# X (Twitter) Follow check API (twitter.check_follow)

- Canonical page: https://everyinfra.com/en/twitter-api/check_follow
- Endpoint: POST /api/v1/social with {"platform": "twitter", "action": "check_follow", "params": {...}}
- Price: $0.000806 per call ($0.81 per 1,000 requests); failed and empty results are not charged
- Returns: single object
- Mode: sync; add "mode": "async" for slow tasks

## Health

- Live health (24h percent, hourly and daily trends): https://api.everyinfra.com/api/v1/social/availability?platform=twitter&action=check_follow

## Parameters

| name | type | required | default | description |
|---|---|---|---|---|
| username | not declared | yes | not declared | The account that may be following, such as `NASA`; a leading @ is removed. |
| target_username | not declared | yes | not declared | The account `check_follow` checks against: does `username` follow it? For example `NASAHubble`; a leading @ is removed. |

## Response fields (items in `results`)

| field | meaning |
|---|---|
| username | Username (@handle). |
| target_username | platform-native meaning |
| is_following | platform-native meaning |
| platform | Source platform identifier, the same as platform in the request (for example xiaohongshu, tiktok). |

## Example

```bash
curl -X POST 'https://api.everyinfra.com/api/v1/social' \
  -H "Authorization: Bearer $EVERYINFRA_API_KEY" \
  -H 'Content-Type: application/json' \
  --data-raw '{
  "platform": "twitter",
  "action": "check_follow",
  "params": {
    "username": "nasa",
    "target_username": "NASAHubble"
  }
}'
```

```python
import os
import requests

response = requests.post(
    "https://api.everyinfra.com/api/v1/social",
    headers={"Authorization": f"Bearer {os.environ['EVERYINFRA_API_KEY']}"},
    json={
        "platform": "twitter",
        "action": "check_follow",
        "params": {
            "username": "nasa",
            "target_username": "NASAHubble",
        },
    },
    timeout=120,
)
print(response.status_code)
print(response.json())
```

## Response example

No real sample for these example parameters yet: structure only, every value is a placeholder (…).

```text
{
  "id": "req_…",
  "platform": "twitter",
  "action": "check_follow",
  "results": {
    "username": …,
    "target_username": …,
    "is_following": …,
    "platform": …
  },
  "billing": {
    "charged": …,
    "charged_usd": …,
    "balance_after_usd": …,
    …
  },
  "quota": { … }
}
```

## Also

- Capability catalog (no key): https://api.everyinfra.com/api/v1/social/catalog?platform=twitter
- OpenAPI: https://everyinfra.com/openapi.json · Agents guide: https://everyinfra.com/agents.md