Already connected?

What to ask it.

FIGURX drafts invoices, quotes, proformas, receipts and credit notes, works out VAT in both directions, and handles CIS, mileage, late payment interest and the NHS locum pension split. Tap any prompt to copy it.

Things to ask it.

Anyone

Invoice Brookfield Practice for two Saturday sessions at £150 and one consultancy day at £500 plus VAT

I was paid £1,200 including VAT at 20%. What was the net and the VAT?

An invoice for £5,000 is 30 days late and base rate is 4%. What can I claim on top?

Doctors and locums

I did a £500 locum session. What do I invoice the practice if I am pensioning it?

The practice quoted £564.71 including pension. What is the actual fee?

I last worked there on 1 August. How long have I got to pension it?

Trades and construction

£1,000 labour and £500 materials, I am CIS registered. What will land in my bank?

Same job but with the domestic reverse charge. What goes on the invoice?

I have done 11,000 business miles this year. What can I claim?

Procurement and resale

A unit lands at £80 and I need 35% gross margin. What should I charge?

Draft a proforma for 40 of those so they can raise a purchase order

They returned 6 against invoice INV-2026-0041. Credit note please.

Not set up yet?

Five steps, about two minutes. You need a paid ChatGPT plan for custom plugins.

1
Open Settings, then Connectors
Top right, click Add, then Create MCP App.
2
Name it FIGURX
The description is optional. Skip the icon.
3
Paste the server URL
Under Connection choose Server URL, then paste the address below.
4
Set authentication to none
Change it from OAuth to No authentication. There is nothing to log in to.
5
Create, then Connect
Tick the box to continue, click Create, then Connect on the panel that appears.

The server address

https://mcp.figurx.app/mcp

What it will not do.

FIGURX drafts. It does not send, approve, number, save or mark anything paid, and it will not invent a rate, a tax figure or a payment status. Where a commercial fact is missing it asks for it. It records business information and is not a place for patient names, NHS numbers or clinical notes.

What you can do in FIGURX

Do I have to type every invoice?: No. Save a customer once with their address and payment terms, save what you sell or the sessions you work, then pick them. For locum work you log sessions as you do them and bill whatever has built up at a practice in one go.
I quoted a customer and they sent a purchase order. Do I retype it?: No. Open the quote and turn it into an invoice, and into a delivery note, with the same lines and figures and its own number. Put their purchase order number on and it follows onto everything, which is what stops accounts payable sending the invoice back.
Can my documents look different from everyone else’s?: Yes. There are five letterheads with genuinely different layouts, not one design in five colours, and you choose per document. Your name, address, payment and VAT details go on the one you pick. A letterhead is frozen onto a document when you approve it, so editing it later never changes something you have already sent.
Can my colleagues use the same records?: On Business, yes. Invite them by email and they join the moment they sign in, no password to set. Everyone sees the same customers and documents. Nobody can see another workspace, and there is no account that can.
What stops a price being wrong?: Every figure is calculated in the database, not by a language model and not by your browser. A total sent from a browser is ignored and recalculated from the lines. Document numbers come from a counter, so two people cannot be handed the same one. Approving a document locks its lines.
What happens if I put a patient’s details in?: An NHS number or a date of birth is refused outright. Wording that looks like it identifies a patient is flagged for you to check before you approve. FIGURX is a business record and must never become a clinical one.
Can I move off my current invoicing tool?: Export your customers and items from it and send them to hello@figurx.app and we will load them in. Most of what people pay for elsewhere is saved customers, saved items and a choice of letterhead, and all three are here.

Questions.

I cannot see the Add button

Connectors need a paid ChatGPT plan. On Plus you add one under Settings, then Connectors. On a Business or Enterprise workspace an admin may need to allow custom connectors first.

What is MCP?

It is the standard way ChatGPT talks to outside tools, the same mechanism behind the Gmail and Canva plugins. You are pointing ChatGPT at our server, which does the arithmetic and hands back a document. Nothing is installed on your machine.

Is it safe to connect something with no authentication?

There is no account to break into, because FIGURX stores nothing. The tools take the figures you give them, calculate, and return a result. ChatGPT warns you about custom servers generally, which is right, and you should read that warning for anything you connect.

What happens to what I type?

The figures are sent to our server, calculated, and returned. We do not write them to a database and we keep no copy. Our hosting keeps ordinary server logs for a short period to keep the service running. ChatGPT itself is run by OpenAI and what they record is covered by their own policy.

Can it send my invoice?

No, and that is deliberate. It drafts only. It does not send, approve, number, save or mark anything paid. If ChatGPT ever tells you an invoice was sent or a payment recorded, that is wrong and we would like to know.

Can I get a PDF?

Not yet. You get the figures and the document content, which you can paste into whatever you already use. Export comes with accounts.

Why does it ask me for the Bank of England base rate?

Because it changes, and a rate baked into software goes stale without anyone noticing. Statutory late payment interest is the base rate plus eight percent, so FIGURX asks rather than assumes.

Does it cost anything?

The tools in ChatGPT are free to use. A FIGURX account is free as well, for unlimited documents and up to two customers. Paid plans start at £5.99 a month.

It got something wrong

That is the single most useful thing you can tell us. Send the figures you entered and the figures you got back to hello@figurx.app.

Anything else, email hello@figurx.app or see support.