ChatGPT MCP: How to Add an MCP Server to ChatGPT
Yes, ChatGPT supports MCP. On ChatGPT web you add a custom MCP server as a plugin by entering its public HTTPS URL, then choose how it authenticates. Per OpenAI, full MCP support, including write actions, is for Business, Enterprise and Edu. For a Moby Agent, ChatGPT: works on Business, Enterprise and Edu workspaces that allow custom MCP servers (web). In ChatGPT, paste your personal Moby connector URL from the app.
Does ChatGPT support MCP?
Yes. MCP is a standard way for an AI app to call outside tools. ChatGPT can add a server you name, within the plan rules OpenAI publishes. The basics of the protocol for trading tools are on MCP for trading. This page is the ChatGPT sibling of Codex MCP and Claude Code MCP.
Which ChatGPT plans can use custom MCP servers
Per OpenAI's help center, as of November 3, 2026. Re-check the article before you rely on a row. OpenAI changes this often.
| Plan | Custom MCP servers per OpenAI's help center |
|---|---|
| Business, Enterprise, Edu (web) | "Custom MCP server connections and full MCP support" |
| Pro | Can connect custom MCP servers "with read/fetch permissions." That is OpenAI's rule. It is not a Moby trading plan. |
| Moby connector | ChatGPT: works on Business, Enterprise and Edu workspaces that allow custom MCP servers (web). In ChatGPT, paste your personal Moby connector URL from the app. |
| Other plans | Not covered here; check OpenAI's help article |
Notes per OpenAI: web only, not the mobile apps. Local servers are not connected directly (use OpenAI's Secure MCP Tunnel). Write actions may ask you to confirm.
How to add a custom MCP server in ChatGPT
These steps follow OpenAI's help article for the current Plugins flow, which is what people mean by chatgpt add mcp server, how to add mcp to chatgpt, and chatgpt mcp server. Screen names can move. Follow the labels OpenAI shows you.
- Open ChatGPT on the web and go to Plugins.
- Click + and choose Add custom MCP server.
- Enter the server's public HTTPS URL, or set up a Secure MCP Tunnel for a server on your own machine.
- Pick the authentication the server uses.
- Read and accept the risk notice.
- Create it as a plugin, then turn it on in a chat.
Do you need developer mode?
Per OpenAI's current help article, Developer Mode is not required for this flow. Some providers' guides still describe a Developer Mode path. Robinhood's agent guide references Settings, Security and login, Developer Mode, Plugins. Both descriptions exist in the wild. Follow OpenAI's current screens for your plan. Chatgpt developer mode is a settings path, not a second protocol.
Connectors, apps and plugins: what is the difference?
Per OpenAI, ChatGPT's built-in apps and connectors are made by OpenAI or partners. A custom MCP server, a chatgpt connector or chatgpt mcp connector, is one you add by URL. Developers who want to ship their own app use the Apps SDK. One sentence is enough here: that SDK is how a company builds a ChatGPT app, and OpenAI's developer docs are the spec. This page is about connecting a server you already have.
MCP in the ChatGPT desktop app and Codex
Per learn.chatgpt.com, the ChatGPT desktop app, Codex CLI and the IDE extension share one config file, ~/.codex/config.toml. Add servers in Settings, MCP servers, Add server (STDIO or Streamable HTTP), or with codex mcp add. The docs describe bearer tokens via an environment variable and OAuth as options in that Codex config. OAuth there is Codex's option for servers that use it. Moby's agent key is a Bearer key. The walkthrough is Codex MCP and Codex setup.
Staying safe with MCP in ChatGPT
Only add servers you trust. Read what tools a server exposes. Keep write actions on confirm. Never paste API keys or wallet keys into chat. For anything that moves money, use a separate account or wallet with limits enforced on the server side. AI agent security and AI agent guardrails are the longer checklists.
Example: trading from ChatGPT with MCP
Several trading products offer MCP access. Check each provider's docs for which ChatGPT plans they support. A chatgpt trading bot, chatgpt stock trading prompt, or chatgpt crypto trading idea can stay in the chat as research. The order needs a server your workspace is allowed to call. The full trading guide is how to use ChatGPT for trading.
