# LaoZhang API

> LaoZhang API is a B2B AI API gateway and routing service for enterprise developers, product backends, internal tools, and automation systems.

LaoZhang API is operated by YingTu Technology Pte. Ltd. in Singapore. It provides unified technical access to third-party AI model APIs, request-level usage visibility, routing, billing, and integration support. It is not the official operator of the third-party models routed through the service and does not provide a public-facing consumer AI product.

By default, LaoZhang API does not store, view, analyze, cache, sell, or use API prompt or response content for model training or user profiling. It retains necessary account, billing, security, and service metadata for operation, billing, troubleshooting, rate limiting, and abuse prevention. API content is transmitted to the selected upstream model and infrastructure providers, which may apply their own logging, retention, abuse-monitoring, and data-processing terms.

Last updated: 2026-07-24.

## Official resources

- [Official website](https://www.laozhang.ai): Canonical product and company information.
- [API documentation](https://docs.laozhang.ai/en): Integration guides, supported interfaces, and current technical documentation.
- [Service status](https://api2.laozhang.ai/uptimeStatus): Current API service availability.
- [LaoZhang API Blog](https://blog.laozhang.ai): Technical guides and product updates.
- [Full product context](https://www.laozhang.ai/llms-full.txt): Detailed service scope, billing, and data-handling boundaries.

## Legal and data policies

- [Terms of Service](https://www.laozhang.ai/terms): Service scope, upstream-provider terms, billing, and customer responsibilities.
- [Privacy Policy](https://www.laozhang.ai/privacy): Account, website, billing, security, and support information practices.
- [Data Policy](https://www.laozhang.ai/data-policy): API-content, metadata, billing, account, and support-data boundaries.
- [Chinese Terms of Service](https://www.laozhang.ai/zh-cn/terms): Simplified Chinese legal terms.
- [Chinese Privacy Policy](https://www.laozhang.ai/zh-cn/privacy): Simplified Chinese privacy information.
- [Chinese Data Policy](https://www.laozhang.ai/zh-cn/data-policy): Simplified Chinese data-handling information.

## Optional

- [YingTu AI image tool](https://yingtu.ai): A separate AI image product operated under the broader YingTu product portfolio.