# Reddit User Active Subreddits API

> Returns a list of Reddit communities where a specified user participates most actively. Supports optional response formatting.

Source: https://www.sandbase.ai/apis/reddit/app/user-active-subreddits
API reference: https://www.sandbase.ai/apis/reddit/app/user-active-subreddits/docs

## Facts

- Provider: Reddit
- Type: Data API
- Endpoint: `POST https://api.sandbase.ai/v1/api/reddit/app/user-active-subreddits`
- Price: $0.0015 per call
- Free allowance: 100 calls per organization per UTC day, shared across eligible APIs
- Capabilities: api, reddit
- Billing: pay per use from one SandBase balance; no provider account or subscription needed

## Call it

`POST https://api.sandbase.ai/v1/api/reddit/app/user-active-subreddits` with `Authorization: Bearer $SANDBASE_API_KEY` and the parameters as a JSON body.

| Parameter | Type | Required | Allowed values |
| --- | --- | --- | --- |
| `username` | string | yes |  |
| `need_format` | boolean | no |  |

## FAQ

### How do I use the Reddit User Active Subreddits API?

Send a POST request to https://api.sandbase.ai/v1/api/reddit/app/user-active-subreddits with your SandBase API key in the Authorization header (Bearer) and the parameters as a JSON body. You can also try it in the Playground on this page without writing code.

### How much does the Reddit User Active Subreddits API cost?

$0.0015 per call. Every organization gets 100 free calls per UTC day, shared across eligible SandBase APIs including this one; after that each call is billed at this price from your SandBase balance. There is no subscription.

### What parameters does the Reddit User Active Subreddits API accept?

Required: username (string). Optional: need_format (boolean). The Parameters table and the Playground on this page list every field.

### What does the Reddit User Active Subreddits API return?

A JSON response returned in the same HTTP request (synchronous).

### Do I need a Reddit developer account or API key?

No. Reddit User Active Subreddits runs through SandBase, so one SandBase API key covers this endpoint and every other API and model in the catalog. You do not need to apply for Reddit API access separately.

## README

### Reddit User Active Subreddits API

Retrieve the communities where a specific user is most active by providing their `username`. Use `need_format` to toggle cleaned response output.

#### Use cases

- Analyze user interest patterns across Reddit communities.
- Evaluate an author's topical engagement across subreddits.
- Gather community participation data for user research.

#### Request

```bash
curl -X POST "https://api.sandbase.ai/v1/api/reddit/app/user-active-subreddits" \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"username": "<username>"}'
```

#### Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `username` | string | Yes | Reddit username |
| `need_format` | boolean | No | Whether to clean and format the data |

#### Notes

- Set `need_format` to true to clean and format the returned data.

#### Related APIs

- [Reddit Subreddit Mute Status](/model/reddit/app/check-subreddit-muted): Checks whether a specified Reddit subreddit is muted by the current account using its ID.
- [Reddit App Comment Replies](/model/reddit/app/comment-replies): Returns replies and nested sub-comments under a Reddit post comment using a continuation cursor.
- [Reddit Community Highlights](/model/reddit/app/community-highlights): Returns featured highlight content for a designated Reddit community, such as popular posts and announcements, by subreddit ID.