How do you create and use an API key?

In Maison Cartouche, open Account, then Agents, and create a key. A test key starts with odk_test_ and nothing is made or posted. A live key starts with odk_live_. Set the policy for what the key may send, and call the API with the key as a bearer token.

How is privacy protected in the API?

The API never returns addresses, emails, or phone numbers. People give their own address through a private address request link. Additionally, a person who said no to gifts is never sent anything, and no person hears from agents more than twice in 30 days.

APIs & SDKs

Maison Cartouche

API for sending handwritten letters through AI agents and assistants

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An API and MCP server enabling software and AI assistants to send handwritten letters with automated moments tracking and address management.

Overview

Screenshot of the Maison Cartouche homepage

A look at maisoncartouche.com

Maison Cartouche provides an API and MCP server that allows software applications and AI assistants to send handwritten letters written by a person and photographed before posting. Developers use the same primitives as the app: people, moments, letters, policies, address requests, sends, and events.

The API includes endpoints for managing agent policies, relationships, upcoming moments with gift history, available pieces to accompany letters, and letter quotes and sends. Users can set policies controlling what kinds of letters their key may send, quantity limits per send and monthly, and approval requirements. Letters can be sent in the owner's voice with optional pieces, and senders receive tracking updates as letters move through stages from approval to delivery.

The service includes webhook events for tracking the full lifecycle of sends, address requests, and reactions. AI assistants connect via Model Context Protocol with the same key and rules, with options for OAuth-based access and assistants that connect through custom connectors like Claude.

Feature notes

Agent policy configuration with send limits and approval settings
Relationship management with contact details restricted from API
Moment tracking for birthdays and anniversaries
Letter quote and pricing with customizable upgrades
Real-time send tracking with multiple status states
Address request generation with privacy protection
Webhook event system with signature verification
OAuth support for custom connectors like Claude

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Maison Cartouche at a glance

Community votes: 0
Followers: 0
HQ: Germany

Maison Cartouche metrics

Inspection sheet for maisoncartouche.com: Ahrefs Domain Rating and Majestic link metrics, with the delta since the last inspection.
Metric	Value
Domain Rating	0 no change since last check
Trust Flow	0 no change since last check
Citation Flow	0 no change since last check
Referring domains	0 no change since last check
External backlinks	0 no change since last check

Domain Rating by Ahrefs inspected 6 Nov 2026, adjusted 5 Nov 2026. Majestic inspected 5 Nov 2026, adjusted 5 Nov 2026. Link data: Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.

Maison Cartouche domain diagnostics

Run through the diagnostics

Public RDAP record, last read 5 Nov 2026, 20:50 UTC.
Domain age	11 days
Registered	27 Oct 2026
Expires	27 Oct 2027
Registrar	InterNetX GmbH
DNSSEC	Not signed

Run the full check on maisoncartouche.com

Maison Cartouche post-launch diagnostics

Measured after Maison Cartouche went live on Launching Pro on 5 November 2026.

Domain Rating (Ahrefs): 0 no change since launch; 0 at launch (5 Nov 2026), 0 on 6 Nov 2026
Trust Flow (Majestic): 0; First measured 5 Nov 2026
Referring domains (Majestic): 0; First measured 5 Nov 2026

Day 1 since launch. Next receipt: day 30, 5 Dec 2026. The figures report a change; they do not say what caused it, and many things can. No figure here is a guess.

Biggest gains on Launching Pro

Team

Anna-Katharina SchinzelManaging director

Launch tips, free to read

The playbook on Launching Pro lists what to prepare, what to post on launch day and where else to list your product.

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FAQ

How do you create and use an API key?: In Maison Cartouche, open Account, then Agents, and create a key. A test key starts with odk_test_ and nothing is made or posted. A live key starts with odk_live_. Set the policy for what the key may send, and call the API with the key as a bearer token.
How is privacy protected in the API?: The API never returns addresses, emails, or phone numbers. People give their own address through a private address request link. Additionally, a person who said no to gifts is never sent anything, and no person hears from agents more than twice in 30 days.

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