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MCP server for physical mail: send real letters from your AI assistant

With FrankKi MCP you tell your AI assistant which letter goes to whom. FrankKi puts it on your letterhead, prints it, puts it in an envelope and hands it to the post once you approve it. MCP is the open standard that lets Claude, ChatGPT and other assistants talk to FrankKi. You do not need to write any code.

Start free Connect Claude

live now · OAuth sign-in, no token needed · no subscription · nothing to install

Works withClaudeClaude CodeChatGPTCursorVS Code

What your business does with it

You tell your assistant in plain words what should go out. FrankKi and the post do the rest.

Letterhead and logo

Upload your logo as SVG, PNG or JPG, in the dashboard under Letterhead & templates or through your assistant. Your assistant can also take logo and colours from your website. If your letterhead only exists as a Word or PDF file, save it as a PNG. FrankKi does not print a PDF file as a letterhead. Before the first send you check everything on a sample letter.

One letter to many recipients

Give your assistant the recipient list, for example as a CSV file in the chat. Or import it in the dashboard under Clients first, which is where every recipient list lives, tenants and customers too. Each letter in a batch is its own letter. Your assistant fills the placeholders of your template per recipient, such as name, flat or amount. If each recipient has their own PDF, say their service charge statement, it attaches it to exactly that letter. A batch holds up to 100 letters, and you approve it with one decision. 180 letters make two batches.

Example for Claude

Send every tenant on this list the notice about the water shut-off on 14 November. Fill in each tenant's name and flat, and show me the preview and total price before I approve.

You approve

No letter leaves without approval, unless you switch on autopilot yourself, with fixed limits. You can always approve in the FrankKi dashboard under Approvals. If you allowed it when connecting, you can also approve right in the chat. Invite colleagues with the approver role and they can approve too. Anything nobody approves within 72 hours expires and costs nothing.

Prepaid balance, no subscription

You top up through Stripe, each send takes its price from the balance, and without balance your assistant cannot spend anything.

Tracking

Ask for the status of a letter and you get its state and expected delivery, plus tracking number and proof of posting for registered mail.

Records for your bookkeeping

Every top-up comes with a receipt to download, and you can export your letters as GoBD CSV, DATEV export or PDF bundle. FrankKi is a small business under § 19 of the German VAT Act (UStG) and charges no VAT. The price shown is the final price.

How to connect your AI assistant

Claude, Claude Desktop and Claude Code sign in over OAuth. You sign in to FrankKi in a browser window, create your account there if you need one, and allow access. You only need a token for scripts and servers.

Claude on the web or in the desktop app

Anthropic's guide

In Claude, open Customize > Connectors.
Click + Add, then Add custom connector.
Name it FrankKi, paste this URL and click Continue.
https://mcp.frankki.app
Keep the detected settings and click Continue. Under Authentication choose Sign in now, then click Add.
In the window that opens, sign in with your FrankKi account or create one. New accounts get a code by email, which you enter. If you have not signed the data processing agreement yet, you sign it here. Then allow access.

Claude Team or Enterprise: an owner adds it once under Organization settings > Connectors (Add, then Custom > Web). Everyone else clicks Connect on it under Customize > Connectors.

Claude Code

One command in your terminal:

claude mcp add --transport http frankki https://mcp.frankki.app

Then run /mcp in Claude Code, pick frankki and sign in in your browser.

ChatGPT

In ChatGPT you add FrankKi as a custom MCP server with the URL https://mcp.frankki.app and OAuth sign-in. ChatGPT does not offer this on every plan, and OpenAI moved the menu more than once in 2026, so the current steps are in OpenAI's guide. Once FrankKi is connected, send the setup prompt below in a new chat.

OpenAI's guide (opens in a new tab)

Then: the setup prompt

This is a plain message to your assistant. You do not need to understand it, just send it in a new chat. Your assistant then sets up your sender details, letterhead and one to three templates, and asks you before it saves anything. It sends and pays for nothing without your approval.

