# Services from research.memoryapi.org on Zero

> research.memoryapi.org serves 6 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.memoryapi.org
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/research.memoryapi.org/health.json

## Services

- [arXiv Preprint Search via research.memoryapi.org](https://www.zero.xyz/c/research-memoryapi-org-fcd1d1fa/llms.txt): $0.005/call via x402. Search arXiv preprints across CS, AI, physics, math, and other scientific disciplines by keyword or topic.
- [OpenAlex Researcher & Scientist Profile Lookup](https://www.zero.xyz/c/research-memoryapi-org-6211942a/llms.txt): $0.005/call via x402. Look up researcher and scientist profiles from OpenAlex, filterable by name and institution.
- [OpenAlex Scholarly Works Search](https://www.zero.xyz/c/research-memoryapi-org-cbbe5abe/llms.txt): $0.005/call via x402. Search 250M+ scholarly works via OpenAlex, filtering by keyword, topic, year, and sorting by citations or recency.
- [PubMed Biomedical Literature Search](https://www.zero.xyz/c/research-memoryapi-org-1c96d267/llms.txt): $0.005/call via x402. Search NIH PubMed biomedical literature with filtering by query, result limit, and sort order
- [research.memoryapi.org – Paper Citations & Metadata via Crossref](https://www.zero.xyz/c/research-memoryapi-org-e839a253/llms.txt): $0.005/call via x402. Retrieve academic paper citations and metadata using Crossref, supporting both topic-based search and direct DOI lookup
- [Research Institution Profiles Lookup (OpenAlex + HipoLabs)](https://www.zero.xyz/c/research-memoryapi-org-8d99a98e/llms.txt): $0.005/call via x402. Look up research institution profiles by combining data from OpenAlex and HipoLabs, returning details about universities, labs, and research organizations.

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)