HeyReagent / LinkedIn API for messages

A LinkedIn API for messages, invitations and search

LinkedIn has an API for messaging, and you probably cannot use it: it is restricted to approved partners. HeyReagent is a plain API for your own LinkedIn account instead. One POST sends a message, another an invitation, another searches people. It is free to start, and it is not made by LinkedIn.

What LinkedIn's own API allows

• The Messages API page says: "Usage of this API is restricted to approved partners." It also says "member actions do not include an automated or scheduled event". LinkedIn's Messages API documentation.
• The Sales Navigator API page says: "We are not currently accepting new partners for access to the LinkedIn Sales Navigator API." LinkedIn's Sales Navigator documentation.

One call

Sign in, connect your LinkedIn, and create a key under Menu, then Developers. This sends a message to a connection:

curl -X POST https://api.heyreagent.com/v1/actions/send_message \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "content-type: application/json" \
  -d '{"profileUrl":"PASTE_PROFILE_LINK_HERE","text":"Hello!"}'

const response = await fetch("https://api.heyreagent.com/v1/actions/send_message", {
  method: "POST",
  headers: {
    "Authorization": "Bearer YOUR_KEY",
    "content-type": "application/json",
  },
  body: JSON.stringify({
    "profileUrl": "PASTE_PROFILE_LINK_HERE",
    "text": "Hello!"
  }),
});
const answer = await response.json();
console.log(answer);

import requests

response = requests.post(
    "https://api.heyreagent.com/v1/actions/send_message",
    headers={"Authorization": "Bearer YOUR_KEY"},
    json={
        "profileUrl": "PASTE_PROFILE_LINK_HERE",
        "text": "Hello!",
    },
)
print(response.json())

{
  "profileUrl": "PASTE_PROFILE_LINK_HERE",
  "text": "Hello!"
}

Every action is called the same way: a POST to https://api.heyreagent.com/v1/actions/ and its name, your key in the Authorization header, the inputs as JSON. The answer is { "ok": true, "result": { … } }, or { "ok": false, "error": "…", "message": "…" } with the reason in plain English.

What there is

97 actions. The ones most asked for:

• send_messageSend one message to a 1st-degree connection, or into an existing conversation, now.
• send_invitationSend one connection invitation, now.
• list_conversationsList the conversations in the stored copy of your inbox, across your accounts.
• get_conversationRead your whole conversation with one person.
• search_peopleSearch people on ordinary LinkedIn by plain words, a place name and connection degree.
• get_profileRead one person's profile in short, with their recent posts and their company.
• create_postPublish one post, or repost one.
• list_connectionsList your 1st-degree connections.

Every action, each with its inputs, an example call in four languages, and what comes back.

For your tools

Limits

Each LinkedIn account has a daily limit for each kind of action, built in. Reading your conversations is not limited.

All the limits, and what each refusal means.

Questions

HeyReagent is not affiliated with, endorsed by, or sponsored by LinkedIn. LinkedIn's own terms apply to your account. What this page says about other products was read on their own pages on 5 October 2026.

More guides

• LinkedIn MCP serverOne address for Claude, ChatGPT, Cursor and n8n.
• Is there an official LinkedIn MCP?No. What LinkedIn does offer, and what else exists.
• Connect Claude to LinkedInA LinkedIn connector for Claude and Claude Code.
• Connect ChatGPT to LinkedInYour own LinkedIn inside ChatGPT.
• LinkedIn in n8nMessages, invitations and search in an n8n workflow.
• Dripify alternativeAn agent that answers, beside a tool that sends sequences.
• Expandi alternativeFewer messages, each one written for the person.
• HeyReach alternativeOne account done well, beside many at scale.
• Valley alternativeTwo close products, and where they differ.
• Gojiberry alternativeTwo close products, and where they differ.