Terms of Service

Effective Date: February 18, 2026

Article 1 (Purpose)

These Terms of Service govern the conditions and procedures for use of the SubX service (hereinafter "Service") provided by Plumbug Studio (hereinafter "Company") through the subx.dev domain, as well as the rights, obligations, and responsibilities between the Company and its users, and all other necessary matters.

Article 2 (Definitions)

The following terms used in these Terms of Service are defined as follows:

"Service" refers to the in-app subscription payment management SaaS platform provided by the Company through the subx.dev domain and its related subdomains, encompassing all features including in-app subscription payment verification, revenue analytics dashboard, paywall builder, A/B testing, webhook events, SDK, REST API, and the underlying software and infrastructure supporting them.
"Member" refers to an individual or business entity that has agreed to these Terms of Service and created an account by registering for the Service.
"Account" refers to the credentials consisting of an email address and password combination created by a Member to access the Service, along with all associated configurations and data.
"Project" refers to an app-level subscription payment management unit created by a Member within the Service. A Member may create multiple Projects under a single Account.
"MTR (Monthly Tracked Revenue)" refers to the total in-app subscription revenue of a Member verified and tracked by the Service within a given month, denominated in United States Dollars (USD). Refunded or cancelled amounts are not excluded from MTR calculations, and MTR is determined in accordance with the Company's designated calculation methodology.
"Free Plan" refers to the pricing tier that allows Members whose monthly MTR is $2,500 USD or below to use all features of the Service at no charge.
"Pro Plan" refers to the pricing tier applicable when a Member's monthly MTR exceeds $2,500 USD, under which the Member pays a service fee equal to 1% of the total MTR for that month, including the amount exceeding the threshold.
"Paddle" refers to the third-party payment processing service (Paddle.com Market Limited) utilized by the Company for billing and payment processing of Service fees. Paddle applies solely to Service fee payments and is unrelated to Members' in-app payments (Apple App Store, Google Play).
"SDK" refers to the software development kits for iOS, Android, Web, and other platforms provided by the Company to enable Members to integrate the Service into their applications.
"API Key" refers to the authentication credentials used by Members to access the Service via REST API or SDK.
"Content" refers to all information uploaded, entered, created, or stored by Members through the Service, including data, text, configuration values, and logo images.

Article 3 (Effectiveness and Modification of Terms)

These Terms of Service become effective upon being posted on the Service interface or otherwise notified to Members.
A Member's act of registering for or using the Service shall be deemed to constitute the Member's acknowledgment that they have read, understood, and agreed to all provisions of these Terms.
The Company may amend these Terms to the extent permitted by applicable laws, including the Act on the Regulation of Terms and Conditions, the Act on the Consumer Protection in Electronic Commerce, and the Act on Promotion of Information and Communications Network Utilization and Information Protection.
When the Company modifies these Terms, it shall specify the amended content and the effective date, and provide notice via service announcements or to the Member's registered email address at least 7 days prior to the effective date (or at least 30 days prior in the case of changes unfavorable to Members or changes to material terms).
If a Member continues to use the Service after the effective date of the amended Terms, the Member shall be deemed to have agreed to the amended Terms. Members who do not agree to the amended Terms may discontinue use of the Service and withdraw their membership prior to the effective date.
Matters not addressed in these Terms shall be governed in order of priority by applicable laws and the detailed usage guidelines separately announced by the Company.

Article 4 (Provision of Service)

The Company provides Members with the following services:
- Server-side receipt validation for Apple App Store and Google Play
- Configuration and management of subscription products (Entitlements), Offerings, and Packages
- 21 types of revenue analytics charts and dashboards including MRR, ARR, churn rate, and LTV
- HMAC-SHA256 signature-based webhook event delivery (with automatic retry)
- Paywall builder and Experiments (A/B testing)
- Customer Center (self-service subscription management UI for end users)
- REST API, iOS, Android, and Web SDK
- Model Context Protocol (MCP) server
- Additional features provided by the Company from time to time
The Service is provided on a 24/7, year-round basis in principle; however, the Service may be temporarily interrupted due to system maintenance, upgrades, or force majeure events. The Company shall provide advance notice to Members where reasonably practicable.
The Company may modify the content, technical specifications, and user interface of the Service as operationally necessary, and shall provide advance notice for material changes.
For the Pro Plan, the Company targets a monthly uptime Service Level Agreement (SLA) of 99.9% or higher. The compensation procedures for SLA failures shall be set forth in a separate policy and announced in advance.

