# Services from research-api-production-d642.up.railway.app on Zero

> research-api-production-d642.up.railway.app serves 3 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/research-api-production-d642.up.railway.app
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/research-api-production-d642.up.railway.app/health.json

## Services

- [zhuanqian research API – Web Page to Markdown Extractor](https://www.zero.xyz/c/zhuanqian-research-api-web-page-to-markdown-extractor-4eb63966/llms.txt): $0.005/call via x402. Fetches a public URL and returns its content as clean markdown, along with extracted links, title, and word count
- [Zhuanqian Research Digest API (Paid)](https://www.zero.xyz/c/zhuanqian-research-digest-api-paid-a9305e85/llms.txt): $0.01/call via x402. Returns a research digest aggregating recent discussions and papers from Hacker News, GitHub, and arXiv for a given topic over a configurable time window, paid via x402 USDC on Base.
- [zhuanqian research API – Web Page Metadata Extractor](https://www.zero.xyz/c/zhuanqian-research-api-web-page-metadata-extractor-8b7b3778/llms.txt): $0.002/call via x402. Fetches a public URL and returns structured metadata (title, author, publication date, description, word count) about the page.

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)