Developers & tinkerers

Built in the open. Meant to be built on.

immoMonk is growing as the tool we want to use ourselves: a lean API, an MCP server for AI assistants and a stack without surprises. Here is what you can use today.

Public API

Read-only, no key, rate limited. Index values and rent adjustment from the same sources as the calculators on this site, plus the guide content as JSON.

GET/api/v1/public/cpi/?country=AT&month=2025-08

Index value of one month (AT: CPI 2020, from 01/2026 officially chained from the CPI 2025; DE: CPI 2020; CH: LIK), with the last published month.

GET/api/v1/public/cpi/adjust/?country=AT&base=2024-01&target=2025-08&rent=850&threshold=5

Rent adjustment from two index months, optionally with a threshold. For other countries or series: base_value and target_value instead of country/base/target.

GET/api/v1/public/articles/?locale=de

Published guide articles (list; detail under /articles/<slug>/).

GET/api/v1/public/text-blocks/?locale=de

Editable text blocks of the website (notes, liability).

curl "https://app.immomonk.com/api/v1/public/cpi/adjust/?country=AT&base=2024-01&target=2025-08&rent=850&threshold=5"

Limits, shared by all callers: 120 requests per minute for index values and 600 for content; above that the API answers 429 with Retry-After. Index values are cached for 24 hours. No availability guarantee, no personal data.

MCP server for AI assistants

immoMonk users connect their account to Claude via the Model Context Protocol and work with their own data in chat: look up contracts, record meter readings, trigger statements.

94 tools

Read, write and PDF generation for every management workflow — the same actions as in the app, secured per user.

OAuth 2.1

Sign-in through the standard consent flow, permissions in three levels (read, contacts, write). No token copying.

Public calculators as MCP

Planned: the calculators on this site as a freely usable MCP server without an account — index, deadlines, allocation.

The connector is available to beta users. Interested? Write to us via the contact form.

Stack

Deliberately boring: proven tools a small team can carry.

Django 6 + DRF

REST API, admin, tenancy-law logic, PDF generation.

FastAPI + Pydantic AI

AI agent service with audit trail.

FastMCP

MCP server, OAuth resource server in front of the Django API.

Quasar 2 / Vue 3

Mobile PWA: offline-capable, passkeys, push.

Nuxt 3

This website, content from the Django admin.

k3s + OpenTofu

Four Hetzner VPS in Nuremberg, Kubernetes, infrastructure as code.

Build along, test, give feedback

We are looking for people who manage property and like tinkering with tools. Beta access, open questions about the API or an idea for a calculator: just get in touch.

Get in touch Open Live Demo