## Documentation Index

Fetch the complete documentation index at: [/llms.txt](https://docs.neynar.com/llms.txt)

Use this file to discover all available pages before exploring further.

---

### Post a cast

#### cURL

```
curl --request POST \
  --url https://api.neynar.com/v2/farcaster/cast/ \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: NEYNAR_API_DOCS' \
  --data '
{
  "signer_uuid": "19d0c5fd-9b33-4a48-a0e2-bc7b0555baec",
  "channel_id": "neynar",
  "embeds": [\
    {\
      "cast_id": {\
        "fid": 3,\
        "hash": "<string>"\
      }\
    }\
  ],
  "idem": "<string>",
  "parent": "<string>",
  "parent_author_fid": 3,
  "text": "<string>"
}
'
```

```python
import requests

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

payload = {
    "signer_uuid": "19d0c5fd-9b33-4a48-a0e2-bc7b0555baec",
    "channel_id": "neynar",
    "embeds": [{ "cast_id": {\
                "fid": 3,\
                "hash": "<string>"\
            } }],
    "idem": "<string>",
    "parent": "<string>",
    "parent_author_fid": 3,
    "text": "<string>"
}
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({
    signer_uuid: '19d0c5fd-9b33-4a48-a0e2-bc7b0555baec',
    channel_id: 'neynar',
    embeds: [{cast_id: {fid: 3, hash: '<string>'}}],
    idem: '<string>',
    parent: '<string>',
    parent_author_fid: 3,
    text: '<string>'
  })
};

fetch('https://api.neynar.com/v2/farcaster/cast/', 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/cast/",
  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([
    'signer_uuid' => '19d0c5fd-9b33-4a48-a0e2-bc7b0555baec',
    'channel_id' => 'neynar',
    'embeds' => [
        [
                'cast_id' => [
                                'fid' => 3,
                                'hash' => '<string>'
                ]
        ]
    ],
    'idem' => '<string>',
    'parent' => '<string>',
    'parent_author_fid' => 3,
    'text' => '<string>'
  ]),
  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;
}
?>
```

```go
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

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

payload := strings.NewReader("{\n  \"signer_uuid\": \"19d0c5fd-9b33-4a48-a0e2-bc7b0555baec\",\n  \"channel_id\": \"neynar\",\n  \"embeds\": [\n    {\n      \"cast_id\": {\n        \"fid\": 3,\n        \"hash\": \"<string>\"\n      }\n    }\n  ],\n  \"idem\": \"<string>\",\n  \"parent\": \"<string>\",\n  \"parent_author_fid\": 3,\n  \"text\": \"<string>\"}")

req, _ := http.NewRequest("POST", url, payload)

req.Header.Add("x-api-key", "NEYNAR_API_DOCS")
	req.Header.Add("Content-Type", "application/json")

res, _ := http.DefaultClient.Do(req)

defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

fmt.Println(string(body))
}
```

```java
HttpResponse<String> response = Unirest.post("https://api.neynar.com/v2/farcaster/cast/")
  .header("x-api-key", "NEYNAR_API_DOCS")
  .header("Content-Type", "application/json")
  .body("{\n  \"signer_uuid\": \"19d0c5fd-9b33-4a48-a0e2-bc7b0555baec\",\n  \"channel_id\": \"neynar\",\n  \"embeds\": [\n    {\n      \"cast_id\": {\n        \"fid\": 3,\n        \"hash\": \"<string>\"\n      }\n    }\n  ],\n  \"idem\": \"<string>\",\n  \"parent\": \"<string>\",\n  \"parent_author_fid\": 3,\n  \"text\": \"<string>\"}")
  .asString();
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://api.neynar.com/v2/farcaster/cast/")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["x-api-key"] = 'NEYNAR_API_DOCS'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"signer_uuid\": \"19d0c5fd-9b33-4a48-a0e2-bc7b0555baec\",\n  \"channel_id\": \"neynar\",\n  \"embeds\": [\n    {\n      \"cast_id\": {\n        \"fid\": 3,\n        \"hash\": \"<string>\"\n      }\n    }\n  ],\n  \"idem\": \"<string>\",\n  \"parent\": \"<string>\",\n  \"parent_author_fid\": 3,\n  \"text\": \"<string>\"}"

response = http.request(request)
puts response.read_body
```

#### Response
- **200**

```json
{
  "cast": {
    "author": {
      "fid": 3
    },
    "hash": "0x71d5225f77e0164388b1d4c120825f3a2c1f131c",
    "text": "<string>"
  },
  "success": true
}
```

```json
{
  "message": "<string>",
  "code": "<string>",
  "property": "<string>",
  "status": 123
}
```

---

### Authorizations
- **x-api-key**: string, header, required
  - API key to authorize requests
  - default: NEYNAR_API_DOCS

### Body
- **signer_uuid**: string, required
  - UUID of the signer. Must be paired with API key.
- **channel_id**: string
  - Channel ID of the channel where the cast is to be posted (e.g., neynar).
- **embeds**: object[] (max array length: 2).
- **idem**: string
  - Unique identifier for the request to prevent duplicates.
- **parent**: string
  - Parent URL of the channel the cast is in, or hash of the cast.
- **parent_author_fid**: integer
  - Unique identifier of a farcaster user or app (unsigned integer).
- **text**: string

### Related topics
- [Post a reaction](https://docs.neynar.com/reference/publish-reaction)  
- [Search for casts](https://docs.neynar.com/reference/search-casts)  
- [Write Casts to Channel](https://docs.neynar.com/docs/posting-dank-memes-to-farcasters-memes-channel-with-neynars-sdk)