> ## Documentation Index
> Fetch the complete documentation index at: https://docs.xquik.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Set X identity

> Link your X username to your Xquik account for own-account detection

<blockquote className="agent-llms-directive">
  For the complete documentation index, see <a href="/llms.txt">llms.txt</a>.
</blockquote>

<Callout icon="circle-check" color="#16a34a">
  **Free** - does not consume credits
</Callout>

<CodeGroup>
  ```bash cURL theme={null}
  curl -X PUT https://xquik.com/api/v1/account/x-identity \
    -H "x-api-key: xq_YOUR_KEY_HERE" \
    -H "Content-Type: application/json" \
    -d '{
      "username": "elonmusk"
    }' | jq
  ```

  ```javascript Node.js theme={null}
  const response = await fetch("https://xquik.com/api/v1/account/x-identity", {
    method: "PUT",
    headers: {
      "x-api-key": "xq_YOUR_KEY_HERE",
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      username: "elonmusk",
    }),
  });
  const data = await response.json();
  ```

  ```python Python theme={null}
  import requests

  response = requests.put(
      "https://xquik.com/api/v1/account/x-identity",
      headers={"x-api-key": "xq_YOUR_KEY_HERE"},
      json={"username": "elonmusk"},
  )
  data = response.json()
  ```

  ```go Go theme={null}
  package main

  import (
      "bytes"
      "encoding/json"
      "fmt"
      "net/http"
  )

  func main() {
      body, _ := json.Marshal(map[string]interface{}{
          "username": "elonmusk",
      })

      req, err := http.NewRequest("PUT", "https://xquik.com/api/v1/account/x-identity", bytes.NewReader(body))
      if err != nil {
          panic(err)
      }
      req.Header.Set("x-api-key", "xq_YOUR_KEY_HERE")
      req.Header.Set("Content-Type", "application/json")

      resp, err := http.DefaultClient.Do(req)
      if err != nil {
          panic(err)
      }
      defer resp.Body.Close()

      var data map[string]interface{}
      if err := json.NewDecoder(resp.Body).Decode(&data); err != nil {
          panic(err)
      }
      fmt.Println(data)
  }
  ```
</CodeGroup>

## Headers

<ParamField header="x-api-key" type="string" required>
  Your API key. Session cookie authentication is also supported. Generate a key from the [dashboard](https://xquik.com/dashboard).
</ParamField>

<ParamField header="Content-Type" type="string" required>
  Must be `application/json`.
</ParamField>

## Body

<ParamField body="username" type="string" required>
  Your X username without the `@` prefix. 1-15 characters, alphanumeric and underscores only. Stored as lowercase.
</ParamField>

## Response

<Tabs>
  <Tab title="200 OK">
    <ResponseField name="success" type="boolean">Always `true` on successful update.</ResponseField>
    <ResponseField name="xUsername" type="string">The linked X username, lowercased.</ResponseField>

    ```json theme={null}
    {
      "success": true,
      "xUsername": "elonmusk"
    }
    ```
  </Tab>

  <Tab title="400 Invalid Input">
    ```json theme={null}
    { "error": "invalid_input" }
    ```

    Missing or empty `username` field.

    ```json theme={null}
    { "error": "invalid_username" }
    ```

    Username does not match the required format (1-15 characters, alphanumeric and underscores only).
  </Tab>

  <Tab title="401 Unauthenticated">
    ```json theme={null}
    { "error": "unauthenticated" }
    ```

    Missing or invalid API key.
  </Tab>

  <Tab title="429 Rate Limited">
    ```json theme={null}
    { "error": "rate_limit_exceeded", "message": "Too many requests. Try again later.", "retryAfter": 60 }
    ```

    Too many requests. Wait for the `Retry-After` header before retrying.
  </Tab>
</Tabs>

<Info>
  Your X identity is used for own-account detection in tweet style analysis. You can update it at any time by calling this endpoint again.
</Info>

<Note>
  **Related:** [Get Account](/api-reference/account/get) to view your current account details, or [Analyze Style](/api-reference/styles/analyze) to cache tweets for style analysis.
</Note>