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Yuki + Peliqan MCP

Query and update Yuki (Nmbrs Accounting) with AI

Connect Yuki, now Nmbrs Accounting, to Claude, ChatGPT or any MCP client. Ask about open invoices, ledgers, VAT codes and documents, and create contacts, projects and sales invoices from the chat.

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Claude Yuki via Peliqan
Which customers owe us the most right now?

€61,480 is open across 34 customers. The three largest:

CustomerOpenOldest invoice
Bakker Bouw€8,94047 days overdue
Janssen BV€6,21018 days overdue
De Wit BV€4,875Due in 6 days
Add Groen Tuinen as a new contact, phone 030-1234567.

I'll create contact Groen Tuinen with phone 030-1234567 in Yuki. Shall I go ahead?

Yes, go ahead.

Done. Yuki has accepted the new contact.

Example figures. On your account it runs on your own Yuki data.

Getting answers out of Yuki takes too many clicks

Yuki automates your bookkeeping. A quick question about it still means reports, filters and exports.

Every question means a report

"Which customers owe us the most?" turns into a report, an export and a spreadsheet.

Yuki is half the picture

Your CRM, webshop and bank sit outside Yuki. Real questions need them side by side.

The API is SOAP, with a daily limit

Yuki's web services use SOAP and cap the calls per day, so heavy questions use up calls fast.

Building your own takes code

A do-it-yourself MCP server means SOAP code, API key handling and hosting.

One MCP server for Yuki and 300+ other apps

Peliqan syncs Yuki (Nmbrs) into its built-in data warehouse and gives your AI one MCP server.

Questions

Ask in plain language

Ask about open invoices, ledgers, transactions, VAT codes and documents. Your AI writes the query and gives you the answer.

Synced copy

Most questions use no API calls

Most questions run as SQL on the synced copy, so they don't count toward Yuki's daily call limit. A few live lookups call Yuki.

300+ apps

Yuki plus the rest

Join Yuki with HubSpot, your webshop, your bank file or any other connected app in one question.

Writeback

Create from the chat

Your AI can create and update contacts and projects, and create sales invoices. Writeback is on by default, and one switch per connection makes it read-only.

What your AI can read and write

Peliqan syncs these Yuki tables into its data warehouse. Some also accept writes from your AI.

Yuki dataYour AI can askYour AI can write
Open customer invoicesWho owes the most, how overdue each invoice isCreate sales invoices
ContactsContact details and VAT numbersCreate and update contacts
ProjectsYour projectsCreate and update projects
Open supplier invoicesWhat you owe suppliers, bills due in the next 14 daysRead only
GL accounts and balancesBalance per GL account, accounts with a negative balanceRead only
TransactionsPostings per GL account, the most recent transactionsRead only
VAT codesYour VAT codes and their ratesRead only
DocumentsDocuments uploaded this weekRead only
RGS scheme and transaction matchesThe RGS codes behind your accounts, matched transactionsRead only
Backoffice questions and workflowOpen questions from your accountant, documents waiting for reviewRead only
Other changes, such as marking an invoice as paid, are not supported.

What teams ask Yuki MCP

Four example requests. Each one is a single prompt.

Collections

Invoices by age

"Group all open customer invoices by how overdue they are: current, 1-30, 31-60, 61-90 and 90+ days."
For bookkeepers
Payables

Bills coming due

"How much do we still owe suppliers, and which bills are due in the next 14 days?"
For controllers
Ledger

Balances to check

"Which GL accounts have a negative balance?"
For accountants
Invoicing

A sales invoice from the chat

"Create a sales invoice for Janssen BV for 12 consulting hours at 95 euro plus 21% VAT."
For office managers
Your AIClaude, ChatGPT, Gemini
↓ questionschanges ↓
Peliqan MCP serverOne URL for every connected app
↓ SQL on the synced copywriteback to the API ↓
Peliqan data warehouseInvoices, ledgers, contacts and documents as tables
↑ sync on a schedule
Yuki (Nmbrs)Plus HubSpot, Exact Online and 300+ more
How it works

A synced copy for questions, the API for changes

  • Most questions don't use your API calls

    Most of your AI's questions run as SQL on the copy in Peliqan's data warehouse, so they don't count toward Yuki's daily call limit. A few live lookups call Yuki's web services.

  • Changes go back through writeback

    When your AI creates a contact, project or sales invoice, Peliqan sends it to Yuki's web services. Your AI app never sees your API key.

