Langfuse Cloud Addendum
NOT FOR EDITING
Effective date: April 10, 2026
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THIS LANGFUSE CLOUD ADDENDUM ("ADDENDUM") IS INCORPORATED INTO THE CLICKHOUSE GENERAL TERMS AND CONDITIONS OR OTHER APPLICABLE AGREEMENT BETWEEN CLICKHOUSE AND CUSTOMER AND GOVERNS CUSTOMER'S USE OF LANGFUSE CLOUD. THIS ADDENDUM BECOMES EFFECTIVE UPON THE EARLIER OF YOUR ACCEPTANCE OF THE AGREEMENT OR THE DATE YOU START USING LANGFUSE CLOUD ("ADDENDUM EFFECTIVE DATE").
EXCEPT AS OTHERWISE MODIFIED IN THIS ADDENDUM, ALL OTHER TERMS AND CONDITIONS OF THE GENERAL TERMS WILL REMAIN IN FULL FORCE AND EFFECT. ALL CAPITALIZED TERMS NOT DEFINED IN THIS ADDENDUM WILL HAVE THE MEANING GIVEN TO THEM IN THE GENERAL TERMS. ON AND AFTER THE ADDENDUM EFFECTIVE DATE, ANY REFERENCE TO THE AGREEMENT MEANS THE AGREEMENT AS MODIFIED BY THIS ADDENDUM. IN THE EVENT OF A CONFLICT BETWEEN THE TERMS OF THIS ADDENDUM AND THE TERMS OF THE AGREEMENT LESS THIS ADDENDUM, THE TERMS OF THIS ADDENDUM WILL PREVAIL FOR THE PURPOSES OF LANGFUSE CLOUD.
1. Additional Definitions
The following definitions will apply to this Product Addendum, where applicable:
1.1. "Acceptable Use Policy" means ClickHouse's acceptable use policy located at: https://clickhouse.com/legal/agreements/acceptable-use-policy.
1.2. "AI Data" means data generated or collected through Customer's or Authorized Users' use of an AI Feature, including inputs, outputs, logs, and other metadata.
1.3. "AI Feature" means any feature of Langfuse Cloud that uses generative artificial intelligence models to generate novel outputs (such as code, text, or other content) in response to user inputs.
1.4. "Langfuse Cloud" means ClickHouse's software-as-a-service for large-language-model application monitoring, analytics, and development.
1.5. "Data Processing Agreement" or "DPA" means the ClickHouse Customer Data Processing Addendum located at: https://clickhouse.com/legal/agreements/data-processing-addendum/, or, where applicable, any DPA signed by the parties and attached as an Exhibit hereto.
1.6. "Service Level Agreement" means ClickHouse service level agreement for Langfuse Cloud set forth at https://clickhouse.com/legal/agreements/langfuse-service-level-agreement.
2. ClickHouse Provision and Customer Use of Langfuse Cloud
2.1. Provision of Langfuse Cloud. During an applicable Order Form Term, and subject to the terms and conditions of the Agreement, ClickHouse will provide to Customer, and Customer is hereby granted the right to access and use Langfuse Cloud at the applicable tier purchased by Customer.
2.2. Service Level Agreement. The provision of Langfuse Cloud at the Enterprise tier is subject to the Service Level Agreement. ClickHouse may modify the Service Level Agreement from time to time, provided that no such modification will result in a material diminution during the Order Form Term of the service level described in the Service Level Agreement as of the start date on an applicable Order Form Term.
2.3. Suspension. ClickHouse may suspend Customer's access to Langfuse Cloud if (i) undisputed amounts owed to ClickHouse by Customer or Reseller are more than thirty (30) days past due, and ClickHouse has provided Customer or Reseller (as applicable) with at least ten (10) days prior written notice (email to the billing contact listed in Customer's Account sufficient) that payment is overdue, (ii) Customer's use of Langfuse Cloud materially degrades the performance of Langfuse Cloud for other customers or presents a material security risk, or risks causing material harm to ClickHouse or its other customers, (iii) Customer uses Langfuse Cloud in violation of the applicable usage restrictions in this Agreement, or (iv) where ClickHouse is required to do so by applicable law. Notwithstanding the foregoing, ClickHouse will use its commercially reasonable efforts to provide Customer with reasonable prior written notice (email to the billing contact above sufficient) of any suspension, work diligently with Customer to resolve the underlying issue, and restore Customer's access to Langfuse Cloud promptly following resolution of the underlying issue.