Connect FrankKi at https://mcp.frankki.app so we can send letters by post. Ask me before you connect or grant permissions. Then run the FrankKi connection check mcp_health to see what my account still needs, and walk me through the setup step by step. Take our sender details and brand from our website and ask me once before you save them. Copy 1 to 3 templates that fit my business and show me one preview. For steps only I can do, such as a top-up, give me the link. Without my approval you send nothing and pay for nothing. Never switch on autopilot yourself.

Open Claude with the setup prompt

For developers and servers

For scripts, servers and clients without a sign-in window, create a token under /dashboard/tokens with exactly the rights you need. It is shown once. The transport is streamable HTTP.

Claude Code with a token

For runs without a browser.

claude mcp add --transport http frankki https://mcp.frankki.app \
  --header "Authorization: Bearer ${FRANKKI_API_KEY}"

Claude Desktop via config file

Only if you use claude_desktop_config.json instead of Connectors. mcp-remote opens your browser to sign in.

{
  "mcpServers": {
    "frankki": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://mcp.frankki.app"]
    }
  }
}

Config file with a token

For clients that only start local servers, without a browser sign-in.

{
  "mcpServers": {
    "frankki": {
      "command": "npx",
      "args": [
        "-y", "mcp-remote", "https://mcp.frankki.app",
        "--header", "Authorization: Bearer ${FRANKKI_API_KEY}"
      ]
    }
  }
}

Cursor

.cursor/mcp.json for one project, ~/.cursor/mcp.json for all of them.

{
  "mcpServers": {
    "frankki": {
      "url": "https://mcp.frankki.app",
      "headers": {
        "Authorization": "Bearer ${FRANKKI_API_KEY}"
      }
    }
  }
}

Developer docs →

Before you sign up

Your first letter, step by step

From creating the account to your first approved letter takes about 11 minutes. Without an AI assistant it is 2 minutes less. The times are rough estimates.

Create your accountabout 1 minute
Name, email and what describes you. Creating it costs nothing. Then you set your password with a link we email you, valid for 30 minutes. If you start in Claude, you create the account in the sign-in window and enter the code from the email.
Connect Claudeabout 2 minutes
The five clicks from the steps above. You can do this later, or not at all. Without an AI assistant you write your letters in the browser.
Sign the data processing agreementabout 2 minutes
The GDPR requires this agreement (AVV) because we process the addresses in your letters for you. You sign once by typing your name. If you connect Claude, the sign-in window asks for it. Otherwise you sign it during setup in the dashboard.
Enter your sender detailsabout 2 minutes
Name, address and the legal details for every letter. You enter them yourself in the dashboard, or your AI assistant takes them from your website and asks you before saving. Your own letterhead is optional. Until then FrankKi prints on the standard letterhead.
Top up your balanceabout 1 minute
From EUR 10, on a Stripe page. The balance does not expire.
Check and approve your first letterabout 3 minutes
Your assistant creates the letter, or you write it yourself in the browser. You see the preview and the price and approve it. Only then is it printed and charged.

What does trying it cost?

Nothing, as long as nothing is sent. Drafts, previews, price quotes and a dryRun rehearsal are free. The rehearsal needs your sender details and the signed data processing agreement (AVV). The GDPR requires that agreement because we process the addresses in your letters. Money only moves when you approve a letter.

How much do I have to top up?

At least EUR 10 and at most EUR 500 per top-up, paid on a Stripe page. The balance does not expire, and there is no subscription. EUR 10 covers 5 standard letters on the first price rung. FrankKi is a small business under § 19 of the German VAT Act (UStG) and charges no VAT. The price shown is the final price.

Do I need a company?

No. Freelancers, sole traders and small businesses are welcome. Pick "Freelance or small business" when you sign up, and we ask only for what we need.

Create a freelancer account

I already have a PDF. Can FrankKi send it?