  • Answers as fresh as the last sync

    You set the sync schedule per connection, such as hourly or daily. Records your AI creates show in the copy after the next sync.

Set up in three steps

Nothing to install, and no code to write.

Step 1

Connect Yuki

In Yuki, create an API key under Settings > Web Service and enter it in Peliqan. Leave the administration ID empty to sync every administration the key can see. See the Yuki setup guide.

Step 2

Add Peliqan to your AI

Add https://mcp.peliqan.io/mcp as a custom connector in Claude, ChatGPT or Gemini, then sign in to Peliqan.

Step 3

Ask your first question

For example: "Which customers owe us the most right now?"

Prefer a video? Watch how to connect Yuki to Claude.

Peliqan vs an open-source Yuki MCP

In October 2026 we found no MCP server from Yuki itself. CodeMill offers a free one you run yourself.

Peliqan MCPCodeMill open source
Who runs itPeliqan, nothing to installYou, on Node.js 20 or later
How it reads YukiSynced copy in a data warehouseCalls Yuki's web services live
WritesCreate and update contacts and projects, create sales invoicesCreate or update contacts, create and book sales invoices, book purchase invoices and journal entries, upload documents
Other apps in one question300+ in the same serverYuki only
Where the API key livesWith Peliqan, never in your AI appIn an environment variable or keys file on your machine
Price€15 per connection per month, 7-day free trialFree (MIT licence), runs on your own machine

The full Peliqan Yuki integration

MCP is one part. The same connection also feeds reporting, transformations and syncs.

Yuki connectorYuki synced into the built-in data warehouse BI and reportingYuki data in Power BI, Excel or Metabase TransformationsClean and combine data with SQL or low-code Python Syncs to other appsPush Yuki data to the tools your team uses Data quality alertsSQL checks with alerts by Slack or email AI featuresMore ways to use AI on your Yuki data

Want to see it on your own Yuki?

Tell us what you want to ask Yuki (Nmbrs Accounting), and we will show you how it works on your data. Or start a free trial.
Contact us Start for free 7-day free trial, no card needed

Yuki MCP, answered

What is a Yuki (Nmbrs Accounting) MCP server?
It is a Model Context Protocol server that lets AI apps such as Claude, ChatGPT and Gemini read your Yuki data and, if you allow it, create contacts, projects and sales invoices. Peliqan runs one for you, so there is nothing to install or host.
Does Yuki or Nmbrs Accounting have its own MCP server?
We found none from Yuki, now called Nmbrs Accounting, or from Visma as of October 2026. Third-party options include CodeMill's open-source server, which you install yourself, and Yuki MCP Works. Peliqan's Yuki MCP is hosted for you and also covers 300+ other apps in the same server.
How do I connect Yuki to Claude or ChatGPT?
In Yuki, a portal administrator creates an API key under Settings > Web Service. Start a free trial on Peliqan and enter the API key. Leave the administration ID empty to sync every administration the key can see, or enter one ID, or several separated by commas, to sync only those. Then add https://mcp.peliqan.io/mcp as a custom connector in your AI app and sign in to Peliqan. In ChatGPT, custom connectors need a Business, Enterprise or Edu plan.
Which Yuki (Nmbrs) data can the AI see?
Open customer and supplier invoices, GL accounts and balances, transactions, contacts, projects, VAT codes, documents, the RGS scheme, transaction matches and open backoffice questions from your accountant, synced into Peliqan's data warehouse.
Can the AI create or change records in Yuki?
Yes. Your AI can create and update contacts and projects, and create sales invoices. Other changes, such as marking an invoice as paid, are not supported. Most AI apps, such as Claude and ChatGPT, ask you to approve a change before it runs. Writeback is on by default, and one switch per connection makes it read-only.
Will AI questions use up my API calls?
Mostly not. Questions run as SQL on the synced copy in Peliqan's data warehouse, not on Yuki's web services. Only the scheduled syncs, a few live lookups and the changes your AI makes call Yuki.
Is my Yuki data secure?
Peliqan is SOC 2 Type II and ISO 27001 certified, GDPR compliant and hosted on AWS in Frankfurt. Peliqan holds your API key, so your AI app never sees it.
What does it cost?
Peliqan MCP costs €15 per connection per month, with a 7-day free trial and no card needed. There is no charge per user, but each connection belongs to one user.