Grok + PostAxis

Schedule social media posts with Grok

Grok’s connectors take a URL, so PostAxis uses a key in the link. Paste it once and Grok can schedule posts across every channel you run.

One URL with your API key
Posts to 8 networks, not just X
Treat the URL like a password

Connect Grok Start for $0

Set up Grok with PostAxis

Plug PostAxis into Grok once, then talk to it like you would to whoever runs your accounts. Every click is in the full guide below.

Plug in about 3 minutes

Step 1 of 2

Connect Grok with a key URL

Grok’s connectors take a single URL, so PostAxis uses an API key inside the link. Create the key first (needs the API add-on).

PostAxis account
A connected social account
Grok installed
API add-on

Connector URL

https://postaxis.io/api/mcp?key=YOUR_API_KEY

The key is inside the URL, so keep it private and revoke it from the API keys page if it leaks.

Talk

Step 2 of 2

Then tell Grok what you need

Grok picks the PostAxis tools it needs. Scheduled posts go out on time whether or not the chat is still open.

Try asking

Which accounts can you post to?
What goes out this week?
Keep that one as a draft

Write a post about today’s launch and schedule it on X and LinkedIn for 9:00.

Scheduled for 9:00: one X post and one LinkedIn post. Both passed the rules check.

via PostAxis

Example answer · lands in your PostAxis calendar

Full setup guide for Grok

Every step from a new PostAxis account to your first scheduled post. Takes about 3 minutes once your accounts are connected. Want ready-made workflows? Read the full Grok guide

1
Create your PostAxis account
Sign up at app.postaxis.io. Every plan starts with a 7-day free trial and includes MCP access with OAuth sign-in. Create an account
2
Connect your social accounts
Open Accounts in PostAxis and connect the networks you want to post to: Instagram, TikTok, YouTube, X, LinkedIn, Facebook, Threads or Telegram. Your agent can only post to accounts connected here, and it never sees your social media passwords. Open Accounts
3
Create an API key
In PostAxis open Settings → API keys and click Create API key. Copy it; it is shown only once. This needs the API add-on.
4
Build your connector URL
Replace YOUR_API_KEY with the key you copied.
Copy this
```
https://postaxis.io/api/mcp?key=YOUR_API_KEY
```
5
Add the connector in Grok
In Grok, add a new connector (MCP server) and paste the URL.
6
Ask Grok to post
Ask “Which accounts do I have connected?”, then ask for a post.

What can Grok do with PostAxis?

Everything PostAxis does in the dashboard that makes sense to do by asking: writing, scheduling, editing, publishing and checking your queue.

Sentences in, posts out

Describe the post in your own words. Grok turns it into posts and PostAxis handles the scheduling.

Every network you run

Instagram, TikTok, YouTube, X, LinkedIn, Facebook, Threads and Telegram, from a single message.

Checked before it’s saved

Caption length, media count, video length and format are checked for every network before anything is saved.

Weeks ahead in one go

Ask for a week or a month. Grok can dry-run up to 50 posts at once, show you the plan, then schedule it.

Your images and video

Attach images and videos from a link, or get a one-time upload link for files on your computer.

A key you can revoke

Grok uses an API key you create and can revoke at any time. It only reaches accounts connected in your PostAxis workspace.

What is Grok?

Grok is xAI’s AI assistant on grok.com, X and its mobile apps. Its connectors can call remote MCP servers by URL.

With PostAxis connected, Grok can write a post and schedule it to X and seven other networks from the same conversation.

What can you ask Grok to post?

Brief it like a person: what it’s about, where it goes, when. Four requests that work well with Grok:

Launch day
Tell people what’s new
Our CSV export is live. One line for X, a short paragraph for LinkedIn, both out tomorrow morning at 9:00.
To Grok
Calendar
Fill next week
Next week is empty. Give me one post a day at 10:00 for X, LinkedIn and Threads, built around our pricing update. Let me see the list first.
To Grok
Right now
Post an update immediately
The outage is fixed. Post a short all-clear to our Telegram channel and Facebook page now and confirm when both are up.
To Grok
Photo
Put a photo out tonight
Here’s the link to today’s product shot. Instagram and Threads at 18:00, a two-line caption, no more than three hashtags.
To Grok

How does Grok talk to PostAxis?

Through MCP, the Model Context Protocol: an open standard for giving AI apps tools. PostAxis runs an MCP server; Grok connects to it and gets 11 tools that work on your account, nothing more. Full MCP reference

From your message to a scheduled post

What happens between you hitting enter and the post showing up in your calendar.