As an attachment, yes. As the letter itself, no. FrankKi lays out the letter from your text or invoice line items in DIN 5008 on your letterhead. Your finished PDF, say an invoice or a service charge statement from your software, goes behind a short cover letter. The price depends on all pages together, cover letter and attachment, up to 30 pages per letter. There is no fixed price per page. You see the amount for your letter in the preview before you approve. In the browser you drop the PDF into the attachments step. Without a cover letter it works like this: FrankKi rebuilds the invoice from your line items and, once it is sent, also gives it to you as a ZUGFeRD PDF and XRechnung.

Example for Claude

Send this invoice PDF as an attachment with a short cover letter to Müller GmbH, Hauptstraße 1, 10115 Berlin. Show me the preview and the price before I approve.

Does it work without an AI assistant?

Yes. In the dashboard you write letters yourself in the browser. For an invoice, payment reminder or dunning letter you enter line items and amounts, FrankKi adds up the totals and puts everything on your letterhead. You attach PDFs, see the preview and the price, then approve. To send to many recipients at once, use your assistant.

Create your account and start

Signup is open and needs no manual approval. A name and an email address are enough, you do not need a company. We email you a link to set your password. Then you connect your assistant if you want, sign the data processing agreement, enter your sender details and top up.

Start free I already have an account

Free to create, no setup fee, no subscription. Top up from EUR 10 on a hosted Stripe Checkout page, and the balance does not expire. Only real send orders debit it.

How much does a letter cost

If you send a few letters a month, a German standard letter in black and white costs EUR 1.99. That applies under 20 letters a month. The more you send in a month, the less each letter costs: EUR 1.89 from 20 letters, EUR 1.79 from 100 letters, EUR 1.69 from 500 letters, EUR 1.59 from 1,000 letters. The rung you reach applies to every letter that month, including the first. Colour, registered mail and other countries cost more. Your assistant tells you the exact price before every send (shipping_quote). You pay from a prepaid wallet that you top up on a hosted Stripe Checkout page, and order_send debits that wallet. MCP never collects card data in the agent interaction. There is no subscription. FrankKi is a small business under § 19 of the German VAT Act (UStG) and charges no VAT. The price shown is the final price.

Per-letter prices with FrankKi MCP
Product	Price per letter	Detail
Standard letter, black and white	EUR 1.99	Under 20 letters a month, per letter
Volume tier	EUR 1.89	From 20 letters a month, every letter that month
Volume tier	EUR 1.79	From 100 letters a month, every letter that month
Volume tier	EUR 1.69	From 500 letters a month, every letter that month
Volume tier	EUR 1.59	From 1,000 letters a month, every letter that month
Standard letter in colour	EUR 2.09	Under 20 letters a month, down to EUR 1.69 from 1,000 letters
Registered (Einwurf)	EUR 5.99	Proof of posting, no signature. Under 20 letters a month, down to EUR 5.59 from 1,000 letters
Registered (Übergabe)	EUR 6.39	Handed over against signature. Under 20 letters a month, down to EUR 5.99 from 1,000 letters

Inside Germany we estimate 2 to 4 working days from the handover to our print partner, or 3 to 5 if it gets the letter after noon.

Fixed prices across DACH (DE, AT, CH). Worldwide via local partners and DHL, quoted per destination.

Who is FrankKi MCP for

FrankKi MCP is for anyone who wants an AI assistant to send real letters, from sole traders to law firms. Connect once at https://mcp.frankki.app and turn a draft into a posted letter in the same conversation, delivered worldwide.

Law firms

Draft client and counterparty letters in your assistant and send them as registered mail with proof of posting or signature on delivery where the destination supports that service, with tracking according to the selected service level.

Create a firm account

Tax advisors

Send document requests, deadline reminders and fee invoices to your clients, in batches too. You pick the letterhead per letter or per template, and the salutation is part of the letter text, so your clients get the formal tone they expect. Every letter waits for your approval.

