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POST
/
2
/
chat
/
conversations
/
{id}
/
members
Add members to a Chat group conversation
curl --request POST \
  --url https://api.x.com/2/chat/conversations/{id}/members \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "user_ids": [
    "<string>"
  ],
  "action_signatures": [
    {
      "encoded_message_event_detail": "<string>",
      "message_event_signature": {
        "message_signing_key_info_list": [
          {
            "member_id": "<string>",
            "public_key_version": "<string>",
            "signing_public_key": "<string>"
          }
        ],
        "public_key_version": "<string>",
        "signature": "<string>",
        "signature_version": "<string>",
        "signing_public_key": "<string>"
      },
      "message_id": "<string>",
      "signature_payload": "<string>"
    }
  ],
  "conversation_key_version": "<string>",
  "conversation_participant_keys": [
    {
      "encrypted_conversation_key": "<string>",
      "public_key_version": "<string>",
      "user_id": "<string>"
    }
  ],
  "encrypted_avatar_url": "<string>",
  "encrypted_title": "<string>"
}
'
{
  "conversation_key_change_sequence_id": "<string>",
  "current_member_ids": [
    "<string>"
  ]
}

Authorizations

​
Authorization
string
header
required

The access token received from the authorization server in the OAuth 2.0 flow.

Path Parameters

​
id
string
required

The Chat group conversation ID. Identifies the conversation target. Accepts three formats: (1) a recipient user ID for 1:1 conversations (e.g., '1215441834412953600'), (2) a legacy 1:1 conversation ID with two user IDs separated by a dash (e.g., '1215441834412953600-1603419180975409153'), or (3) a group conversation ID prefixed with 'g' (e.g., 'g1234567890123456789'). The server constructs the canonical conversation ID from the authenticated user and recipient when a single user ID is provided.

Pattern: ^([0-9]{1,19}|[0-9]{1,19}-[0-9]{1,19}|g[0-9]{1,19})$
Example:

"1215441834412953600"

Body

application/json
​
user_ids
string[]
required

List of user IDs to add to the group conversation.

User ID to add.

​
action_signatures
object[]

Cryptographic signatures for the add-members action.

​
conversation_key_version
string

Version of the new rotated conversation key.

​
conversation_participant_keys
object[]

Encrypted conversation keys for each new participant after key rotation.

​
encrypted_avatar_url
string

Re-encrypted group avatar URL with new conversation key.

​
encrypted_title
string

Re-encrypted group title with new conversation key.

Response

The request has succeeded.

​
conversation_key_change_sequence_id
string

Sequence ID of the conversation key change event.

​
current_member_ids
string[]

List of all current member IDs in the conversation.

User ID.