postevi
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There are three ways to use postevi in n8n: MCP as a tool for your agent, the REST API for plain requests, and outgoing webhooks to start workflows on events. The MCP route signs in with OAuth; the REST route uses an API key.

All integrations

MCP Client Tool

The AI Agent node uses postevi's tools like any of its own.

  1. Add a tool to the AI Agent node in your workflow and pick MCP Client Tool.
  2. Enter the MCP server URL in the node's endpoint field.
    https://postevi.app/api/mcp
  3. Under Authentication, create a new MCP OAuth2 credential and leave Use Dynamic Client Registration on.
  4. Save the credential, sign in to postevi and pick a workspace.
  5. Under Tools to Include, pick the tools the agent may use.

HTTP Request and the REST API

Plain requests go straight to the REST API with an API key.

  1. Create an API key on the AI page of the dashboard with only the permissions the workflow needs.
  2. Enter the method and URL in the HTTP Request node, for example to list scheduled posts.
    GET https://postevi.app/api/v1/posts?status=scheduled&limit=20
Authorization: Bearer postevi_sk_...
  3. Set the Authorization header to Bearer followed by the key.
    Authorization: Bearer postevi_sk_...
  4. Add an Idempotency-Key header to POST requests, so a retried request only does the work once.

Webhook trigger

An event in postevi starts a workflow in n8n.

  1. Start a new workflow with a Webhook node in n8n and copy the node's URL.
  2. On the AI page of the dashboard, open the Webhook tab, select Add endpoint, paste the URL and pick the events.
  3. Save the signing secret, which you'll see only once, and verify each request with the webhook-signature header.
    POST /webhook/postevi HTTP/1.1
Host: n8n.example.com
Content-Type: application/json
webhook-id: msg_2pWzqf8Lr1Tn4Vb7Kx9Yc3Ad
webhook-timestamp: 1794301200
webhook-signature: v1,K5oZfzN95Z9UVu1EsfQmfVNQhnkZ2pj9o9NDN/H/pI4=

{
  "type": "post.published",
  "timestamp": "2026-11-10T09:00:00Z",
  "data": {
    "postId": "post_01JCX4M8Q2R7T9V3W5Y6Z8A1B2",
    "status": "published"
  }
}
  4. Use Send test event to try the workflow.
  • The name of the endpoint field in MCP Client Tool depends on your n8n version.
  • Event names, signature details and permissions are on the Developers page.

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