Create a firm account

Freelancers and small businesses

Send invoices and reminders to clients who want paper instead of email. You need no company and no subscription, only some balance.

Create a freelancer account

Agencies

Run mailings and per client outreach from one connection, send single letters or batches with order_send_batch, and keep every dispatch tracked and auditable.

Developers

Wire FrankKi MCP into agents and pipelines over plain streamable HTTP. Draft, quote, send and track letters with 68 model-visible tools and a single scoped Bearer API key.

Letter design

Give your agent existing stationery or a logo. It rebuilds them as a FrankKi letter design, creates a real sample letter for review, and saves the result only after you have checked it.

How secure is the connection

Chat assistants sign in to FrankKi MCP over OAuth 2.1 with PKCE, and scripts use scoped Bearer API keys. Each send runs through the same fulfillment safety net as the FrankKi app. MCP partners fund a prepaid wallet through a hosted Stripe Checkout page and sends debit that wallet. Read tools never change state, action tools are explicit, and every physical dispatch waits for a human decision unless that human switched on autopilot. For regulated mail there is Einschreiben (registered mail) with an Einlieferungsbeleg (proof of posting) where supported, separated Mandanten (client matters) and approval flows.

Authenticated calls

Every request carries an OAuth access token from the sign-in window, or a scoped Bearer API key for scripts and servers.

Read and action are separate

Read tools return state and never send mail. Action tools such as order_send are explicit, so an agent cannot post a letter by accident.

Approval queue

Every physical dispatch enters the approval queue, and a human decides before the letter leaves, unless that human switched on autopilot in the dashboard. Autopilot covers standard letters from released templates to known recipients, within daily and monthly limits, and each letter waits 10 minutes so it can still be stopped. Every decision is logged.

Proven fulfillment

Sends run through the same fulfillment pipeline that already powers the FrankKi app. The partner wallet is funded separately through hosted Stripe Checkout and debited on send.

What is FrankKi MCP

FrankKi MCP is a hosted MCP server for physical mail. It connects Claude, ChatGPT, Cursor and your own agents to FrankKi's letter service through 68 model-visible tools. Your assistant drafts a letter formatted to the German DIN 5008 standard, tells you the price, sends it worldwide once you approve it, and tracks delivery.

We built FrankKi MCP so an agent can finish the job. It does not stop at the draft, it puts the letter in the post.
FrankKi founder

Every send goes through the same fulfillment safety net as our app. MCP partners fund a prepaid wallet through hosted Stripe Checkout, and the send debits that wallet. The MCP layer is a clean interface on top of a proven pipeline.
FrankKi operations

Frequently asked questions

How do I send a physical letter via MCP

Connect your assistant to FrankKi MCP at https://mcp.frankki.app and sign in. Then ask it for the letter: it calls letter_create_draft to build it and order_send to put it in the post once you approve. FrankKi prints and mails it worldwide, and order_status tracks it.

Is FrankKi MCP live yet

Yes. Add https://mcp.frankki.app as an MCP server in Claude, ChatGPT, Cursor or VS Code and sign in over OAuth. You can create your account in the sign-in window or beforehand at frankki.app/dashboard/registrieren. There is no manual account approval.

What exactly is FrankKi MCP

FrankKi MCP is a hosted MCP server for physical mail that lets AI assistants draft, price, send and track real letters worldwide. You connect your AI client once, and from then on an approved draft becomes a printed and delivered letter. Agents and people use the same pipeline.

How do I connect FrankKi MCP

In Claude, open Customize > Connectors, add a custom connector with the URL https://mcp.frankki.app and choose "Sign in now". In the browser window you sign in to FrankKi or create an account. In Claude Code, run claude mcp add --transport http frankki https://mcp.frankki.app, then sign in through /mcp. You only need a token for scripts and servers.

Do I need an API token

Not for Claude, Claude Desktop, Claude Code or ChatGPT. They sign in over OAuth. You only need a token from /dashboard/tokens for scripts, servers and clients without a sign-in window, such as Cursor with a fixed config.

