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POST
/
v2
/
messages
Send Message
curl --request POST \
  --url https://api.linkupapi.com/v2/messages \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <x-api-key>' \
  --data '
{
  "account_id": "<string>",
  "action": "<string>",
  "params": {
    "profile_url": "<string>",
    "message_text": "<string>",
    "media_link": "<string>",
    "media_file": {
      "data": "<string>",
      "filename": "<string>"
    },
    "media_path": "<string>"
  }
}
'
{
  "success": true,
  "data": {
    "entityUrn": "urn:li:messagingMessage:abc123",
    "conversation_id": "2-YWJjMTIz",
    "deliveredAt": "2026-03-24T12:00:00Z"
  },
  "metadata": {
    "action": "send",
    "account_id": "your-account-id",
    "credits_consumed": 1,
    "timestamp": "2026-03-24T12:00:00Z"
  }
}

​
Overview

Sends a message to a user identified by their profile URL. You can include text only, or attach media via a URL, base64-encoded file, or server-side path.
This endpoint consumes 1 credit for text-only messages and 2 credits when media is attached.
When multiple media options are provided, the priority order is: media_link > media_file > media_path. Only one media attachment will be used.

​
Request

​
x-api-key
string
required
Your API key for authentication.
​
account_id
string
required
The unique identifier of the account to use.
​
action
string
required
Must be "send".
​
params
object
required

​
Response

​
success
boolean
Indicates whether the request was successful.
​
data
object
Details of the sent message.
​
metadata
object
{
  "success": true,
  "data": {
    "entityUrn": "urn:li:messagingMessage:abc123",
    "conversation_id": "2-YWJjMTIz",
    "deliveredAt": "2026-03-24T12:00:00Z"
  },
  "metadata": {
    "action": "send",
    "account_id": "your-account-id",
    "credits_consumed": 1,
    "timestamp": "2026-03-24T12:00:00Z"
  }
}