Terms of Service

1. Acceptance of Terms

By accessing or using BaZi API (accessible via baziapi.pro and api.baziapi.pro), registering an account, generating an API key, or using our REST endpoints, you agree to comply with and be bound by these Terms of Service.

If you represent an organization or company, you certify that you have the legal authority to bind that entity to these Terms. If you disagree with any part of these Terms, you must immediately terminate use of our services.

2. Description of the Service

BaZi API is a developer-focused SaaS/API service that provides Traditional Chinese BaZi / Four Pillars calculation functionality and structured machine-readable responses for software applications and automated workflows. Technical capabilities provided by the service include:

• Four Pillars calculations: Computes Year, Month, Day, and Hour pillars from Gregorian birth date and time input.
• Chinese calendar calculations: Converts Solar dates to Lunar calendar dates and Sexagenary cycle (Gan-Zhi) timestamps.
• True Solar Time: Provides True Solar Time (真太阳时) astronomical adjustments based on geographical coordinates and timezones.
• Five Elements (Wu Xing): Calculates element distributions, percentages, and polarities (Wood, Fire, Earth, Metal, Water).
• Ten Gods (Shi Shen): Derives natal chart relationships relative to the Day Master.
• Hidden Stems (Cang Gan): Extracts Earthly Branch hidden Heavenly Stems.
• Na Yin: Evaluates traditional melodic element classifications for all four pillars.
• Luck Pillars (Da Yun): Calculates decennial luck pillar cycles, starting dates, and transitional ages.
• API Authentication & API Keys: Manages cryptographically hashed API keys for client identification and access control.
• Rate Limiting & Quota Enforcement: Protects infrastructure with tier-based sliding-window rate limits.
• Outbound Webhooks: Dispatches real-time HMAC-SHA256 signed event webhooks for calendar shifts and quota alerts.
• Structured JSON: Delivers strictly typed, deterministic JSON payloads ready for OpenAI, LangChain, n8n, Zapier, mobile, and web applications.

3. Billing & Payment Processing

BaZi API offers Free, monthly, and yearly subscription plans for access to its developer API services.

We provide monthly and yearly recurring subscription plans: Free ($0), Basic ($19/mo or $180/yr), Pro ($49/mo or $468/yr), and Premium ($149/mo or $1,428/yr).

Paid plans renew automatically on the billing anniversary unless canceled prior to the renewal date. You may cancel your subscription at any time with zero penalty through your user dashboard or through the billing management mechanism provided with your subscription.

4. API Keys, Quotas & Rate Limits

API access is authenticated via cryptographic headers (x-api-key: bazi_*). You are solely responsible for keeping your keys private and secure:

• Free Plan: 1,000 requests/month, 30 RPM, 1 API Key (30-day validity).
• Basic Plan: 50,000 requests/month, 300 RPM, 3 API Keys (Permanent).
• Pro Plan: 250,000 requests/month, 500 RPM, 10 API Keys (Permanent).
• Premium Plan: 1,000,000 requests/month, 1,000 RPM, 30 API Keys (Permanent).

Exceeding rate limits will result in an HTTP 429 Too Many Requests status code. You may not attempt to circumvent rate limits by creating duplicate accounts or rotating compromised keys.

5. Cancellation & Refund Terms

We offer a transparent 7-day money-back guarantee on first-time subscription purchases if you experience unresolvable technical issues and have consumed less than 15% of your plan's monthly request quota.

For comprehensive criteria and step-by-step refund submission instructions, please review our dedicated Refund & Cancellation Policy.

6. Acceptable Use Policy

You agree NOT to:

• Resell, sublicense, or redistribute raw API responses as a competing standalone BaZi API service.
• Engage in denial-of-service (DoS) attacks, stress tests, or unauthorized penetration testing.
• Use the API to facilitate unlawful harassment, discrimination, or deceptive consumer practices.
• Attempt to reverse-engineer, scrape, or extract proprietary calculation algorithms from API responses.

7. Intellectual Property

BaZi API and all associated software, documentation, and content are the property of the service operator. The API returns calculation results based on traditional Chinese calendar algorithms; the underlying calculation engine and software implementation remain proprietary.

You retain full ownership of applications you build using BaZi API output data.

8. Limitation of Liability

To the maximum extent permitted by applicable law, BaZi API and its operators shall not be liable for any indirect, incidental, punitive, or consequential damages resulting from downtime, calculation inaccuracies, data loss, or decisions made based upon calculation outputs. The total cumulative liability of BaZi API to you shall not exceed the amount paid by you in the three months preceding the claim.

9. Changes to Service

We reserve the right to modify, suspend, or discontinue any part of the service with reasonable notice. Material changes to these Terms will be communicated via email or a notice on the website. Continued use of the service after changes constitutes acceptance of the revised Terms.

10. Governing Law & Dispute Resolution

These Terms of Service and any non-contractual obligations arising out of or in connection with them shall be governed by and construed in accordance with applicable governing laws. Any dispute, controversy, or claim arising out of or relating to these Terms, or the breach, termination, or invalidity thereof, shall be resolved through good-faith mutual negotiations. If unresolved, disputes shall be submitted to the competent courts having jurisdiction over the registered business entity operating the service.