Which AI assistants are supported

Any MCP client that speaks streamable HTTP, including Claude, Claude Code, ChatGPT, Cursor and VS Code. Whether you may add a custom MCP server in ChatGPT depends on your ChatGPT plan. The same connection serves a chat assistant and an unattended agent, so people and agents share one pipeline.

How much does a letter cost

Under 20 letters a month a German standard letter in black and white costs EUR 1.99. After that the price drops: EUR 1.89 from 20 letters, EUR 1.79 from 100 letters, EUR 1.69 from 500 letters, EUR 1.59 from 1,000 letters. The rung you reach applies to every letter that month, including the first. In colour it is EUR 2.09 (down to EUR 1.69), registered Einwurf EUR 5.99 (down to EUR 5.59), registered Übergabe against signature EUR 6.39 (down to EUR 5.99). shipping_quote returns the exact destination price before any send. MCP partners top up a prepaid wallet through a hosted Stripe Checkout page, and order_send debits that wallet. MCP never collects card data in the agent interaction. FrankKi is a small business under § 19 of the German VAT Act (UStG) and charges no VAT. The price shown is the final price. Inside Germany we estimate 2 to 4 working days from the handover to our print partner, or 3 to 5 if it gets the letter after noon.

Which tools does FrankKi MCP offer

FrankKi MCP offers 68 model-visible tools, split into read and action. Read tools such as shipping_quote, order_status and letter_list fetch data without changing anything. Action tools such as letter_create_draft, order_send and approval_submit create, send or change letters and orders straight from your AI assistant.

Does drafting a letter cost anything

No. Drafts (letter_create_draft), previews (letter_preview) and a rehearsal with order_send and dryRun: true are free. Only a real send debits your prepaid wallet. If the balance is too low, top it up outside the chat on a hosted Stripe Checkout page.

Why does Claude ask before every tool

Claude asks before each tool call on a custom connector and offers "Always allow". FrankKi marks every read tool as read-only and every send as destructive, so split it that way: in Claude open Settings, Connectors, FrankKi, and set the read-only tools to "Always allow". Leave sending, cancelling and approving on ask. A letter only goes to the post after you approve it, whatever you choose here: in the FrankKi dashboard or, if you allowed it when connecting, right in the chat. The exception is autopilot, which only you can switch on in the dashboard.

How secure is the connection

Every call to FrankKi MCP is authenticated: chat assistants over OAuth 2.1 with PKCE, scripts and servers with Bearer API keys that carry only the rights you grant. Read tools never change state, and every physical dispatch waits for human sign-off unless you switch on autopilot.

Are the letters legally valid

FrankKi helps draft, format and physically send letters, but it does not determine whether a particular letter is legally sufficient or legally effective. That depends on matters such as content, authority, form, signature, recipient and deadlines. DIN 5008 governs presentation, not legal effect. Registered mail can provide the applicable posting or delivery record where the destination supports it. FrankKi does not provide legal advice.

Which countries can my agent send letters to

FrankKi MCP sends worldwide. Local postal tariffs apply across DACH (Germany, Austria, Switzerland) and several European countries, and the rest of the world is served by DHL in typically 4 to 18 business days. International prices are quoted per destination, so shipping_quote returns the exact amount before your agent sends anything.

Can I use FrankKi MCP for regulated client mail

Yes. FrankKi MCP is built for correspondence that has to hold up: registered mail with an Einlieferungsbeleg (proof of posting) or handover against signature where supported, DIN 5008 typesetting, separated Mandanten (client matters), and approval flows where a human decides before a letter leaves. You can rehearse the whole path first with dryRun: true, which runs the same checks and pricing and returns a preview without printing or charging anything.

