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Holded API and MCP server

Holded's API is only on paid plans, and it takes an API key and code you write and host to create invoices, record bills or chase payments. Sign in to Holded 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 Holded.

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

Holded's own API, a GitHub MCP server and Cotlet compared
What you need Holded's APIGitHub MCP serverCotlet
Invoices, bills, payments, contacts No Partly Yes, 12 tools
Acts as you, signed in 24/7 No No Yes, Cloud Browser
Fixed for you when Holded changes N/A No Yes, tested every 6h
Runs with your laptop off N/A No Yes, hosted

Checked Oct 14, 2026. Sources: Holded Help: Generate and manage your API key · Holded on Zapier: triggers and actions · Holded Help: Create an invoice · Holded Help: Send your invoices by email

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

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

  2. 02Connect it for your agents

  3. 03Cotlet keeps it signed in and working

How do I connect Holded 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. Holded 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/holded with its own method and path, such as POST /api/v1/holded/contacts/{contact_id}/invoices, with the same API key. Our open-source repo has ready scripts to start from.

REST API docs

What can the Holded API and MCP server do?

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

API reference
Holded tools in Cotlet's MCP server and REST API
Tool What it does Access
list_contacts Contacts with name, type, email and tax ID, newest first. Search by name, email or tax ID. read
get_contact One contact with email, tax ID, type and tags. read
list_invoices Sales invoices with number, client, total, due date and payment status, oldest due date first. read
get_invoice One invoice with lines, taxes, total, payments and approval state. read
list_purchases Purchase invoices (expenses) with supplier, supplier document number, total and due date, newest first. read
list_products Products and services you can put on a line, with name, price and tax. read
create_contact Add a customer, supplier or lead to Holded. write
update_contact Change a contact's name, type, email or tax ID. write
create_invoice Create a sales invoice as a draft, or approve it right away. writeasks first
send_invoice Email an invoice to a recipient from Holded, with a link to the customer portal. writeasks first
add_invoice_payment Record a payment received on an invoice, in full or in part. writeasks first
create_purchase Record a supplier bill as a purchase, as a draft or approved. writeasks first

Scroll the table for all 12 tools.

Ask in plain words. Your agent does the rest.

All Holded use cases

Is it safe to connect Holded?

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 Holded 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 Holded 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 Holded have an API?

Yes, Holded has a REST API, and it is only on paid plans (checked 14 Oct 2026). You create a key in Settings > Developers > Credentials > Add API Token, choose read, write or full access per module, and the plan sets a monthly call limit. Holded has no official MCP server, and the Free plan has no API.

How do I get access?

Sign up free, open Holded 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 Holded yourself and press Enable for agents. Your agent's calls go through it, from its IP with its cookies, so Holded 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: create_invoice, send_invoice, add_invoice_payment, create_purchase wait for your OK by default. You can switch that off per tool for scheduled runs.

Should I use a Holded 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 Holded 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 Holded?

No. Cotlet is independent and not affiliated with Holded.

Give your agent access to Holded.

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

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