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ebill-mcp

Read your Swiss eBill archive and download the invoice PDFs. Read-only — it cannot approve, release or pay anything.

     

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Unofficial, and attached to your bank. eBill is reached only through an authenticated e-banking session, so this server reads through a window you logged into. It is read-only by construction — see What it cannot do — but it is still pointed at a payment system, and it is inherently fragile: the portal is an Angular app that changes without notice. Use it for your own account and respect the provider's terms of service.

An MCP server for the Swiss eBill portal operated by SIX. From any MCP client (Claude Code, Claude Desktop, …) you can list the bills in your archive — biller, amount, due date, delivery date — and download the invoice PDFs.

There is no credential to hold

That is the fact everything else follows from. eBill has no API you can get a key for; the portal is entered by SSO redirect from your bank's e-banking, and the login is second-factor-bound. So a run cannot start without a human.

You log in. The server reads. It opens a visible browser window at your e-banking and hands it to you; it never types into that window. Afterwards it attaches to the same window over the debugging port and reads through the session you established. One login serves many calls — disconnecting a debug client leaves the window standing, which is the whole reason this is usable.

flowchart TD
    C["MCP client"] -->|"stdio JSON-RPC"| S["ebill-mcp"]

    S -->|"ebill_open"| W["a visible browser window<br/>opens at YOUR e-banking"]
    W --> YOU["you log in — second factor,<br/>then open eBill"]
    YOU --> TAB[("the eBill tab<br/>stays open")]

    S -->|"every other tool"| ATT["attach over the debugging port"]
    ATT --> TAB
    TAB -->|"fetch with the browser's<br/>own session cookie"| P[("SIX eBill portal")]

    ATT --> G{"is the path on<br/>the allow-list?"}
    G -->|"no"| NO["refused before it is sent"]
    G -->|"yes — five read paths"| P

    P -.->|"bills, billers, PDFs"| OUT["answers, and files on disk"]

    classDef gate fill:#fff4e5,stroke:#d9822b
    classDef bad fill:#fdecea,stroke:#c0392b
    classDef you fill:#eafaf1,stroke:#27ae60
    class G gate
    class NO bad
    class YOU,W you

No token ever reaches this process. The session lives in the browser and the browser applies it, so there is nothing here to leak — and nothing to store.

What it cannot do

Approving a bill, releasing one for payment, editing an amount, adding a biller subscription and cancelling a standing approval are all one call away in the same API, and one click away in the same page. "We only wrote reads" is a property of today's code, so it is enforced twice:

1. Every request goes through one function that takes no method and no body. There is no code path in this server that can send anything but a GET.
2. Every path is matched against an allow-list first. Five patterns, all reads. Nothing that changes state is on it, so reaching one takes editing the source rather than passing an argument.

Both are tested, and the fixture answers 405 to anything but a GET — so the assertion "only reads arrived" cannot pass for the wrong reason.

Prerequisites

• Node.js ≥ 20.19
• A Chromium for Playwright, and ideally a real Chrome to log in with
• Swiss e-banking with eBill enabled

git clone https://github.com/sapn95/ebill-mcp.git
cd ebill-mcp
npm install
npx playwright install chromium

Register in Claude Code

claude mcp add ebill --scope user -- node /absolute/path/to/ebill-mcp/index.js

Set your bank's entry page once, so ebill_open does not have to be told every time — this server does not guess which bank you use:

export EBILL_BANK_URL=https://your-bank.example.com/login

The normal flow

1. ebill_open — a window opens at your e-banking. You log in and open eBill.
2. ebill_status — confirms the session is reachable and says how long it has left.
3. ebill_list_bills, ebill_download_all, … for as long as the session lasts.
4. When it expires, every tool says so and names the fix: log in again.

Tools

Tool	Arguments
ebill_status	—
ebill_open	url (optional; defaults to EBILL_BANK_URL)
ebill_settings	—
ebill_list_bills	status (open | done | all), limit
ebill_get_bill	bill_id
ebill_billers	—
ebill_download_bill	bill_id, output_path (absolute)
ebill_download_all	output_dir (absolute), status

Environment variables

Variable	Default	Purpose
EBILL_BASE_URL	https://ebill-portal.six-group.com	portal origin
EBILL_CDP	http://localhost:9222	where the logged-in window listens
EBILL_PROFILE	~/.ebill-mcp/profile	browser profile — holds a live banking session
EBILL_BANK_URL	unset	your e-banking entry page for ebill_open
EBILL_BROWSER	chrome	channel or absolute path
EBILL_DEBUG	unset	1 traces every path read, on stderr

A variable that is set, even to the empty string, is authoritative: an empty EBILL_BANK_URL means there is no bank here, not "fall back to the default". Anything else would make "no bank" impossible to express, and would let a test that thought it was isolated open a real login page.

Security: the profile directory holds a live e-banking session. It is a secret, it is git-ignored, and it belongs outside any repository. Delete it when a run is done.

Three things the portal does that cost a day to find out

A 200 is not evidence. The Angular server answers any unknown path under its own prefix with the app shell and a 200 application/json. The four obvious guesses at a PDF endpoint — payments/{id}/receipt, /document, /bill, /pdf — all "work" if you read status codes. None of them exists. Every download here is checked by its first bytes instead.

The PDF is not under /api/. It is /ebill-portal/ui/payment-pdfs/<businessCaseId>/<receiptFileName>, and the filename out of the record is part of the path — URL-encoded, not derivable, not optional. Records without a filename have no document, and are reported as such rather than given a synthesised name.

One status is half an archive. The bills live under two, done and open, and the default view shows one of them. ebill_list_bills reads both unless you narrow it on purpose.

Also worth knowing: businessCaseDate is the date eBill delivered the bill, which is days to weeks away from the date printed on the document. If you are filing these, the printed date is usually the one you want.

Checks

npm run gate      # lint + smoke + hygiene + tests with coverage enforced
npm test          # just the tests
npm run mutate    # mutation-test the lines this branch changed

Runs offline and without a bank: the suites attach to a throwaway Chromium holding a local fixture, so nothing they do can reach a real account.

The fixture is the interesting part. It answers the app shell with a 200 for unknown paths exactly as the portal does — a fixture that returned 404 there would make the guard against it untestable — and it refuses anything that is not a GET, so the test asserting that only reads left this process means something.

Mutation testing

npm run mutate asks a different question: not "do the tests pass" but "would they notice if a guard were removed". StrykerJS deletes one piece of behaviour at a time and reruns the suite; whatever survives is something no assertion is watching. It found eleven real gaps in the sibling pingen-mcp after model review rounds had stopped turning anything up. Here it runs over the lines a branch changed, because this suite launches a real browser and a full pass costs hours.

License

MIT © sapn95 — see LICENSE.