MCP server for AI assistants
Send registered letters from your AI assistant
Ask Claude, ChatGPT, Cursor or Grok what a letter costs, send a PDF and check delivery. You approve every letter before it goes out.
https://sendregistered.com/mcp
- In Claude, open Settings › Connectors and choose Add custom connector.
- Name it SendRegistered and paste the URL.
- Choose Connect and sign in to SendRegistered.
Works on claude.ai, the desktop app and mobile.
https://sendregistered.com/mcp
- In ChatGPT, open Settings › Apps and connectors and add a custom connector.
- Paste the URL and choose OAuth as sign-in.
- Sign in to SendRegistered, then pick SendRegistered in a chat.
Add to CursorOpens Cursor with the server filled in. You can also paste the snippet into .cursor/mcp.json in a project, or into mcp.json in your home folder. Cursor then asks you to sign in.
Or add to .cursor/mcp.json
{
"mcpServers": {
"sendregistered": { "url": "https://sendregistered.com/mcp" }
}
}https://sendregistered.com/mcp
- Open grok.com/connectors.
- Choose New Connector, then Custom.
- Paste the URL and sign in to SendRegistered.
On a Business or Enterprise plan, an admin adds the connector first. In the xAI API, add a tool with type mcp, the server URL and a label. Streaming HTTP and SSE are supported.
Your assistant, connected to SendRegistered
reminder-4471.pdf
Send this PDF as an Einschreiben to Hausverwaltung Berger, Kastanienallee 12, 10435 Berlin.
Send this PDF as an Einschreiben to Hausverwaltung Berger, Kastanienallee 12, 10435 Berlin.
create_order
Here is the letter. Nothing is charged yet.
Here is the letter. Nothing is charged yet.
ToHausverwaltung Berger GmbH, BerlinProductEinschreiben EinwurfPages2, black and whitePrice€7.95
Approve and payChange
What does a registered letter to France cost?
get_quote
A lettre recommandée is €11.95 for up to 2 pages. With a signed return receipt (LRAR) it is €13.95.
A lettre recommandée is €11.95 for up to 2 pages. With a signed return receipt (LRAR) it is €13.95.
Is my letter to Lyon delivered?
get_order_status
Yes. La Poste delivered it on 4 November at 10:42. The proof PDF is ready.
Yes. La Poste delivered it on 4 November at 10:42. The proof PDF is ready.
Sign-in and payment
What happens when your assistant sends a letter?
1
You connect onceSign in to SendRegistered and choose what the assistant may do.2
It prepares the letterUpload, address check and price. Nothing is charged.3
You approveYou see the recipient, product, pages and price first.4
We post itPrinted in the destination country, with tracking and proof.Pay per letter
After you approve, the assistant gives you a payment link. You pay on our checkout page. Until you have paid, the letter stays a draft.
For everyone
Pay from credit
The letter is paid from your prepaid credit, within the daily and monthly limit you set for this connection. Otherwise you pay that letter on our checkout page. A letter priced in Swiss francs is paid there too.
For verified businesses with credit or a subscription
Tools
What can your assistant do?
Nine tools in three groups. Your assistant picks the right one.
Look up No extra permission
Prices, products and the rules per country.
List destinations
list_destinationsThe countries you can send to now, with each registered product on sale and its price.Get a quote
get_quoteThe price of one letter: destination, number of pages, colour and return receipt where offered.Which letters must be registered
registered_mail_requirementsWhether a letter type (such as a tenant notice or a resignation) must go by registered mail in a country, with deadlines and official sources.Send Send permission
From PDF to posted letter, with your approval.
Upload a document
upload_documentStores your PDF for an order and checks that it can be printed. You get a one-time upload link or send the file directly.Create an order
create_orderPrepares the letter with sender and recipient address and shows the price. Nothing is charged and nothing is printed yet.Confirm and pay
confirm_and_payAfter you approve the order: pays from your prepaid credit within this connection's limit, or returns a checkout link for that letter when the credit or the limit is not enough. A letter priced in Swiss francs uses that checkout link too.Withdraw an order
withdraw_orderCancels a paid letter and refunds it, as on the website, as long as it has not been handed to the post yet.Track Read permission
Status and proof of your letters.
Get order status
get_order_statusStatus, price and tracking number of one of your letters.Get proof certificate
get_proof_certificateThe proof facts of a posted letter: document fingerprints, timestamps and tracking.Permissions and security
How do you stay in control?
You approve every letter
The assistant shows the summary first. Keep tool approval on in your assistant as well.
A limit per connection
Choose how much a connection may spend per day and per month from your credit.
Read or send
Give an assistant read access only, or also the right to send.
Your documents
PDFs are stored encrypted in the EU and used only to print your letter.
PDF sizeUp to 8 MB
Pages per letter1 to 20
Upload link valid15 minutes
Letters per daySet per account and connection
See our privacy policy and terms, or reach us via the contact form.
Questions about the MCP server
Which assistants can connect?
Any assistant that supports remote MCP servers with sign-in: Claude, ChatGPT, Cursor, Grok and others. Use the URL above.
Do I need a SendRegistered account?
You sign in when you connect the assistant. Prices and the registered-mail rules need no extra permission. Sending and tracking use the permission you grant at sign-in.
Can the assistant send a letter without me?
Not on its own. It shows you the letter and the price, and only sends after you approve. If you let it pay from credit, it stays within the limit you set for that connection.
Does it cost more than the website?
No. Same prices, same products, same proof. Credit and subscriptions lower the price per letter in the same way.
How do I disconnect an assistant?
In your account under API keys and connections, choose Disconnect. The assistant loses access straight away.
For client developers: endpoints and sign-in
| Server | https://sendregistered.com/mcp (Streamable HTTP, sign-in required) |
| Public lookup | https://sendregistered.com/mcp/public (the three lookup tools, no token) |
| Sign-in | OAuth 2.1 with PKCE and dynamic client registration |
| Scopes | letters:read status and proof · letters:write upload, order, pay, withdraw |
| Resource metadata | https://sendregistered.com/.well-known/oauth-protected-resource/mcp |
| Authorization server | https://sendregistered.com/.well-known/oauth-authorization-server |
| OAuth endpoints | https://sendregistered.com/oauth/authorize · https://sendregistered.com/oauth/token · https://sendregistered.com/oauth/register · https://sendregistered.com/oauth/revoke |
Building your own integration?
Use the API with keys, spending limits and signed events.