With Moby: Connect it from Codex, Claude Code (CLI), Gemini CLI (with a paid Gemini API key or enterprise access) and Grok CLI, with the agent key. In ChatGPT, paste your personal Moby connector URL from the app. ChatGPT: works on Business, Enterprise and Edu workspaces that allow custom MCP servers (web). Moby Agents trade Solana tokens, paid in USDC, including tokenized stocks. Examples: AAPLx, NVDAx and SPYx. See tokenized stocks. Each user gets one agent, with its own wallet separate from your main in-app wallet. The agent cannot withdraw or send funds. You set your agent's limits on max per trade, daily buy volume and market-cap range from the Moby app, and Moby checks them server-side on every buy your agent makes. Tell your agent your exits and it places real take-profit and stop-loss orders on Moby, including a one-call bracket. A plain prompt, with no promise about the result: "Check the rug check on this token, then buy $20 of it if it passes, with a take-profit at 2x and a stop-loss at 30% down." The rug check is one tool the agent can read first. Setup starts at Moby Agents and the Moby MCP.
Frequently asked questions
Does ChatGPT support MCP?
Yes. On ChatGPT web you can add a custom MCP server as a plugin. Per OpenAI, full MCP support, including write actions, is for Business, Enterprise and Edu, and Pro users can connect custom servers with read and fetch permissions. That Pro note is OpenAI's rule for ChatGPT. It is not a Moby plan. For Moby, ChatGPT: works on Business, Enterprise and Edu workspaces that allow custom MCP servers (web). Check OpenAI's help center for your plan.
How do I add an MCP server to ChatGPT?
Per OpenAI, open Plugins on ChatGPT web, click +, choose Add custom MCP server, enter the server's public HTTPS URL or set up a Secure MCP Tunnel, pick the authentication, accept the risk notice and create it as a plugin. Then turn it on in a chat.
Do I need ChatGPT developer mode for MCP?
Per OpenAI's current help article, the custom MCP server flow does not require Developer Mode. Some provider guides still describe a Developer Mode path in settings. Follow the screens OpenAI shows for your plan today.
Can I use a local MCP server with ChatGPT?
Not directly on ChatGPT web. OpenAI says to use its Secure MCP Tunnel for a server on your own machine. The ChatGPT desktop app and Codex can run local STDIO servers through the shared Codex config file.
What is the difference between MCP and an API?
An API is a way for software to call a service. MCP is a standard that wraps tools, often built on APIs, so any MCP-capable AI app can discover and call them in the same way, without custom code for each app.
Is MCP just tool calling?
MCP uses tool calling, but it is more than that. It is an open protocol for how an AI app finds a server's tools, calls them and gets results back, so the same server works across many AI apps.
Can I trade from ChatGPT with MCP?
Yes, if a trading service offers an MCP connection and your workspace allows its actions. With Moby, paste your personal Moby connector URL from the app. ChatGPT: works on Business, Enterprise and Edu workspaces that allow custom MCP servers (web). Your agent trades Solana tokens, paid in USDC, including tokenized stocks, within limits you set.
Try it with a Moby Agent
Set up a Moby Agent with its own wallet and your spending guardrails, then connect it to the AI you use.
You set your agent's limits on max per trade, daily buy volume and market-cap range from the Moby app, and Moby checks them server-side on every buy your agent makes.
Moby Agents trade Solana tokens, paid in USDC, including tokenized stocks.
Each user gets one agent, with its own wallet separate from your main in-app wallet. The agent cannot withdraw or send funds.
Connect it from Codex, Claude Code (CLI), Gemini CLI (with a paid Gemini API key or enterprise access) and Grok CLI, with the agent key. In ChatGPT, paste your personal Moby connector URL from the app. ChatGPT: works on Business, Enterprise and Edu workspaces that allow custom MCP servers (web).
Tell your agent your exits and it places real take-profit and stop-loss orders on Moby, including a one-call bracket.
A 0.75% swap fee (minimum $0.90 per swap), plus onchain fees.
10% of the Moby fee back in $MOBY on every swap, 20% after your first swap, up to 30% as you climb tiers.
Start at Moby Agents. The product frame is agentic trading.
Trading crypto and tokenized stocks is risky and you can lose money. Nothing on this page is investment advice. Facts about other products are from their own sites as of November 3, 2026; check them for current details.