2.4. Customer's Use of Langfuse Cloud.
2.5. Langfuse Account. In addition to an Account, Customer must also register for a Langfuse Cloud account ("Langfuse Account"). Subject to the security obligations of ClickHouse set forth in Section 5.1 of the General Terms, Customer is responsible for maintaining the security of Customer's Langfuse Account (including, but not limited to, login credentials and the correct configuration of access control lists), and remains fully responsible for all acts and omissions that occur under Customer's Langfuse Account. Customer agrees to promptly notify ClickHouse of any unauthorized use of its Langfuse Account, or any other breaches of security related to Customer's Langfuse Account, of which Customer becomes aware.
2.5.1. Additional Restrictions on Use. Customer shall not: (i) use Langfuse Cloud to process any protected health information (as defined by the Health Insurance Portability and Accountability Act of 1996) without first entering into a Business Associate Agreement with ClickHouse or (ii) use Langfuse Cloud in violation of the Acceptable Use Policy.
2.5.2. Usage Data. ClickHouse collects tracking and operational data related to Customer's use of Langfuse Cloud, including telemetry, metadata, and feature usage information ("Usage Data"). For the avoidance of doubt, Usage Data does not include any Confidential Information (including Content) of Customer, and will not be shared with third parties (excluding ClickHouse Affiliates, contractors and service providers) in a form that identifies Customer or an individual. ClickHouse owns all right, title and interest in and to Usage Data, which it reproduces, uses, modifies and adapts to provide, maintain, protect, improve, support, and bill for Customer's use of Langfuse Cloud.
3. AI Features
3.1. AI Data. ClickHouse may use AI Data to provide, support, and improve ClickHouse products and services, but not to train or fine-tune artificial intelligence models. Customers may opt out of ClickHouse's use of AI Data for product and service improvement on a go-forward basis via an administrative setting in Customer's Langfuse Account.
3.2. Disclaimer of Warranties. OUTPUTS GENERATED BY, AND AUTOMATED OR AGENTIC ACTIONS PERFORMED BY, AI FEATURES ARE PROVIDED "AS IS," WITHOUT ANY WARRANTIES OR GUARANTEES OF ACCURACY, COMPLETENESS, APPROPRIATENESS, OR RELIABILITY.
4. Customer Content; Data Processing
4.1. Customer Responsibility for Content and Content Retrieval. Customer is solely responsible for deleting or retrieving Content from Langfuse Cloud prior to termination or expiration of an Order Form Term, and Customer acknowledges that backups, caching or references of or to deleted Content may take up to thirty (30) days to be permanently deleted.
4.2. Data Processing. The parties agree to comply with the DPA.
5. Indemnification Obligations of Customer
5.1. Obligations of Customer. Except with respect to a matter addressed under Section 8.1 of the General Terms, Customer will, at its expense (i) defend, or at its option settle, but subject to ClickHouse's prior written consent, not to be unreasonably withheld, a claim brought against ClickHouse, its contractors, suppliers, and licensors, or their respective directors, officers, employees and agents, arising out of or related to Customer's use of Langfuse Cloud in violation of applicable law or which results in the alleged infringement of the intellectual property rights of any third party, and (ii) indemnify ClickHouse against and pay (1) any settlement of such claim or (2) any damages finally awarded to such third party by a court of competent jurisdiction as the result of such claim.
5.2. Conditions. The conditions in Section 8.4 of the General Terms shall apply to Customer's obligations in Section 5.1 of this Addendum.