Article 5 (Member Registration and Accounts)

Any person wishing to register for the Service must agree to these Terms of Service and the Privacy Policy, and submit a registration application by entering the required information in the form designated by the Company.
The Company may decline or revoke approval of a registration application in the following circumstances:
- The application is submitted using another person's identity or false information
- The applicant is a person whose eligibility to register is restricted (e.g., persons whose accounts have been suspended for prior violations of these Terms)
- Provision of the Service is technically or operationally infeasible
- The application is made for purposes in violation of applicable laws or these Terms
Members are obligated to promptly update their registration information to ensure it remains accurate and current. The Company shall not be liable for any damages arising from inaccurate information provided by Members.
An Account may only be used by the Member to whom it belongs. Members shall not transfer or share their Account credentials (email, password, API keys, etc.) with any third party. Members bear full responsibility for all consequences arising from inadequate management of their Account security.
Members must immediately notify the Company upon becoming aware of any unauthorized use of their Account or any security breach.
Persons under the age of 14 may not register for the Service. Entities registering for business purposes must be duly incorporated legal entities or registered sole proprietors.

Article 6 (Member Obligations)

Members must comply with applicable laws and regulations, these Terms of Service, and the Company's usage policies, and must not engage in any conduct that interferes with the Company's operations.
Members are prohibited from engaging in the following acts:
- Forging or falsifying another person's receipt, or circumventing or abusing a payment system using the Service's API or SDK
- Reverse engineering, extracting source code, crawling, or engaging in unauthorized automated access to the Service (provided that publicly released open-source components are subject to their respective license terms)
- Generating excessive load on the Service's infrastructure or otherwise interfering with the normal operation of the Service
- Using the Service to distribute illegal software, malware, spam, or similar materials
- Infringing upon the personal information, intellectual property rights, or other rights of third parties
- Using end user data collected or processed through the Service in violation of applicable laws or app store policies
- Using the Service in connection with illegal gambling, fraud, money laundering, or other criminal activities
- Reselling, sublicensing, or leasing the Service to third parties without the Company's prior written consent
- Any other conduct contrary to public order and morality or applicable laws
When processing personal data of their app's end users through the Service, Members are responsible for complying with the personal data protection laws applicable in the relevant jurisdictions (including the Personal Information Protection Act, GDPR, CCPA, etc.). The Company does not fulfill legal obligations on behalf of Members in their capacity as data controllers or businesses.
If a Member violates this Article and causes damage to the Company, the Member shall be liable to compensate the Company for such damage.

Article 7 (Service Fees and Payment)

Free Plan: Members whose monthly MTR is $2,500 USD or below may use all features of the Service at no charge.
Pro Plan: Members whose monthly MTR exceeds $2,500 USD will be charged a service fee equal to 1% of the total MTR for that month. Pro Plan fees are calculated as of the last day of each month and are automatically billed through Paddle at the beginning of the following month. Example: If the monthly MTR is $10,000 USD, the service fee is $100 USD.
Details regarding MTR calculation criteria, exchange rate methodology, and calculation periods shall be separately communicated by the Company through in-service documentation or announcements. The Company may modify the calculation methodology for reasonable cause, with 30 days' prior notice.
Payments are processed through Paddle. Paddle's terms of service and privacy policy govern all matters related to Paddle's payment processing, security, and data protection. The Company shall not be liable for errors or failures occurring during Paddle's payment processing.
The Company may modify its fee structure for reasonable cause, including service improvements, changes in market conditions, or fluctuations in operating costs. Fee changes shall be announced at least 30 days prior to the effective date, and Members who do not agree to the changes may discontinue use of the Service and withdraw their membership prior to the effective date.
Value Added Tax (VAT) or local taxes may be separately imposed on service fees, and such taxes shall be handled in accordance with Paddle's Merchant of Record arrangement.
Payment information (such as credit card numbers) is processed and stored within Paddle's secure systems and is not stored on the Company's servers.

