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

# Deregister a Sender ID

> Initiate deregistration of a Sender ID from the market register.

**Required permission:** `sids:write`

Initiates deregistration from the market register. Status moves to `deregistered` on confirmation from the register.

<Warning>
  Deregistration is permanent. Messages sent using a deregistered SID will display as `Unverified` on recipient handsets in markets with mandatory registration.
</Warning>

## Path parameters

<ParamField path="sid_id" type="string" required>
  The SID ID to deregister (e.g. `sid_j1k2l3m4`).
</ParamField>

## Example

```bash theme={null}
curl -X DELETE https://api.senderz.ai/v1/sids/sid_j1k2l3m4 \
  -H "Authorization: Bearer sz_live_xxxxxxxxxxxxx"
```

## Response

<ResponseExample>
  ```json 200 theme={null}
  {
    "ok": true,
    "data": {
      "id": "sid_j1k2l3m4",
      "sender_id": "TrackFast",
      "status": "deregistered",
      "deregistered_at": "2026-07-20T09:00:00+10:00"
    },
    "meta": {
      "request_id": "req_hij456",
      "timestamp": "2026-07-20T09:00:00+10:00"
    }
  }
  ```
</ResponseExample>