Ask Claude or ChatGPT about your books
Add https://books.399apps.com/mcp as a custom connector in Claude (web, mobile, Desktop
or Claude Code) or ChatGPT, sign in to 399apps, and ask in plain language: who owes
you, whether an invoice is paid, your GST position this month, stock in each godown. It reads your
real Nidhi Books ledger, never changes anything, and is included in ₹399/month.
Reports you can ask for
You ask the question; the assistant picks the right tool. These are the answers it can pull from Nidhi Books today.
| You ask | What comes back |
|---|---|
| "Who owes me, and how late?" | Receivables ageing: current / 1–30 / 31–60 / 61–90 / 90+ days overdue, per customer |
| "What is my GST position this month?" | GST summary in the shape of GSTR-3B: outward tax, reverse charge, input tax credit and net payable |
| "How much does Sharma Traders owe?" | One customer's outstanding, looked up by name, with their open invoices |
| "Is invoice INV-0142 paid?" | One invoice by number, with every payment made against it |
| "What did we sell and collect last month?" | Sales and receipts summaries for a period |
| "How much of this item is left in each godown?" | Stock on hand by warehouse |
| "Which supplier bills are still unpaid?" | Supplier bills with tax, TDS and what is still payable |
| "Give me the usual Monday report." | A saved report recipe: the same calls, periods and columns every time |
How to connect
- Add the connector. In Claude (claude.ai on the web or the mobile app, Claude Desktop or Claude Code) or ChatGPT, add a custom connector (MCP server) with the URL https://books.399apps.com/mcp.
- Sign in to 399apps. Your assistant opens the 399apps sign-in page. Sign in with your usual 399apps login. No API key to create or paste.
- Pick the organisation and grant access. Choose the organisation the assistant may read and approve the read scopes it asks for. Your role in that organisation still applies underneath.
- Ask your first question. Ask "who am I connected as?" to confirm the organisation and role, then ask about your books in plain language, for example "who owes me more than 60 days?".
In Claude Code, from a terminal, then run /mcp to sign in:
claude mcp add --transport http nidhi-books https://books.399apps.com/mcp
Any other MCP host that supports OAuth 2.1 connects the same way: the URL, then sign-in.
Self-hosting? The same server runs at /mcp on your own Nidhi Books domain.
Full scope and tool reference: 399apps Books for AI assistants.
Other apps the connector reads
If your organisation also runs these apps, the same connection can read them, once you grant that app's scope and your role opens it in 399apps.
| App | What an assistant can read |
|---|---|
| Nidhi Books | Customers, items, invoices, supplier bills, payments, receivables ageing, GST summary, sales and receipts summaries, stock on hand, saved report recipes |
| Nidhi Assets | The asset register: stages, who holds what, and each asset's history |
| Nidhi Delivery | Delivery jobs, their status and timeline, and each rider's day: counts and cash handed over. Never the drop address or the contact's phone |
| Nidhi Appointments | Bookings and booking numbers: counts by status and source, no-show rate, busiest staff and services. Never customer phone numbers |
| Nidhi Signage | Which screens are online, offline or unpaired, their playlists and groups, and what they played |
| Nidhi Staff | People, leave balances and attendance counts. Never pay: no salary, bank, payslips, tax or statutory IDs |
| Nidhi Campaigns | Status, reach, send and receipt counts per channel, and sales that followed. Counts only, never a recipient's name |
What it will not do
It cannot raise an invoice, record a payment, send a message or change anything. Every tool is read-only. It does not hand over salaries, customer phone numbers or a delivery drop address. And 399Apps is not in the ChatGPT app directory yet: you add it by URL. We would rather say that plainly than have an assistant promise you something it cannot do.
Who it is for
If you run a shop, trading firm or service business on Nidhi Books and already ask Claude or ChatGPT for help, this fits: your follow-up list and GST position come from the ledger, not from a spreadsheet you pasted in. If your books live in TallyPrime or Zoho Books, this does not reach them. Zoho Books has its own Claude connector; for TallyPrime, look at moving to Nidhi Books first. The short version, with how Zoho and Tally compare: can I connect Claude to my accounting software? For a side-by-side of every Indian accounting product that ships an MCP server today: which Indian accounting software has an MCP server? For ten real questions you can ask right now, with what comes back: 10 questions to ask your books through Claude.
Access and safety
- Sign in, no keys. You connect with your 399apps login over OAuth 2.1. There is no API key to copy, leak or rotate.
- Your role still applies. A scope is a ceiling, not a grant. An assistant never sees more than you can in the app.
- One organisation per connection. You pick it at sign-in.
- Revoke any time from Settings › Connected assistants.
Nothing extra to pay: the connector is part of ₹399/month with unlimited users, and 399Apps charges nothing per call. You pay your AI provider for your own assistant as usual.
Common questions
I use Claude every day. Can I connect it to my accounting software and ask who owes me money?
Yes, if your books are in Nidhi Books. Add https://books.399apps.com/mcp as a custom connector in Claude (web, mobile, Desktop or Claude Code), sign in to 399apps and pick your organisation. Then ask "who owes me more than 60 days?" and Claude pulls the receivables ageing report from your real ledger. It is read-only and included in ₹399/month.
Does 399Apps have an MCP server?
Yes. https://books.399apps.com/mcp is a read-only MCP (Model Context Protocol) server. It covers Nidhi Books and also reads Nidhi Assets, Delivery, Appointments, Signage, Staff and Campaigns where your organisation has those apps. It works in Claude, ChatGPT and any MCP host that supports OAuth 2.1. You sign in with your 399apps account; there is no API key. It costs nothing extra.
Can I connect ChatGPT to my 399Apps books?
Yes, as a custom connector: add https://books.399apps.com/mcp and sign in, the same way as in Claude. 399Apps is not yet listed in the ChatGPT app directory, so you add it by URL rather than picking it from a list.
Can the AI assistant create an invoice or record a payment for me?
No. Every tool is read-only. An assistant can look up customers, invoices, bills, payments and reports, but it can never create, change, send or delete anything in 399apps. That stays with you in the app.
My accountant and my sales staff have different access. What does the assistant see?
Only what the person who connected it can already see. A scope is a ceiling, not a grant: your role in the organisation still applies, so a salesperson's assistant sees what that salesperson sees in 399apps, and no more. The connection is tied to the one organisation you picked at sign-in.
Zoho Books also has a Claude connector. Why would I pick Nidhi Books?
Zoho Books has an official MCP server and Claude connector too, so pick on the books, not the connector. Nidhi Books is ₹399/month with unlimited users, the connector costs nothing extra and charges nothing per call, and you can self-host the whole thing. If you already run Zoho Books, its own connector is the shorter path.
How do I stop an assistant reading my books?
Revoke it any time from Settings › Connected assistants in 399apps.
Books your AI assistant can actually read.
GST accounting with a read-only Claude and ChatGPT connector, included at no extra cost.