Article 8 (Refunds)

As the Service constitutes digital content and services as defined under Article 17, Paragraph 2, Item 5 of the Act on the Consumer Protection in Electronic Commerce (South Korea), the right of withdrawal may be restricted once the Service has commenced or its use has been completed.
Members may request a refund within 7 days from the date of billing for Pro Plan fees. However, refunds may be restricted if the Service was materially used during such period (e.g., API calls or receipt verification processing occurred).
If a Member is unable to use the Service due to causes attributable to the Company (such as system failures or service malfunctions), the Member may request a corresponding refund or credit, and the Company shall process such request within a reasonable scope.
Refund requests may be submitted by email to support@subx.dev. Following refund approval, the actual refund processing may take up to 10 business days depending on Paddle's processing timeline.
The Free Plan does not incur any fees and therefore is not subject to refunds.

Article 9 (Modification and Suspension of Service)

The Company may modify, add to, or remove all or part of the Service as operationally or technically necessary. For material changes, advance notice shall be provided via in-service announcements or email.
The Company may temporarily suspend the provision of the Service for the following reasons:
- Maintenance work including scheduled inspections, system upgrades, and security patches
- Force majeure events including war, natural disaster, power outage, or internet failure
- Suspension of integrations due to failures of third-party services (Apple, Google, Paddle, etc.)
- Other causes beyond the Company's reasonable control
In the event of a permanent discontinuation of the Service, the Company shall notify Members at least 30 days in advance via email and service announcements. Upon permanent discontinuation, the Company shall provide pro-rated refunds for any prepaid Pro Plan fees.
The Company's liability for damages suffered by Members due to temporary service interruptions shall be limited to the extent set forth in Article 12.

Article 10 (Intellectual Property Rights)

All intellectual property rights in and to the Service (including platform software, UI, design, documentation, trademarks, and logos) belong to the Company or the respective rightful owners. These Terms grant Members a limited, non-exclusive, non-transferable, non-sublicensable right to use the Service, and do not constitute a transfer of intellectual property rights.
Certain components of the Service may be made available under open-source licenses. The rights and obligations pertaining to open-source components shall be governed primarily by the applicable license (MIT, Apache 2.0, etc.).
Ownership of Content uploaded or created by Members in the Service (including Members' app data, subscription data, and configurations) remains with the Member. Members grant the Company a non-exclusive license to process, store, and transmit such Content to the extent necessary for the Company to provide the Service.
The Company shall not use Members' Content for purposes other than providing the Service, except where required by applicable law, pursuant to a lawful request from judicial authorities, or for investigation of a service security incident.
Members wishing to commercially use "Powered by SubX" or similar designations in connection with the Service must obtain the Company's prior written consent.

Article 11 (Data and Content)

Members bear legal responsibility for their app's end user data processed through the Service. Members must obtain lawful consent or establish a valid legal basis for the collection and processing of data from end users.
The Company may collect and analyze Members' service usage data (including API call logs, error logs, and aggregated statistics) for the purpose of providing the Service and technical support. Personal identifying information in this process shall be handled in accordance with the Privacy Policy.
The Company may use aggregated and anonymized statistical data from all Service users for the purposes of service improvement, research, and marketing. In such cases, measures shall be taken to ensure that individual Members or end users cannot be identified.
Members may export their data at any time through the features available within the Service. The data retention period and deletion procedures following account withdrawal are governed by the Privacy Policy.
If a Member registers unlawful Content in the Service (content that infringes upon the rights of others or violates applicable laws), the Company may delete such Content without prior notice or restrict the Member's access to the Service.

