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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>"'
{
  "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>"
  }
}

Documentation Index

Fetch the complete documentation index at: https://docs.neynar.com/llms.txt

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

Authorizations

ā€‹
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.

ā€‹
valid
boolean
required
ā€‹
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.