Yes. The MCP connection works on every Chat33 plan, including Free. Your plan's limits on posts and connected accounts still apply.

Do I need an API key?

No. You sign in to Chat33 in your browser and approve access. API keys still work for tools that can't sign in.

Can it post or send messages without asking me?

The setup instructions tell the agent to confirm every post and message with you first. You can see and disconnect every connected app in Settings → API Keys → Connected AI apps.

Settings → API Keys → Connected AI apps → Disconnect. The agent is signed out immediately.

Do I need a paid ChatGPT plan?

Custom connectors need ChatGPT Developer mode, which OpenAI offers on paid plans on the web. Check your plan's settings.

Chat33 + ChatGPT

Schedule posts, build DM automations and answer your inbox, right from ChatGPT.

Copy this prompt into ChatGPT

Set up Chat33 from chat33.io/chatgpt

Works on every plan, including Free.

1.In ChatGPT, open Settings → Apps / Connectors → Advanced and turn on Developer mode.
2.Click Create plugin (or Create / Add connector, depending on your version). Name: Chat33, URL: https://chat33.io/api/mcp/mcp, Authentication: OAuth.
3.Sign in to Chat33 in the browser window that opens and click Allow. Then, in a chat, enable Chat33 and paste the prompt.

Install manually

ChatGPT → Settings → Apps / Connectors → Create

Name: Chat33
MCP server URL: https://chat33.io/api/mcp/mcp
Authentication: OAuth
Client registration: automatic (dynamic)

MCP endpoint

https://chat33.io/api/mcp/mcp

The instructions ChatGPT follows

When you paste the prompt, ChatGPT reads this page and follows these steps. Nothing here is hidden.

Chat33 setup for ChatGPT. Source: https://chat33.io/chatgpt

Give only the next action for the user's current stage. Put every command in its own code block.
Never ask the user for an API key and never print OAuth URLs; sign-in happens in their browser.
No Chat33 account yet? They can create a free one at https://chat33.io/register

1. Register the server. ChatGPT can't add an MCP server by itself; the user adds it once in Settings.
If Chat33 tools are available in this chat, go to step 2. If they are not, give the user these three steps and stop:
a) Settings → Apps / Connectors → Advanced → turn on Developer mode.
b) Create plugin (or Create / Add connector): Name Chat33, URL https://chat33.io/api/mcp/mcp, Authentication OAuth.
c) Sign in to Chat33 in the browser, click Allow, then in a new chat enable Chat33 and paste "Set up Chat33 from chat33.io/chatgpt".
MCP endpoint: https://chat33.io/api/mcp/mcp
2. Sign in. If chat33 tools are already available in this session, call whoami now:
success → go to step 3; an auth error → tell the user to reconnect Chat33 in ChatGPT Settings → Apps / Connectors, sign in and click Allow, then reply done; then call whoami again.
If chat33 tools are not available in this session: tell the user to enable Chat33 for this chat (or reconnect it in Settings → Apps / Connectors) and reply done. Do not call any tool until they say it is done.
3. Verify. Call whoami, then list_accounts. If no social account is connected, send the user to
https://chat33.io/channels to connect one, then call list_accounts again. When both succeed,
say Chat33 is ready, list each connected account on its own line, then show exactly this menu:

Choose your first task — reply with a number:
1. Write and schedule a post
2. Create a comment → DM automation
3. See how my recent posts performed
4. Check my Instagram / Facebook inbox
5. Reply to comments on a post

4. For every task: confirm platform, account, text and time (with timezone) before creating a post;
call validate_post before create_post. create_flow makes an automation as a draft; call
set_flow_status with ACTIVE only when the user asks to switch it on.
Never send a DM or comment reply without first showing the exact text and recipient and getting approval.
DM replies only work within 24 hours of the contact's last message.
5. Finish with a verified result: show the scheduled time, automation status or sent message the tool returned.
If only setup is done, say the connection is ready. Do not claim a task ran.

Reference: tools https://chat33.io/mcp · REST API https://chat33.io/llms.txt

Questions

Is it free?: Yes. The MCP connection works on every Chat33 plan, including Free. Your plan's limits on posts and connected accounts still apply.
Do I need an API key?: No. You sign in to Chat33 in your browser and approve access. API keys still work for tools that can't sign in.
Can it post or send messages without asking me?: The setup instructions tell the agent to confirm every post and message with you first. You can see and disconnect every connected app in Settings → API Keys → Connected AI apps.
How do I disconnect?: Settings → API Keys → Connected AI apps → Disconnect. The agent is signed out immediately.
Do I need a paid ChatGPT plan?: Custom connectors need ChatGPT Developer mode, which OpenAI offers on paid plans on the web. Check your plan's settings.

Create a free account See every tool