UnderChat MCP server

List WhatsApp chats, contacts and sectors; send, transfer and label chats in UnderChat. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.

Connect UnderChat50 free tool calls a month

What can I ask?

Turn on the UnderChat connector, then ask in plain words. The AI picks the tools.

What you can do with UnderChat in Claude and ChatGPT

For customer support teams that answer WhatsApp chats in UnderChat.

See which chats wait in the queue

List the chats in the queue, or the chats assigned to you. Count the unread messages with the unread summary.

Read the history of a customer chat

Search the chats by contact name or phone. Read the messages of a chat, or search one chat for a word.

Answer a customer on WhatsApp

Send a text message into an existing chat, as the active user. The customer receives it on WhatsApp.

Changes data

Hand a chat to a sector and label it

Transfer a chat to another channel, user or sector. Then set the labels and check the chat, because the API does not say whether labels are replaced or added.

Changes data

Create a contact for a new lead

Check the contact by phone first, to see whether the number already exists. Then create the contact with a name and a phone number.

Changes data

How do I connect UnderChat?

Before you connect

The login page asks for your UnderChat API token and Active user id (UUID).

Create the token in UnderChat → Integração → API pública → Gerar token. The user id is the UUID of an active user in your account; permissions, sectors and channels are checked for that user on every call. Your token is used only to call the API on your behalf and to derive a private account id.

Claude claude.ai · Desktop

  1. Open Customize → Connectors, then click + Add → Add custom connector.
  2. Enter the name UnderChat and this URL, then click Add:
    https://underchat.usefulapi.io/mcp
  3. Claude opens the login page: enter your UnderChat API token and Active user id (UUID).
  4. In a chat, click + → Connectors and turn on UnderChat.

Team and Enterprise: an Owner adds the connector for the organization first.

ChatGPT chatgpt.com

  1. Open Plugins, click +, then Add custom MCP server.
  2. Enter the name UnderChat and this URL, choose OAuth as the authentication, confirm the warning and create it:
    https://underchat.usefulapi.io/mcp
  3. ChatGPT opens the login page: enter your UnderChat API token and Active user id (UUID).
  4. In Plugins, install UnderChat, then choose it in a chat.

No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.

Claude Code

Run this command, then run /mcp in Claude Code to log in:

claude mcp add --transport http underchat https://underchat.usefulapi.io/mcp

Cursor

Add to Cursor or add this to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "underchat": {
      "url": "https://underchat.usefulapi.io/mcp"
    }
  }
}

VS Code

Add to VS Code or add this to .vscode/mcp.json:

{
  "servers": {
    "underchat": {
      "type": "http",
      "url": "https://underchat.usefulapi.io/mcp"
    }
  }
}

Codex

Run these commands. The second one opens the login page:

codex mcp add underchat --url https://underchat.usefulapi.io/mcp
codex mcp login underchat

Other clients

Windsurf, Cline, Zed and other MCP clients: add this URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser.

https://underchat.usefulapi.io/mcp

Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your UnderChat API token and Active user id (UUID). If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.

Pricing

PlanPriceLimit
Free$050 tool calls / month
Proper user$9/mo · $90/yr10,000 tool calls / month
Pro+per user$39/mo · $390/yr100,000 tool calls / month

Each paid plan covers this UnderChat server only. Ask your AI to run underchat_upgrade and choose Pro or Pro+, billed monthly or yearly (it returns a Stripe Checkout link). If you already have Pro, ask to change it to Pro+. The change requires your confirmation, keeps your billing interval and charges the price difference for the rest of the period immediately. Cancel any time with underchat_cancel_subscription: your paid plan continues to the end of the paid period, with no refund for the current period, and asking to resume the same plan with underchat_upgrade before then undoes the cancel. Or write to support@usefulapi.io.

Tools 25

Show all 25 tools (the AI picks them for you)

Read only · 15

  • List chatsunderchat_list_chats
    List conversations in one state (my_chats = the executor's own chats; or queue, in_chat, closed, and so on), with optional filters.
  • Search chatsunderchat_search_chats
    Search conversations by contact name or phone.
  • Get chat messagesunderchat_get_chat_messages
    Read the message history of one chat, newest first, with paging.
  • Search messages in a chatunderchat_search_chat_messages
    Search the messages of one chat for a text.
  • Get chat detailsunderchat_get_chat_details
    Get one chat with its state, assigned channel, user, sector and labels.
  • Get unread summaryunderchat_get_unread_summary
    Count the unread messages for the executor.
  • List channelsunderchat_list_channels
    List the account's channels (for example WhatsApp numbers) with their status. Use the ids as channel or worker ids in other tools.
  • List workersunderchat_list_workers
    List the workers (channels) that can receive or transfer a chat, for filters and transfers.
  • List contactsunderchat_list_contacts
    List the account's chat contacts with paging and filters.
  • Get a contactunderchat_get_contact
    Get one chat contact by id.
  • Find a contact by phoneunderchat_find_contact_by_phone
    Find the chat contact that has a phone number.
  • List label templatesunderchat_list_label_templates
    List the label templates (etiquetas) of the account.
  • List sectorsunderchat_list_sectors
    List the sectors (setores) of the account.
  • List usersunderchat_list_users
    List the users (attendants) of the account with paging and filters.
  • Get a userunderchat_get_user
    Get one user of the account by id, with the status and access group.

