Matrix / Cold Email & Outreach / Reply.io

Reply.io MCP server

Cold Email & Outreach · remote · Up · auth · Docs + endpoint checked 2026-10-16

Reply.io has an official hosted MCP server at https://mcp.reply.io/. It uses API key (Bearer); OAuth for clients without header support over Streamable HTTP. Agents can use: Sequences (search, start/pause, enroll contacts), Contacts (search, create, update, blacklist), Unified inbox (list threads, send replies). Last checked 2026-10-16 10:06 PT: Up · auth.

Works in: ClaudeChatGPTClaude CodeCursor
Sources: Claude · ChatGPT · Claude Code · Cursor, checked 2026-10-16
Access: Read + write
Credits: Credits not confirmed
Plan: Not confirmed
Setup: Self-serve
No admin step in the vendor's setup notes. Source: docs.reply.io, checked 2026-10-16
Useful for: SDRs, RevOps, Sales leaders

Reply.io MCP endpoint and transport

https://mcp.reply.io/

Transport: Streamable HTTP
Docs: Official Reply.io MCP docs

Connect Reply.io without code

Reply.io's docs confirm it works in Claude and ChatGPT. You don't need a terminal or a config file. Check Reply.io's docs first: some vendors give you a personal URL or an API key to use in place of the plain endpoint.

Claude (web and desktop app)

If Reply.io shows up when you browse connectors in Claude, connect it from there instead. That skips steps 2 to 4.

In Claude, open Customize → Connectors.
Click + Add, then Add custom connector.
Name it “Reply.io”, paste the server URL https://mcp.reply.io/, and click Continue.
Review the sign-in settings Claude detected and click Add.
Click Connect and sign in to Reply.io. Then ask Claude something like “What can the Reply.io connector do?”

On Team and Enterprise plans, an Owner adds the connector first under Organization settings → Connectors → Add → Custom → Web. Each person then connects it from Customize → Connectors. Free plans can add one custom connector.

Steps from the Claude Help Center: support.claude.com, checked 2026-10-16

ChatGPT

If Reply.io has its own plugin in ChatGPT's directory, install that instead.

Go to chatgpt.com/plugins.
Select +, then Add custom MCP server. If you don't see it, your plan or workspace settings may not allow custom servers, so ask your workspace admin.
Enter a name and description. Under Connection, paste the server URL https://mcp.reply.io/.
Set up sign-in, read the warning, and select I understand and want to continue.
Select Create as a plugin. In a new chat, type @ and pick Reply.io.

Steps from the OpenAI developer docs: developers.openai.com, checked 2026-10-16

From Reply.io's docs: Claude and ChatGPT UI/desktop apps connect by URL with OAuth, which grants all scopes; header-capable clients should use a scoped personal API key. Team and Organization API keys are not supported.Source: docs.reply.io, checked 2026-10-16

Developer setup (Claude Code, Cursor)

Add this to .mcp.json (Claude Code, project root) or ~/.cursor/mcp.json (Cursor). Remove the // comment line if your client requires strict JSON.

{
  "mcpServers": {
    "reply.io": {
      "url": "https://mcp.reply.io/"
      // headless alternative: "headers": { "Authorization": "Bearer YOUR_REPLY.IO_API_KEY" }
    }
  }
}

Add the endpoint to your client config (above), or as a custom connector in Claude.
Complete the OAuth sign-in. In Claude Code, run /mcp and pick the server.
Test it with a prompt like: “List the tools the Reply.io MCP server exposes.”

Reply.io MCP authentication

API key (Bearer); OAuth for clients without header support

What it can change

Read + write Some Reply.io MCP tools change data, not just read it.

Things it can do in your Reply.io account:

sends email replies
starts and pauses sequences
enrolls contacts in sequences
creates and updates contacts
blacklists contacts or domains
reassigns contact owners
approves and sends AI SDR drafts
creates and completes tasks

Source: docs.reply.io, checked 2026-10-16

Review each change before you approve it, especially anything that sends messages or edits records other people rely on.

Cost and credits

Not confirmed Reply.io's docs don't say whether MCP calls use credits or paid usage.

Plan required

Not confirmed Reply.io's docs don't name a minimum plan for the MCP server.

Admin and governance

Controls Reply.io itself provides. Settings inside Claude or ChatGPT aren't counted here.

An admin must approve or enable the connectionNot confirmed
Scopes or permissions can limit what it reachesYesSource: docs.reply.io, checked 2026-10-16
Individual tools can be turned offNot confirmed
MCP activity shows in an audit logNot confirmed

What the Reply.io MCP server can do

Sequences (search, start/pause, enroll contacts)
Contacts (search, create, update, blacklist)
Unified inbox (list threads, send replies)
Jason AI SDR (approvals, knowledge bases, offers, playbooks, reply mode)
Tasks
Help Center search

Reply.io MCP status

Up · auth HTTP 401 · 45 ms · checked 2026-10-16 10:06 PT. Full status and history.

Recipes that use Reply.io

Message test results to sequence copy: rewrite outbound steps from what buyers said (Wynter + Reply.io)

Reply.io MCP FAQ

What is the Reply.io MCP server URL?

https://mcp.reply.io/

How does Reply.io MCP authenticate?

API key (Bearer); OAuth for clients without header support.

Which apps does Reply.io MCP work with?

Reply.io's docs confirm it works in Claude, ChatGPT, Claude Code and Cursor. Other apps aren't confirmed in the docs yet.

Can I use Reply.io in Claude or ChatGPT without code?

Yes. Reply.io's docs confirm it works in Claude and ChatGPT. Add it as a connector in the app settings and sign in. No terminal or config file needed.

Can the Reply.io MCP server change my data?

Yes. Some tools change data, for example: sends email replies, starts and pauses sequences, enrolls contacts in sequences. Review each change before you approve it.

Is the Reply.io MCP server official?

Yes. It's documented on docs.reply.io, last checked 2026-10-16.

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