What makes FrankKi MCP different from other letter APIs

FrankKi MCP is German and DACH native and still delivers worldwide, while most agent facing mail APIs are built around US mail and established letter APIs have no agent story at all. On top of that it carries Einschreiben with Einlieferungsbeleg, DIN 5008, Mandanten separation, approval flows, and wallet-funded sends without a subscription or card collection in the MCP chat.

How dispatch works with FrankKi MCP

Automated

Every letter runs automatically from the AI assistant to postal handover, with no manual printing or stuffing envelopes on your side.

An operator monitors every send today, on top of the automated pipeline. Once enough real dispatches are measured, we will add a measured delivery rate here.

Which tools does the server have

FrankKi MCP exposes 68 model-visible tools (40 read-only, 28 action). Read tools such as shipping_quote, order_status and letter_list never cost money or send mail. Action tools such as letter_create_draft (free) and order_send create drafts, send letters and manage approvals. The split derives from each tool's mutating flag.

Show all 68 tools (for developers)

Tool	Access	Purpose
Profile and wallet
`profile_get`	Read	Reads your partner profile and account data.
`wallet_balance`	Read	Shows your current wallet balance and daily cap.
`wallet_topup_link`	Read	Returns a Stripe link to top up your wallet.
`sender_profile_list`	Read	Lists your saved sender profiles.
`sender_profile_get`	Read	Reads a single sender profile in detail.
`sender_profile_validate`	Read	Checks a sender profile for mandatory details and format.
Clients
`mandant_get`	Read	Reads a single client by its ID.
`mandant_list`	Read	Lists your clients with filters and pagination.
`mandant_search`	Read	Searches clients by number, name, tag or case handler.
Templates
`template_list`	Read	Lists your letter templates with category and version.
`template_get`	Read	Reads a template including its merge fields.
`template_apply_with_merge_fields`	Read	Fills a template placeholders and returns subject and content.
`template_diff_check`	Read	Compares a letter against its template and shows the differences.
`template_save`	Action	Saves a template as a draft version.
`template_release`	Action	Releases a draft version so it becomes sendable.
`template_archive`	Action	Archives a template without deleting it.
`template_draft_discard`	Action	Discards a draft version that has not been released yet.
Letters
`letter_get`	Read	Reads a single letter with status, content and PDF link.
`letter_list`	Read	Lists your letters with filter and paging options.
`letter_search`	Read	Full-text searches your letters across subject, recipient and content.
`letter_create_draft`	Action	Creates a letter draft. Free, without sending.
`attachment_upload_pdf`	Action	Attaches a PDF to a letter draft.
`attachment_upload_image`	Action	Attaches an image to a letter draft and scales it to A4.
`shipping_quote`	Read	Calculates the price of a letter by destination country and mail type.
`pricing_tiers`	Read	Returns the volume tiers: from which monthly quantity which per-letter price applies.
`order_status`	Read	Reads the dispatch and delivery status of an order.
`order_einlieferungsbeleg`	Read	Returns the proof of posting for a sent order.
Addresses and export
`address_validate`	Read	Validates an address with the mail provider without storing it.
`address_upsert`	Action	Creates or updates an address in the address book.
`address_list`	Read	Lists the addresses in your partner address book.
`address_search_company`	Read	Searches companies and authorities in the directory with their mailing address.
`archive_export`	Read	Starts an archive export for accounting, DATEV or DMS.
`archive_export_status`	Read	Queries the status of an archive export and returns the download link.
Sending and actions
`order_send`	Action	Sends a letter by post and charges your wallet.
`order_send_batch`	Action	Sends several letters in one batch with a single approval.
`order_cancel`	Action	Cancels an order as long as it has not been printed yet.
`order_fix_resubmit`	Action	Corrects the recipient address of a rejected letter and resubmits it.
`letter_schedule`	Action	Schedules the dispatch of a draft for a later time.
`schedule_list`	Read	Lists scheduled sends with date, status and reserved amount.
`schedule_cancel`	Action	Cancels a scheduled send and releases the reserved amount.
