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Kustomer API and MCP server

Kustomer's API covers conversations, replies, notes and merges, but it takes an admin API key and code you write and host. Sign in to Kustomer once in your own Cloud Browser, and your AI agent does the work there for you. The same tools work over MCP for agents and as a REST API for scripts.

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Not affiliated with Kustomer.

Kustomer has no API for this. So we run one for you.

Kustomer's own API, a GitHub MCP server and Cotlet compared
What you need Kustomer's APIGitHub MCP serverCotlet
Use without an API key or code No Partly Yes, 12 tools
Acts as you, signed in 24/7 No No Yes, Cloud Browser
Fixed for you when Kustomer changes N/A No Yes, tested every 6h
Runs with your laptop off N/A No Yes, hosted

Checked Oct 17, 2026. Sources: Kustomer Help: What is the Kustomer MCP Server? · Kustomer Help: Understanding the Kustomer MCP Server tools · Kustomer developers: Authentication and API keys · Kustomer developers: Rate limiting

Your own Cloud Browser, on 24/7. Sign in once. We keep it connected.

  1. 01Sign in to Kustomer in your own Cloud Browser

  2. 02Connect it for your agents

  3. 03Cotlet keeps it signed in and working

How do I connect Kustomer to Claude, ChatGPT or my code?

AI agents connect over MCP, scripts call the REST API. Both reach the same 12 tools with one API key.

For AI agents: MCP

Add Cotlet to your agent once. Kustomer and every other app you connect show up as its tools.

  • Claude
  • ChatGPT
  • OpenClaw
  • Hermes
  • GrokBot
  • Cursor
  • n8n
  • Any MCP client
  1. 1

    Add Cotlet to your agent

    Claude Code
    claude mcp add --transport http cotlet \
  https://cotlet.dev/mcp/v1 \
  --header "Authorization: Bearer $COTLET_API_KEY"
    Cursor
    {
  "mcpServers": {
    "cotlet": {
      "url": "https://cotlet.dev/mcp/v1",
      "headers": {
        "Authorization": "Bearer ${COTLET_API_KEY}"
      }
    }
  }
}
    Codex
    # ~/.codex/config.toml
[mcp_servers.cotlet]
url = "https://cotlet.dev/mcp/v1"
bearer_token_env_var = "COTLET_API_KEY"

    Paste the snippet for your client. The same server and key serve every app you connect, so you do this once.

For scripts: REST API

Every tool is an endpoint under /api/v1/kustomer with its own method and path, such as POST /api/v1/kustomer/conversations/{conversation_id}/replies, with the same API key. Our open-source repo has ready scripts to start from.

REST API docs

What can the Kustomer API and MCP server do?

12 tools on your own Kustomer account. Agents call them as operations of the MCP tools kustomer_read and kustomer_write; scripts call each one at its own REST endpoint, with the same inputs and answers.

API reference
Kustomer tools in Cotlet's MCP server and REST API
Tool What it does Access
search_conversations Conversations that match a status, tag, customer or update date, with the newest update first. read
get_conversation One conversation with status, priority, assignment, tags and linked conversations. read
get_conversation_messages The message thread of a conversation, oldest first, with channel and direction. read
search_customers Customers by name, email, tag or company, with their open conversation count. read
get_customer One customer profile with contact details, company, tags and recent conversations. read
list_tags Active conversation tags with their names. read
reply_to_conversation Send a reply to the customer on the channel of the last message. writeasks first
add_note Add a note only people in your organization can see. writeasks first
add_tags Add existing tags to one conversation and keep the others. write
snooze_conversation Snooze a conversation until a time or until the customer replies. write
mark_conversation_done Set a conversation to Done. write
merge_conversations Merge one conversation into another of the same customer. writeasks first

Scroll the table for all 12 tools.

Ask in plain words. Your agent does the rest.

All Kustomer use cases

Is it safe to connect Kustomer?

You sign in yourself in your own Cloud Browser, we never save your password, and anything that reaches your readers waits for your OK. The browser profile is encrypted in the EU. Independent scanners grade cotlet.dev A+.

Security overview

How much do the Kustomer API and MCP server cost?

One price for both: a tool call costs the same over MCP or REST. Free 7-day trial with 2,000 credits, no card needed. Then one-time credit packs, no subscription, valid 12 months. Most calls use 25 credits, and your Cloud Browser uses 50 credits a day while Kustomer is enabled for agents, so 20 calls a day come to 550 credits.

See full pricing
Cotlet credit packs: price, credits and calls at 25 credits each
Credits Price, one time Calls at 25 credits Per 1,000 credits
5,000 $29 200 $5.80
15,000 $79 600 $5.27
32,000 $149 1,280 $4.66
60,000 $249 2,400 $4.15

Only successful calls use credits; failed calls and timeouts cost nothing. At a balance of 0 calls pause, never a surprise charge. Authenticate with the Authorization: Bearer header.

Questions

Does Kustomer have an API?

Kustomer has a full REST API with API keys, and an official MCP server that is read-only (checked 17 Oct 2026). The MCP server searches and reads conversations, messages, customers, companies, notes, custom objects and workflows. It cannot reply, add notes, tag, snooze, merge or close. Kustomer says writes are coming, with no date.

How do I get access?

Sign up free, open Kustomer under Integrations in the console and press Request access. Your free trial starts with your account, no card needed.

Is the MCP server different from the API?

No, only the way in. Cotlet builds each integration as a REST API and puts an MCP server on top, so both have the same 12 tools, the same inputs and answers, one API key and one price. AI agents such as Claude, ChatGPT or Cursor use MCP; scripts, cron jobs and HTTP steps in n8n, Make or Zapier use the REST API.

What is the Cloud Browser?

Your own Chrome that Cotlet runs for you in the EU, around the clock. You open it from the console, sign in to Kustomer yourself and press Enable for agents. Your agent's calls go through it, from its IP with its cookies, so Kustomer sees the browser you signed in with. Password saving is off and the profile is stored encrypted with AES-256-GCM.

Can my agent act without asking me?

Not on anything that reaches other people: reply_to_conversation, add_note, merge_conversations wait for your OK by default. You can switch that off per tool for scheduled runs.

Should I use a Kustomer MCP server from GitHub instead?

Pick one if you want the code on your own computer and do not mind the upkeep: you install it, sign it in and fix it when Kustomer changes. Pick Cotlet if you want it hosted and kept working for you.

Can I use it in n8n, Make or Zapier?

Yes. Add https://cotlet.dev/mcp/v1 in n8n's MCP Client node, or call the REST endpoints from an HTTP step in Make or Zapier.

Who runs Cotlet?

Cotlet is run by Take Group, a Polish software company working since 2019. Take Group runs about 3,200 websites on its own systems and has its own DevOps team for infrastructure security. We built and used integrations like this inside the company for years before opening them as Cotlet.

Is Cotlet affiliated with Kustomer?

No. Cotlet is independent and not affiliated with Kustomer.

Give your agent access to Kustomer.

Free 7-day trial with 2,000 credits, no card needed.

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