Article 12 (Limitation of Liability)

The Company shall not be liable for failure to provide the Service due to causes beyond the Company's reasonable control, including natural disasters, war, terrorism, widespread internet outages, or government orders to suspend service.
The Company shall not be liable for damages arising from the following:
- Matters relating to the accuracy, completeness, or reliability of Content posted or transmitted by Members through the Service
- Security breaches resulting from Members' negligence, such as API key leaks or theft of account credentials
- Policy changes, failures, or service interruptions of third-party services such as Apple, Google, or Paddle
- Disputes between Members' applications (provided through use of the Service) and end users
- Damages arising from unauthorized use of a Member's account by the Member or a third party
- Indirect damages, loss of anticipated profits, business losses, or data losses arising from use of the Service
The Company's total aggregate liability in connection with the Service shall not exceed the service fees actually received from the relevant Member during the month in which the cause of liability arose. This limitation shall not apply to damages caused by the Company's intentional misconduct or gross negligence.
The Service is provided "AS-IS," and the Company makes no express or implied warranties regarding the Service's fitness for a particular purpose, integrity, or continuous availability.
For consumer Members subject to applicable consumer protection laws, including the Framework Act on Consumers (South Korea), the standards prescribed under such laws shall take precedence over the disclaimers set forth in this Article.

Article 13 (Indemnification)

If a Member violates these Terms of Service or applicable laws and thereby causes damage to the Company, the Member shall be liable to fully compensate the Company for such damage.
If the Company receives any claims, lawsuits, or demands for damages from third parties (including Members' app end users) arising from a Member's use of the Service, the Member shall indemnify and hold the Company harmless, handle such claims on the Company's behalf, or compensate the Company for all costs incurred (including attorneys' fees).
Where the Company is liable to a Member for damages, the amount of such liability shall not exceed the limit set forth in Article 12, Paragraph 3, except in cases of the Company's intentional misconduct or gross negligence.

Article 14 (Termination and Withdrawal)

Members may request withdrawal at any time through the account settings menu within the Service, and the Company shall process the withdrawal immediately except as required by applicable law.
If there are any unpaid Pro Plan fees outstanding prior to the processing of withdrawal, such amounts shall be billed before the withdrawal is completed. Members must settle all outstanding fees prior to withdrawal.
Following the completion of withdrawal processing, the Member's account and associated data shall be deleted after the retention period prescribed under the Privacy Policy has elapsed. Information that must be retained for a certain period under applicable law shall be retained for the period prescribed under such law.
The Company may suspend a Member's access or terminate the agreement with or without prior notice in the following circumstances:
- The Member engages in conduct prohibited under Article 6
- The Member repeatedly fails to pay service fees or the Member's payment method becomes invalid
- It is confirmed that the Member registered using false information or by impersonating another person
- It is confirmed that the Member used or attempted to use the Service for illegal activities
- The Member otherwise materially violates these Terms
If the Company terminates the agreement pursuant to Paragraph 4, the Member must export their data stored in the Service prior to termination, and the Company may delete such data following termination.

Article 15 (Dispute Resolution)

These Terms of Service and any disputes arising from the use of the Service shall be governed by the laws of the Republic of Korea.
In the event of a dispute arising in connection with the use of the Service, the Company and the Member shall endeavor to resolve the dispute through mutual consultation as a first resort. If such consultation is unsuccessful, either party may utilize the Content Dispute Mediation Committee established under Article 29 of the Content Industry Promotion Act (South Korea), or other consumer dispute mediation procedures under applicable law.
Litigation concerning disputes shall be filed with the court of competent jurisdiction as prescribed under the Civil Procedure Act (South Korea). The court having jurisdiction over the location of the Company's principal place of business shall be designated as the court of agreed jurisdiction.

Supplementary Provisions

These Terms of Service shall take effect on February 18, 2026.
These Terms of Service shall also apply to Members who registered for the Service prior to the effective date of these Terms. However, legal relationships that arose prior to the effective date shall be governed by the previous terms.
Company email address: support@subx.dev
Company name: Plumbug Studio / Service domain: subx.dev