Install Jentic One Beta

Connect the Kundenschreiber Public API to your agent

Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the Kundenschreiber Public API, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.

Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.

Step 1: Jentic One Host machine

# On the machine that will host your Jentic One instance:
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2Fapi.kundenschreiber.de%2Fkundenschreiber" | sh

Step 2: Agent machine

# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2Fapi.kundenschreiber.de%2Fkundenschreiber" | sh
jentic register       # connects your agent to your Jentic One instance

Jentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.

Capabilities

What an agent can do with Kundenschreiber Public API.

Create and list mailing orders for handwritten letters and postcards

List letter, postcard, and envelope templates available for an order

Manage senders and recipients used across mailings

Create and update QR code campaigns and the codes within them

List funnels and manage reusable signatures with their variations

GET STARTED

Start building with Kundenschreiber Public API

Explore with Jentic One

View OpenAPI Document

Use Cases

Patterns agents use Kundenschreiber Public API for, with concrete tasks.

★ Automated Direct Mail Agent

An AI agent turns a triggering event, such as a new signup or a churn risk, into a physical mailing. It selects a template, resolves the sender and recipient, and creates the order through Kundenschreiber. Through Jentic the agent discovers the order and template operations by intent and calls them directly, so a handwritten touchpoint goes out without manual work.

Create an order that sends a handwritten welcome letter to a new customer using a chosen template

QR Campaign Management

Attach trackable QR codes to printed mailings so response can be measured. The agent creates a campaign, generates codes, and updates them as the campaign runs. This ties physical mail back to digital funnels without leaving the API.

Create a QR campaign and generate a code to print on an upcoming postcard mailing

Recipient and Sender Management

Keep the address book behind mailings current by adding recipients, updating sender details, and removing entries that are no longer used. This lets an agent prepare a clean recipient list before an order is created, so mailings reach the right addresses.

Add a new recipient and confirm the sender details before creating a mailing order

Key Endpoints

33 endpoints — jentic publishes the only available openapi specification for the kundenschreiber public api, keeping it validated and agent-ready.

METHOD

PATH

DESCRIPTION

POST

/orders

Create a mailing order

GET

/orders/{id}

Get order details

GET

/templates

List letter and postcard templates

POST

/qr/campaigns

Create a QR code campaign

GET

/shipment-balance

Get shipment credit balance

POST

/orders

Create a mailing order

GET

/orders/{id}

Get order details

GET

/templates

List letter and postcard templates

POST

/qr/campaigns

Create a QR code campaign

GET

/shipment-balance

Get shipment credit balance

Why Jentic?

What agents get from Jentic-routed access to this vendor.

Setup

Wiring the Kundenschreiber API by hand means handling its X-API-Key auth, resolving senders, recipients, and templates, and posting orders yourself. Through Jentic you install once, import Kundenschreiber from the API Directory, store the key once, and your agent calls it.

Permission scoping

Kundenschreiber identifies orders, senders, and recipients by an id in the request path, so a rule bounds which operations your agent may call. You choose those operations, so destructive ones like deleting a sender or recipient are not included unless you add them.

Credential isolation

Your Kundenschreiber API key is stored once, encrypted, by your own Jentic One instance and injected at execution time. It never enters the agent's prompt, logs, or context.

Intent-based discovery

Agents search Jentic by intent such as 'send a handwritten letter' or 'create a mailing order', and Jentic returns the matching Kundenschreiber operation with its input schema so the agent calls the right endpoint without browsing the reference docs.

FAQs

Specific to using Kundenschreiber Public API through Jentic.

What authentication does the Kundenschreiber Public API use?

The Kundenschreiber Public API authenticates with an API key sent in the X-API-Key header, per its OpenAPI spec. Through Jentic the key is stored encrypted by your own Jentic One instance and injected at call time, so it never enters the agent's prompt or logs.

Can I send a handwritten letter with the Kundenschreiber Public API?

Yes. Choose a template, resolve the sender and recipient, and create the mailing with POST /orders. GET /templates lists the letter and postcard templates you can use, and GET /shipment-balance shows the credit remaining.

What are the rate limits for the Kundenschreiber Public API?

The OpenAPI spec does not specify rate limits. Check the Kundenschreiber documentation at https://api.kundenschreiber.de before running high-volume mailing jobs.

Why is there no official OpenAPI spec for the Kundenschreiber Public API?

Kundenschreiber does not publish its own OpenAPI description. Jentic maintains this specification from the documented endpoints and keeps it validated so agents can call the API reliably.

Is there a Kundenschreiber MCP server?

You don't need an MCP server to give your agent the Kundenschreiber API. Jentic connects it directly from the API Directory: import it, store your key once, and your agent calls the order and template operations it needs.

Can I limit what my agent is allowed to do with the Kundenschreiber Public API?

Yes. Write a rule that allows only the order and template operations, so the agent can prepare and send mailings but cannot delete senders or recipients, and every call it makes is logged.

How do I send a mailing with the Kundenschreiber Public API through Jentic?

Search Jentic for 'send a handwritten letter', and it returns the POST /orders and GET /templates operations with their input schemas so your agent creates the mailing directly. To run it on your own infrastructure, install Jentic One from its GitHub repo.

Kundenschreiber De Kundenschreiber Public API

Name: Kundenschreiber Public API
Brand: Kundenschreiber Public API
Availability: InStock

Agent-ready OpenAPI document · curated by JenticMarketingMarketing AutomationapiKey33 EndpointsREST

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For Agents

Create and send handwritten letters and postcards, managing orders, templates, senders, and recipients. Run QR code campaigns and funnels, and check the remaining shipment credit balance.

Use for: Send a handwritten letter to a recipient, Create a new mailing order, List the available letter and postcard templates, Add a recipient for an upcoming mailing

Not supported: Does not handle email delivery, payment processing, or address verification. Use for handwritten letter and postcard mailings only.

Jentic publishes the only available OpenAPI specification for the Kundenschreiber Public API, keeping it validated and agent-ready. The Kundenschreiber Public API creates and sends handwritten letters and postcards, managing the orders, templates, senders, and recipients behind each mailing. It also runs QR code campaigns and funnels, stores reusable signatures, enriches company records, and reports the remaining shipment credit balance.

Jentic One on Github View OpenAPI Document

Connect the Kundenschreiber Public API to your agent

Capabilities

Start building with Kundenschreiber Public API

Use Cases

Key Endpoints

Why Jentic?

Related APIs

FAQs

Kundenschreiber De Kundenschreiber Public API