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POST
/
v1
/
validateMessage
Validate signed message
curl --request POST \
  --url https://snapchain-api.neynar.com/v1/validateMessage \
  --header 'Content-Type: application/octet-stream' \
  --header 'x-api-key: <api-key>' \
  --data '"<string>"'
import requests

url = "https://snapchain-api.neynar.com/v1/validateMessage"

payload = "<string>"
headers = {
"x-api-key": "<api-key>",
"Content-Type": "application/octet-stream"
}

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

print(response.text)
const options = {
method: 'POST',
headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/octet-stream'},
body: JSON.stringify('<string>')
};

fetch('https://snapchain-api.neynar.com/v1/validateMessage', 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://snapchain-api.neynar.com/v1/validateMessage",
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('<string>'),
CURLOPT_HTTPHEADER => [
"Content-Type: application/octet-stream",
"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://snapchain-api.neynar.com/v1/validateMessage"

payload := strings.NewReader("\"<string>\"")

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

req.Header.Add("x-api-key", "<api-key>")
req.Header.Add("Content-Type", "application/octet-stream")

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

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

fmt.Println(string(body))

}
HttpResponse<String> response = Unirest.post("https://snapchain-api.neynar.com/v1/validateMessage")
.header("x-api-key", "<api-key>")
.header("Content-Type", "application/octet-stream")
.body("\"<string>\"")
.asString();
require 'uri'
require 'net/http'

url = URI("https://snapchain-api.neynar.com/v1/validateMessage")

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/octet-stream'
request.body = "\"<string>\""

response = http.request(request)
puts response.read_body
{
  "valid": true,
  "message": {
    "data": {
      "fid": 2,
      "timestamp": 48994466,
      "network": "FARCASTER_NETWORK_MAINNET",
      "castAddBody": {
        "embedsDeprecated": [
          "<string>"
        ],
        "mentions": [
          2
        ],
        "text": "<string>",
        "mentionsPositions": [
          123
        ],
        "embeds": [
          {
            "castId": {
              "fid": 2,
              "hash": "0x03aff391a6eb1772b20b4ead9a89f732be75fe27"
            }
          }
        ],
        "parentCastId": {
          "fid": 2,
          "hash": "0x03aff391a6eb1772b20b4ead9a89f732be75fe27"
        },
        "parentUrl": "chain://eip155:1/erc721:0x39d89b649ffa044383333d297e325d42d31329b2"
      },
      "type": "MESSAGE_TYPE_CAST_ADD"
    },
    "hash": "0xd2b1ddc6c88e865a33cb1a565e0058d757042974",
    "hashScheme": "HASH_SCHEME_BLAKE3",
    "signature": "aSDinaTvuI8gbWludGxpZnk=",
    "signatureScheme": "SIGNATURE_SCHEME_ED25519",
    "signer": "<string>"
  }
}
{
"errCode": "<string>",
"presentable": true,
"name": "<string>",
"code": 123,
"details": "<string>",
"metadata": {
"errcode": [
"<string>"
]
}
}

Authorizations

x-api-key
string
header
default:NEYNAR_API_DOCS
required

API key to authorize requests

Body

application/octet-stream

A Message is a delta operation on the Farcaster network. The message protobuf is an envelope that wraps a MessageData object and contains a hash and signature which can verify its authenticity.

The body is of type file.

Response

A successful response.

valid
boolean
required
message
object
required

A Message is a delta operation on the Farcaster network that represents a state change. Messages are the fundamental unit of data in Farcaster and can represent various actions like:

  • Creating or removing casts (posts)
  • Adding or removing reactions
  • Following or unfollowing users
  • Updating profile data
  • Verifying Ethereum addresses

Each message contains:

  • A MessageData object with the actual content
  • A hash of the content for integrity verification
  • A cryptographic signature to prove authenticity
  • The signer's public key for verification

Messages are immutable once created and form an append-only log of all user actions on the network.