.
- **503**: Service temporarily unavailable; safe to retry with backoff. **Retry:** Usually safe to retry with exponential backoff and jitter.

### Suggested client defaults

- Send the API key using the `x-api-key` header on every request.
- On `503` (and sometimes `502`), retry with backoff; cap retries and surface a clear error to the user.
- On `402`, surface an actionable billing message rather than blind retries.

## Examples

### TypeScript SDK

```typescript
import { SocialFetchClient } from "@socialfetch/sdk";

const client = new SocialFetchClient({
  apiKey: process.env.SOCIALFETCH_API_KEY!,
});

const result = await client.substack.listNoteReplies({
  noteId: "378007586",
});

if (!result.ok) {
  console.error(result.error);
} else {
  console.log(result.value.data);
}
```

### Node.js

```javascript
const response = await fetch(
  "https://api.socialfetch.dev/v1/substack/notes/378007586/replies",
  {
    headers: {
      "x-api-key": "YOUR_API_KEY"
    }
  }
);

const data = await response.json();
console.log(data);
```

### cURL

```bash
curl "https://api.socialfetch.dev/v1/substack/notes/378007586/replies" \
  -H "x-api-key: YOUR_API_KEY"
```

### Python

```python
import requests

response = requests.get(
    "https://api.socialfetch.dev/v1/substack/notes/378007586/replies",
    headers={"x-api-key": "YOUR_API_KEY"},
)
data = response.json()
print(data)
```