## Register Signed Key

### cURL

```
curl --request POST \  
  --url https://api.neynar.com/v2/farcaster/signer/signed_key/ \  
  --header 'Content-Type: application/json' \  
  --header 'x-api-key: NEYNAR_API_DOCS' \  
  --data '
{
  "app_fid": 3,
  "deadline": 123,
  "signature": "<string>",
  "signer_uuid": "19d0c5fd-9b33-4a48-a0e2-bc7b0555baec",
  "redirect_url": "<string>",
  "sponsor": {
    "fid": 3,
    "signature": "<string>",
    "sponsored_by_neynar": true
  }
}
'
```

```python
import requests

url = "https://api.neynar.com/v2/farcaster/signer/signed_key/"

payload = {
    "app_fid": 3,
    "deadline": 123,
    "signature": "<string>",
    "signer_uuid": "19d0c5fd-9b33-4a48-a0e2-bc7b0555baec",
    "redirect_url": "<string>",
    "sponsor": {
        "fid": 3,
        "signature": "<string>",
        "sponsored_by_neynar": True
    }
}
headers = {
    "x-api-key": "NEYNAR_API_DOCS",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)
```

```javascript
const options = {
  method: 'POST',
  headers: {'x-api-key': 'NEYNAR_API_DOCS', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    app_fid: 3,
    deadline: 123,
    signature: '<string>',
    signer_uuid: '19d0c5fd-9b33-4a48-a0e2-bc7b0555baec',
    redirect_url: '<string>',
    sponsor: {fid: 3, signature: '<string>', sponsored_by_neynar: true}
  })
};

fetch('https://api.neynar.com/v2/farcaster/signer/signed_key/', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));
```

```php
<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.neynar.com/v2/farcaster/signer/signed_key/",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'app_fid' => 3,
    'deadline' => 123,
    'signature' => '<string>',
    'signer_uuid' => '19d0c5fd-9b33-4a48-a0e2-bc7b0555baec',
    'redirect_url' => '<string>',
    'sponsor' => [
        'fid' => 3,
        'signature' => '<string>',
        'sponsored_by_neynar' => true
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "x-api-key: NEYNAR_API_DOCS"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}
?>
```

### Responses

#### Success (200)
```
{
  "public_key": "0x3daa8f99c5f760688a3c9f95716ed93dee5ed5d7722d776b7c4deac957755f22",
  "signer_uuid": "19d0c5fd-9b33-4a48-a0e2-bc7b0555baec",
  "fid": 3,
  "object": "signer",
  "permissions": [],
  "signer_approval_url": "<string>"
}
```

#### Error Responses

##### 400 Bad Request
```
{
  "message": "<string>",
  "code": "<string>",
  "property": "<string>",
  "status": 123
}
```
 
##### 403 Forbidden
```
{
  "message": "<string>",
  "code": "<string>",
  "property": "<string>",
  "status": 123
}
```
 
##### 404 Not Found
```
{
  "message": "<string>",
  "code": "<string>",
  "property": "<string>",
  "status": 123
}
```
 
##### 500 Internal Server Error
```
{
  "message": "<string>",
  "code": "<string>",
  "property": "<string>",
  "status": 123
}
```

### Parameters

#### Request Body
- `app_fid` (integer): The unique identifier of a farcaster user or app (unsigned integer) - Required
- `deadline` (integer): unix timestamp in seconds controlling how long the signed key request is valid for - Required
- `signature` (string): Signature generated by the custody address of the app - Required
- `signer_uuid` (string): UUID of the signer - Required
- `redirect_url` (string): URL to redirect after approval - Optional
- `sponsor` (object): Details about the sponsor

#### Response Body
- `public_key` (string): Ed25519 public key - Required
- `signer_uuid` (string): UUID of the signer - Required
- `status` (enum): Current status of the signer - Required
- `fid` (integer): Unique identifier - Required
- `object` (string): Type of object - Required
- `permissions` (array): List of permissions granted - Optional
- `signer_approval_url` (string): URL for approval - Optional

### Related Topics
- [Register Signed Key](https://docs.neynar.com/reference/register-signed-key-for-developer-managed-signer)
- [registerSignedKey](https://docs.neynar.com/nodejs-sdk/signer-apis/registerSignedKey)