You write one message: what, where, when
Grok looks up your accounts and the limits of each network you named
It drafts a version per network and sends them to PostAxis
PostAxis checks every version and saves it as scheduled, a draft or live
The post sits in your calendar, editable until it goes out

Grok + PostAxis

Server: https://postaxis.io/api/mcp
Transport: Streamable HTTP
Sign-in: API key (Bearer)

Tools Grok discovers

list_workspacesYour PostAxis workspaces
list_accountsConnected social accounts per workspace
get_platform_rulesCaption limits and media rules per network
upload_media_from_urlPull an image or video into your media library
create_upload_linkOne-time link for uploading a local file
create_postDraft, schedule or publish one post
create_posts_bulkSchedule up to 50 posts in one call
list_postsPosts by status or date range
get_postOne post with its per-network status
update_postEdit text, media or time before it goes out
delete_postRemove a draft or scheduled post

Why does Grok need an API key?

Grok’s connectors take a single URL, so PostAxis reads the key from the link (?key=…). Create it under Settings → API keys and treat the URL like a password.

Does Grok write a different version for each network?

It can, and it should: X counts characters, LinkedIn rewards a longer read, Telegram has no title. Name the networks in one request and Grok sends one post with a version per network. PostAxis rejects any version that breaks that network’s limits before it is saved.

Share the 2.0 release with the screenshot from our blog: a punchy line on X, a short story on LinkedIn, the full changelog on Telegram. All at 14:00.

Done. Here’s what I did:

X: 1 post, 212 characters, screenshot attached
LinkedIn: 1 post, 4 short paragraphs, screenshot attached
Telegram: the full changelog, screenshot attached
Scheduled together for 14:00, one post ID

via PostAxis

Example conversation

How does Grok sign in to PostAxis?

Grok signs in to PostAxis, never to your social networks. Your Instagram, X or LinkedIn accounts stay connected to PostAxis, and you can revoke Grok’s access at any time.

API add-on✓ Used by Grok

API key

Create a key under Settings → API keys
Send it as Authorization: Bearer KEY, or in the URL for clients that only take a URL
Revoke the key any time and access stops at once

Best for servers and automations with no browser: n8n, Grok, Manus, headless agents

Every plan

OAuth sign-in

Grok opens the PostAxis sign-in in your browser
You log in and click Approve
It gets access to your account only, until you revoke it

Best for apps you use yourself: ChatGPT, Claude, Cursor, Codex and most others

If something doesn’t work

The most common problems when connecting Grok, and how to fix them.

Is a key in the URL safe?

Treat the whole URL like a password. If it leaks, revoke the key under Settings → API keys and create a new one.

The agent says no accounts are connected

Connect at least one social account under Accounts in PostAxis. If you use several workspaces, tell the agent which one, for example “use my Acme workspace”.

401 Unauthorized or “sign in again”

The sign-in expired or was revoked. Reconnect from your agent (it opens the PostAxis sign-in again). With an API key, check the key is still active under Settings → API keys.

A post was rejected before saving

PostAxis checks each network’s rules first: caption length, media count, video length and format. The error says what to change; ask the agent to fix it and try again.

Posts are scheduled at the wrong time

Say the timezone in your request, for example “9:00 Europe/Berlin”. Without one, the agent uses the timezone it was told or UTC.

I want to stop an agent from posting

Open Settings → API keys in PostAxis. Revoke the agent under Connected agents, or revoke its API key. It loses access immediately.

Grok and PostAxis: questions

Why does Grok need an API key?

Grok’s connector only accepts a URL and has no sign-in step, so the key travels in the URL. Clients with OAuth (ChatGPT, Claude, Cursor) don’t need a key.

What is the PostAxis MCP server?

It’s a remote Model Context Protocol server at https://postaxis.io/api/mcp that gives AI agents 11 tools to list your accounts, upload media and create, schedule, edit and delete posts in PostAxis.

Which social networks are supported?

Instagram (posts, Reels, carousels), TikTok (videos and photo posts), YouTube Shorts, X, LinkedIn, Facebook Pages, Threads and Telegram channels.

How much does it cost?

MCP access with OAuth is included in every PostAxis plan, and every plan starts with a 7-day free trial. API keys need the API add-on.

What stops an agent from posting something wrong?

PostAxis checks every post against each network’s rules before saving, the agent can preview bulk plans without saving them, everything shows up in your calendar, and you can revoke an agent at any time in Settings → API keys.