Integration · Accounting

Connect Claude & ChatGPT to e-Boekhouden.nl

Ask your AI which invoices are still unpaid, what the balance on a ledger account was last quarter, or to create a sales invoice in e-Boekhouden.nl. It can search relations, read invoices, products and bookkeeping entries (mutations), check ledger balances for a period, and create relations, products, invoices and mutations.

Connect e-Boekhouden.nl free

Free plan, no credit card. Takes about a minute.

Try asking

“Which customers still owe us money?”
The AI lists outstanding invoices on the debtor side, with the amounts still open.
“Which bills do we still have to pay?”
It lists outstanding invoices on the creditor side.
“What is the balance on ledger 8000 for this quarter?”
It finds the ledger account and reads its balance for the period you name.

What your AI can do

Invoices and relations

List and read sales invoices and outstanding items, search customers and suppliers, and create invoices from your templates.

Ledgers and balances

Read ledger accounts, cost centers and balances for any period, for one account or all of them.

Bookings and products

Read and create mutations, and look up, create and update products with prices, VAT and ledger.

“Create an invoice for Bakkerij de Vries: 8 hours of consulting at 95 euros.”
It looks up the relation and an invoice template and creates the invoice with the line, VAT code and payment term. It is only emailed if you ask for that.
“Add a new customer, Jansen Installatie BV.”
It searches first to avoid a duplicate, then creates the relation with name, address, email and IBAN.
“Show the bookings for invoice number 2026-014.”
It lists the mutations linked to that invoice number with their rows.

38 tools for e-Boekhouden.nl

These tools are switched on when you connect. You can switch any of them off, or require your approval before it runs.

create_costcenterChanges dataCreate a new costcenter.
create_invoiceChanges dataCreate a sales invoice for `relation_id` with `items` (description, quantity, price, VAT code, ledger), a `template_id` and `term_of_payment`. If you pass `email`, the invoice is emailed to the relation right away.
create_ledgerChanges dataCreate a new ledger. Required: code or description.
create_mutationChanges dataBook an entry (mutation) with `type`, `date`, `ledger_id` and rows (amount, ledger, VAT), optionally linked to a relation and invoice number. This writes to the books.
create_productChanges dataCreate a product with `code`, `description`, `vat` code, `ledger_id` and prices.
create_relationChanges dataCreate a relation (customer or supplier) with name, type, address, email, phone and IBAN in `body`. Search first to avoid duplicates.
create_userChanges dataCreate a new user. Required: name. Search users first to avoid duplicates.
delete_costcenterDeletesPermanently delete a costcenter by costcenter id. Destructive action; may require approval.
delete_productDeletesPermanently delete a product by product id. Destructive action; may require approval.
get_costcenterGet one costcenter by costcenter id.
get_invoiceGet one invoice by `invoice_id`, with its lines and totals.
get_ledgerGet one ledger account by `ledger_id`.
get_ledger_balanceGet the balance of one ledger account (`ledger_id`) for a period (`from`/`to`).
get_mutationGet one bookkeeping entry (mutation) by `mutation_id`, with its rows.
get_productGet one product by `product_id`, with prices, VAT and ledger.
get_relationGet one relation by `relation_id`, with address, contact details and bank data.
get_swaggerGet one swagger by catch all.
get_userGet one user by user id.
list_administrationsList the administrations (bookkeeping companies) you have access to.
list_cost_centersList cost centers, optionally filtered by description or parent.
list_email_templatesList email templates you can use when emailing an invoice.
list_invoice_templatesList invoice templates (layouts), filtered by name, type or active flag. Use this to get the template_id needed to create an invoice.
list_invoicesList sales invoices, filtered by `relation_id`, `invoice_number` or `date`, with paging.
list_ledger_balancesGet balances of all ledger accounts for a period (`from`/`to`), optionally per cost center.
list_ledgersList ledger accounts (grootboekrekeningen), filtered by `code` or `category`.
list_linkedsList linkeds. Results are paginated.
list_mutationsList bookkeeping entries (mutations), filtered by type, date, description or invoice number.
list_outstanding_invoicesList unpaid invoices: `cred_deb` D for debtors (money owed to you) or C for creditors (bills you owe).
list_productsList products, filtered by `code` or product group, with paging.
list_products_get_product_groupList products.
list_unitsList the units (e.g. hours, pieces) that invoice and product lines can use.
search_relationsSearch relations (customers and suppliers) by name, code, city, email, contact or type (B business / P private), with paging.
search_usersSearch users by member number, name, email or city. Use this to find existing users before creating a new user. Results are paginated.
update_costcenterChanges dataUpdate an existing costcenter identified by costcenter id. Only the fields you pass are changed.
update_ledgerChanges dataUpdate an existing ledger identified by ledger id. Only the fields you pass are changed.
update_productChanges dataUpdate a product by `product_id`, e.g. description, prices or active flag. Only the fields you pass change.
update_relationChanges dataUpdate a relation by `relation_id`; pass the fields to change in `body`.
update_userChanges dataUpdate an existing user identified by user id. Only the fields you pass are changed.

Set up in three steps

1
Pick the app
Create a free HeyMyApps account and choose e-Boekhouden.nl from the app list.
2
Paste your key
Paste your e-Boekhouden.nl API token. In e-Boekhouden.nl open your account settings and create an API token. It is shown only once, so copy it right away. HeyMyApps swaps it for short-lived session tokens automatically.
3
Add the link to your AI
You get a personal MCP link. Add it to Claude, ChatGPT or Cursor:
1. Click your name, then Settings › Connectors › Add custom connector.
2. Paste your link as the Remote MCP server URL.
3. Switch it on from the + menu in a chat.

Questions

What can the AI do in e-Boekhouden.nl?

The AI can list administrations, ledgers, cost centers, units, templates, relations, products, invoices and mutations, and read ledger balances and outstanding invoices. It can create and update relations and products, create sales invoices, and book mutations if you switch those tools on.

Does the AI see my e-Boekhouden.nl credentials?

No. Your e-Boekhouden.nl credentials are encrypted at rest and never shown to the AI. After you save them, they are not shown again, not even to you. The AI only sees the results of the tools it calls.

Can I control what the AI is allowed to do?

Yes. You choose which tools are switched on, so you can start read-only. Booking a mutation writes to your books, and an invoice can be emailed to the relation right away, so both can require your approval before they run. Every tool call is logged.

Does it work with ChatGPT?

Yes. In ChatGPT go to Settings › Apps & Connectors › Advanced and turn on Developer mode, then add your HeyMyApps link. Developer mode needs a paid ChatGPT plan: Plus, Pro, Business or Enterprise. The same link also works in Claude (Settings › Connectors › Add custom connector), Cursor and other MCP clients.

What does it cost?

HeyMyApps has a free plan with no credit card required. Paid plans bill per completed task. You also need your own e-Boekhouden.nl account.

Why do I only paste one token?

e-Boekhouden.nl works with an API token that is exchanged for short-lived session tokens. You paste the API token once, and HeyMyApps gets new session tokens for you automatically.