Changes data · 6

  • Send a text messageunderchat_send_text_message
    Send a WhatsApp text message into an existing chat, as the executor. The customer receives it. POST /chat/{chat_id} with type=text.
  • Change a chat statusunderchat_update_chat_status
    Move a chat to another state, for example closed, queue or in_chat. Closing ends the attendance for the customer.
  • Transfer a chatunderchat_transfer_chat
    Transfer a chat to another worker (channel), user or sector. Set at least one of worker_id, user_id or sector_id.
  • Set chat labelsunderchat_set_chat_labels
    Send a list of label template ids to a chat. The API decides whether the list replaces or adds to the current labels; check the chat after the call.
  • Create a contactunderchat_create_contact
    Create a chat contact with a name and a phone number.
  • Update a contactunderchat_update_contact
    Change the fields you send for one chat contact. Fields you omit stay as they are.

Your usefulapi plan · 4

  • Usage status (free-tier meter)underchat_usage_status
    Report the caller's current usage: the plan, calls used this month, the limit of the plan (the free monthly cap or the Pro fair use limit), remaining, and whether the limit is reached. Read-only; does not count against the meter.
  • Request a missing featureunderchat_request_feature
    Tell usefulapi that the user needs something the UnderChat tools cannot do yet (a missing tool, field or filter). Call it only when the user asks for something none of the tools can do, and tell the user that you send the request. Do not call it for errors or for normal requests. Do not include personal data, credentials or customer records. Stored with the product name and the client type (for example Claude or Cursor), without the user's account. At most 5 requests per day. Does not count against the meter.
  • Upgrade to Pro or Pro+underchat_upgrade
    Get a paid plan for UnderChat (the free tier caps monthly usage). Pro: 10,000 tool calls a month, for normal use — plan "monthly" ($9/month) or "yearly" ($90/year, 2 months free). Pro+: 100,000 tool calls a month, for automations and heavy use — plan "plus" ($39/month) or "plus_yearly" ($390/year). Without a plan it returns both Pro and Pro+, each with a payment link, for the user to choose; with a plan, one link. An existing Pro subscription changes to Pro+ in place: call without confirm first, as the reply states the exact charge for this account (the price difference for the rest of the period, or in a free Pro trial the full Pro+ price, as the trial ends); then call with confirm: true. Cancel any time: the plan then runs to the end of the paid period, so it also suits a one-time job. A link opens Stripe Checkout in the browser; after payment the account upgrades automatically. Does not count against the meter.
  • Cancel the Pro subscriptionunderchat_cancel_subscription
    Cancel the caller's UnderChat Pro subscription at the end of the paid period (no refund for the current period; Pro continues until then, then the free tier applies). Requires confirm: true. Run underchat_upgrade later to undo the cancel before the period ends. Does not count against the meter.

FAQ

What can I do with UnderChat in Claude or ChatGPT?

See which chats wait in the queue. Read the history of a customer chat. Answer a customer on WhatsApp. Hand a chat to a sector and label it. Create a contact for a new lead. See what you can do for the details.

Is this an official UnderChat product?

No. usefulapi is an independent service. It is not affiliated with or endorsed by UnderChat. The server calls the UnderChat API with your own UnderChat access, so it sees only the data that your account can see.

Can I connect UnderChat to Claude or ChatGPT?

Yes. In Claude, add this server's URL as a custom connector. In ChatGPT, add it as a custom MCP server in Plugins. Then log in once. Cursor, VS Code, Claude Code and Codex work too. See the setup steps.

What do I need to connect?

The login page asks for your UnderChat API token and Active user id (UUID). See Before you connect for where to find them.

Do I put my UnderChat key or an Authorization header in the client config?

No. Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your UnderChat API token and Active user id (UUID). If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.

How do you keep my UnderChat credentials?

The login stores them encrypted in the authorization grant of your connection. The server uses them to call the UnderChat API for you and to derive a private account id for usage metering. usefulapi does not show them on any page or in any reply. To stop all access, remove the connector and change or delete these credentials in UnderChat.

Can the AI change my UnderChat data?

Yes, if you approve it. 6 of the 21 UnderChat tools can create or change data. The other 15 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.

What does it cost?

The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with 10,000 tool calls / month. Pro+ costs $39/mo or $390/yr, with 100,000 tool calls / month. Each subscription covers this UnderChat server only. Cancel any time: your paid plan then runs to the end of the paid period. Run underchat_usage_status to see how many calls you used.

How do I subscribe or cancel?

Ask the AI to run underchat_upgrade and choose Pro or Pro+, billed monthly or yearly: it returns a Stripe Checkout link. If you already have Pro, ask to change it to Pro+. After you confirm, your existing subscription changes in place, keeps its billing interval and charges the price difference for the rest of the period immediately. To cancel, run underchat_cancel_subscription. Your paid plan continues to the end of the paid period.

What if a UnderChat tool that I need is missing?

Tell the AI what you wanted to do. It can send the request with underchat_request_feature. We store the text with the server name, the type of AI client and the tool you tried, not with your account, and read every request when we plan new tools. You can send up to 5 requests per day.

Which AI clients can I use?

Any client that supports remote MCP servers (Streamable HTTP) with OAuth login: Claude (web and desktop), Claude Code, ChatGPT, Codex, Cursor, VS Code, Windsurf and others.

This is a Model Context Protocol endpoint — meant to be connected from an AI client, not opened in a browser. An invalid_token response at the URL is the auth gate working as designed; clients authenticate automatically.

Need a tool this server does not have, or a connection to another system? We build custom integrations and MCP servers.

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