Is there an API for BGH tenancy decisions?

Yes. The REST API and the MCP server return BGH decisions on tenancy law with full text and citations. With the cited_norm filter, for example "§ 558 BGB", you narrow the search to one norm.

How do I find decisions on § 535 BGB programmatically?

Set the cited_norm filter of search_decisions to "§ 535 BGB". You get the decisions that cite this norm, including those that cite a subsection such as "§ 535 Abs. 1 BGB". The get_citation_graph tool then shows who cites a decision.

What does access cost?

Every call uses credits from your organization's balance, the same one the web app uses. A search costs 1 credit. The table above lists the price per tool. Your first organization receives 30 credits once, valid for 30 days.

How do I connect Claude, ChatGPT or Cursor?

Add the MCP address on this page as a custom connector. Claude and ChatGPT sign in with OAuth. Cursor and your own agents use an API token. The MCP documentation lists the steps for each client.

Are the case numbers in the answers real?

Every case number Klaracase returns points to a decision in the corpus, with court and date. You can fetch and read the full text at any time. The legal assessment stays with you.

API and MCP

German tenancy law: court decisions and statutes via API and MCP

The case law on §§ 535 to 580a BGB, ready for your software and your AI assistant. Service charges, owner's need and rent increases, each with case number and the norms it cites.

Decisions from 1952 to 2026.

https://klaracase.de/mcp

Built and operated in Germany

Server location: GermanyOne dedicated server hosted by Hetzner in Germany. Backups are stored encrypted in Frankfurt (eu-central-1).

Recipients disclosedEvery service that receives data from you is named in the privacy policy, with its purpose and location.

Built in GermanyBuilt for German law: court decisions, statutes and citations from German sources.

Data processing. The AI services that receive your search query process it in the EU. The providers belong to companies based in the USA. More on privacy and security

In the corpus

Decisions: 6,500+
Courts: 19
Statutes: 6
Linked citations: 28,000+

Decisions from 1 August 1952 to 9 September 2026. Measured on 11 October 2026.

Example query

One question, one call, real case numbers

A recorded query from 11 October 2026. Every case number below exists in the corpus, and the excerpts are verbatim.

Question

When is a termination for personal use of the premises an abuse of rights?

Call

search_decisions({
  "query": "Wann ist eine Kündigung wegen Eigenbedarfs rechtsmissbräuchlich?",
  "cited_norm": "§ 573 BGB"
})

Answer

VIII ZR 233/12 · BGH · 20 March 2013
[BGH — Urteil vom 20.03.2013 — VIII ZR 233/12] [Leitsatz] Eine Kündigung von Wohnraum wegen Eigenbedarfs für einen Familienangehörigen ist nicht rechtsmissbräuchlich, wenn der Eigenbedarf zwar nur kurze Zeit nach Abschluss des Mietvertrages entstanden ist, bei Abschluss des Mietvertrages aber noch n
237 C 234/20 · AG Charlottenburg · 15 March 2021
[AG Charlottenburg — Urteil vom 15.03.2021 — 237 C 234/20 | ECLI:DE:AGBECH:2021:0315.237C234.20.00] [Leitsatz] Eine von dem Erwerber einer vermieteten Wohnung zeitnah nach Eigentumserwerb ausgesprochene Kündigung wegen Eigenbedarfs ist rechtsmissbräuchlich. Jemand, der in Eigennutzungsabsicht eine v
410c C 199/19 · AG Hamburg-Bergedorf · 11 March 2021
[AG Hamburg-Bergedorf — Urteil vom 11.03.2021 — 410c C 199/19 | ECLI:DE:AGHHBE:2021:0311.410C.C199.19.00] [Leitsatz] 1. Die Durchsetzung einer Eigenbedarfskündigung kann sich als rechtsmissbräuchlich erweisen, wenn eine ebenfalls im Eigentum des Vermieters stehende Wohnung bis zum Zeitpunkt der Been

Use cases

Three ways to use Tenancy law

Service charge statements

Find BGH decisions on § 556 BGB and read the Service Charges Ordinance in the same call.

Termination for owner's need

Your agent searches with the cited_norm filter "§ 573 BGB" and gets only decisions that cite this norm.

Rent cap

Citation Check matches every case number in your complaint under § 556g BGB against the corpus.

Connect

Connect to Tenancy law in a few minutes

Tenancy law has no address of its own yet. Use the general address and narrow the search with the cited_norm filter.

Claude Code: run the command in a terminal and replace YOUR_TOKEN_HERE with your token.

claude mcp add --transport http klaracase https://klaracase.de/mcp \
  --header "Authorization: Bearer YOUR_TOKEN_HERE"

Claude.ai: add a custom connector and enter this address. You sign in with your account.

https://klaracase.de/mcp

More in the documentation: MCP documentation, REST API documentation

Coverage

What Tenancy law covers

Decisions by court

Court	Decisions
BGH	1,800+
LG	1,500+
OLG	1,000+
AG	1,000+
LSG	330+
SG	160+
VG	130+
FG	110+
OVG	100+
LVerfG	93
BVerfG	49
BFH	49
BSG	31
BVerwG	20
BAG	18
LAG	16
ArbG	10
OTHER	8
BayObLG	6

Most cited norms

Norm	Citing decisions
§ 535 BGB	1,600+
§ 546 BGB	990+
§ 543 BGB	940+
§ 536 BGB	740+
§ 556 BGB	730+
§ 573 BGB	680+
§ 558 BGB	680+
§ 566 BGB	530+
§ 569 BGB	500+
§ 550 BGB	290+

Most cited decisions

Case number	Court	Date	Cited by
1 BvR 208/93	BVerfG	26 May 1993	370+
B 14 AS 50/10 R	BSG	19 October 2010	350+
VIII ZR 302/07	BGH	27 May 2009	340+
B 4 AS 77/12 R	BSG	10 September 2013	290+
1 BvL 7/16	BVerfG	5 November 2019	210+
B 14 AS 2/10 R	BSG	19 October 2010	200+
B 14 AS 13/12 R	BSG	22 August 2012	180+
B 4 AS 19/11 R	BSG	20 December 2011	170+

Statutes in this area

BGB Bürgerliches Gesetzbuch
BetrKV Verordnung über die Aufstellung von Betriebskosten
HeizkostenV Verordnung über die verbrauchsabhängige Abrechnung der Heiz- und Warmwasserkosten
WoFlV Verordnung zur Berechnung der Wohnfläche
WoBindG Gesetz zur Sicherung der Zweckbestimmung von Sozialwohnungen
WoEigG Gesetz über das Wohnungseigentum und das Dauerwohnrecht

Measured

Measured on real questions

Measured: without sources, three AI models cited 168 of 374 case numbers we could not confirm. With our data, 1 of 471.

See the benchmark for Tenancy law

Cost

What a call costs

Every call costs a fixed number of credits. New accounts get 30 credits once, valid for 30 days.

Tool	Purpose	Credits
search_decisions	Search decisions	1
get_decision	Full text of one decision	1
get_norm	Current text of one norm	1
get_citation_graph	Citations of one decision	2
assemble_datapackage	Data package from several decisions	5
list_facets	List filter values	free

See pricing and plans

Questions

Frequently asked questions

More areas of law

Back to the overview of API and MCP

Start with Tenancy law

Data processing. The API and the MCP server use the same search as the web app. OpenRouter and Voyage AI process the text of a search query in the EU. Citation Check examines texts on our server in Germany, without AI services. More on privacy and security