Skip to main content
POST
/
v2
/
farcaster
/
cast
/
Post a cast
curl --request POST \
  --url https://api.neynar.com/v2/farcaster/cast/ \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --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>"
}
'
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": "<api-key>",
"Content-Type": "application/json"
}

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

print(response.text)
const options = {
method: 'POST',
headers: {'x-api-key': '<api-key>', '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

$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: <api-key>"
],
]);

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

curl_close($curl);

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

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

req.Header.Add("x-api-key", "<api-key>")
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))

}
HttpResponse<String> response = Unirest.post("https://api.neynar.com/v2/farcaster/cast/")
.header("x-api-key", "<api-key>")
.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>\"\n}")
.asString();
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"] = '<api-key>'
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>\"\n}"

response = http.request(request)
puts response.read_body
{
  "cast": {
    "author": {
      "fid": 3
    },
    "hash": "0x71d5225f77e0164388b1d4c120825f3a2c1f131c",
    "text": "<string>"
  },
  "success": true
}
{
"message": "<string>",
"code": "<string>",
"property": "<string>",
"status": 123
}
{
"message": "<string>",
"code": "<string>",
"property": "<string>",
"status": 123
}
{
"message": "<string>",
"code": "<string>",
"property": "<string>",
"status": 123
}
{
"message": "<string>",
"code": "<string>",
"property": "<string>",
"status": 123
}

Easiest way to start is to clone our repo that has sign in w/ Farcaster and writes. Ensure you’re using a signer_uuid that was made with the same API key.

Node.js SDK

🔗 SDK Method: publishCast Use this API endpoint with the Neynar Node.js SDK for typed responses and better developer experience.

Authorizations

x-api-key
string
header
default:NEYNAR_API_DOCS
required

API key to authorize requests

Body

application/json
signer_uuid
string
required

UUID of the signer. signer_uuid is paired with API key, can't use a uuid made with a different API key.

Example:

"19d0c5fd-9b33-4a48-a0e2-bc7b0555baec"

channel_id
string

Channel ID of the channel where the cast is to be posted. e.g. neynar, farcaster, warpcast

Example:

"neynar"

embeds
PostCastReqBodyEmbeds · object[]
Maximum array length: 2
idem
string

An Idempotency key is a unique identifier for the request. Note:

  1. This is used to prevent duplicate requests. Use the same idem key on retry attempts.
  2. This should be a unique identifier for each request.
  3. Recommended format is a 16-character string generated by the developer at the time of making this request.
parent
string

parent_url of the channel the cast is in, or hash of the cast

parent_author_fid
integer<int32>

The unique identifier of a farcaster user or app (unsigned integer)

Required range: x >= 0
Example:

3

text
string

Response

Success

cast
object
required
success
boolean
required