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.

Does it work in Claude Desktop and claude.ai too?

Yes. Add Chat33 as a custom connector with the URL above and click Connect; you'll sign in the same way.

Chat33 + Claude

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

Copy this prompt into Claude

Set up Chat33 from chat33.io/claude

Works on every plan, including Free.

1.Paste the prompt into Claude Code. It adds Chat33 for you.
2.Open a new terminal tab, run claude /mcp, pick chat33 → Authenticate and approve in your browser.
3.Paste the same prompt in the new chat. Claude checks your accounts and asks what to do first.

Install manually

Claude Code

claude mcp add --transport http --scope user chat33 https://chat33.io/api/mcp/mcp

Claude Desktop / claude.ai

Settings → Connectors → Add custom connector
Name: Chat33
URL: https://chat33.io/api/mcp/mcp

MCP endpoint

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

The instructions Claude follows

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

Chat33 setup for Claude Code (for Claude Desktop or claude.ai, tell the user to add a custom connector with the endpoint below and click Connect, then continue at step 3). Source: https://chat33.io/claude

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. Run `claude mcp get chat33`. If it is already registered, go to step 2. If it is missing, run:
claude mcp add --transport http --scope user chat33 https://chat33.io/api/mcp/mcp
Registration is not sign-in, and this session cannot load a server added during it. Tell the user:
open a new terminal tab, run `claude /mcp`, choose chat33 → Authenticate, approve in the browser,
then paste "Set up Chat33 from chat33.io/claude" in that new session. Stop here.
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 type /mcp, choose chat33 → Authenticate, approve in the browser and reply done; then call whoami again.
If chat33 tools are not available in this session: tell the user to type /mcp, choose chat33 → Authenticate, approve in the browser 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.
Does it work in Claude Desktop and claude.ai too?: Yes. Add Chat33 as a custom connector with the URL above and click Connect; you'll sign in the same way.

Create a free account See every tool