Approvals
`approval_list`	Read	Lists open letters in the approval queue.
`approval_submit`	Action	Submits a letter for human approval.
`approval_decide`	Action	Approves a letter after explicit consent, or rejects it.
Presets and uploads
`preset_save`	Action	Saves a sending preset for recurring letters.
`signature_upload`	Action	Uploads a signature as PNG and stores it.
`signature_list`	Read	Lists your saved signatures with a preview link.
`letterhead_upload`	Action	Uploads a letterhead and stores it.
`letterhead_list`	Read	Lists your saved letterheads with a preview link.
Letter design
`letter_design_save`	Action	Saves a reusable letter design and checks the delivery clear zones.
`letter_design_list`	Read	Lists your saved letter designs.
`letter_design_preview`	Read	Renders a preview PDF of a letter design.
`letter_design_delete`	Action	Archives a letter design so it is no longer used.
Operations
`mcp_health`	Read	Checks your token and the processing chain with an echo probe.
More tools
`sender_profile_upsert`	Action	Creates or edits a sender profile: legal form, mandatory details, optionally bank details, disclaimer and default letterhead.
`analytics_summary`	Read	Returns the partner account's aggregated metrics: letters per month, cost per mandant for rebilling, transit times to delivery, failure rates, and spend against configured limits.
`letter_upload_pdf`	Action	Uploads a finished letter PDF that is sent exactly as it is.
`setup_fix_link`	Read	Hands one item over to the human in a browser: top up the balance, sign the data processing agreement or complete the sender profile.
`template_clone_from_library`	Action	template_clone_from_library copies one to five FrankKi standard templates into the account's own templates in one call, such as invoice, dunning letter, quote, cancellation or letters to authorities, and shows the first as an image.
`letter_design_list_presets`	Read	Returns the owner-approved native-v2 letterheads as safe starting points for cancellations, invoices, payment reminders, quotes, contracts and letters to public authorities.
`brand_kit_get`	Read	Reads the saved brand values for the user-facing result letterhead and brand.
`brand_kit_save`	Action	Saves logo references, colours and font for the user-facing result letterhead and brand.
`brand_import_from_website`	Action	Reads a public company website and proposes a letterhead design from it: brand colours, a mapped house typeface, logo candidates and company details from the imprint.
`brand_setup_from_website`	Action	Company website to sender, brand and letterhead in two calls.
`letter_preview`	Read	Renders a letter, draft or form as images, composed like a real send, and returns inline PNGs, PDF link, page count, cost and designRender with the actual documentMode, rendered letter chrome and bodyStartMm.
`template_preview`	Read	Renders a STORED template with sample values and returns inline PNGs, PDF link and designRender.
`document_create`	Action	Turns a structured billing payload into a finished document and stores it as a letter draft: FrankKi re-computes line items, net, VAT rates and gross, checks the mandatory details under § 14 UStG, optionally draws the document number from the account's sequence, and typesets everything in the DIN 5008 layout with the sender's letter design.
`document_list`	Read	Lists the account's created documents (invoice, payment reminder, dunning letter, credit note), newest first, filtered by type, client, recipient or referenced document.
`document_get`	Read	Returns one document with its full payload (line items, totals, VAT rates, reference) plus the letterId and orderId of the letter it lives in.

Connect your agent

Physical-mail setup and provider guides

Connect your agent to FrankKi, prepare a letter and review it before sending. These guides also cover delivery methods, spending limits and provider choices.

Connect FrankKi MCP today

Add https://mcp.frankki.app as a connector in Claude and sign in. You create your account on the way if you do not have one. Top up from EUR 10, and your assistant sends real letters for EUR 1.99 each, down to EUR 1.59 on volume, with no subscription. You see the exact price before every send.

Create your account and start

Start free I already have an account

Free to create, no setup fee, no subscription. Top up from EUR 10 on a hosted Stripe Checkout page, and the balance does not expire. Only real send orders debit it.