# CrossRef Scholarly Works Search via clonecho.builda.company

> CrossRef Scholarly Works Search via clonecho.builda.company is a paid API for AI agents from clonecho.builda.company, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Searches 150M+ scholarly works (papers, articles, books) via CrossRef, returning title, authors, DOI, and citation metadata by keyword query.

## Facts

- Endpoint: POST https://clonecho.builda.company/x402/research-papers
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/crossref-scholarly-works-search-via-clonecho-builda-company-20f68326
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XaD-oprg_eE0fATCZIJQv

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

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability crossref-scholarly-works-search-via-clonecho-builda-company-20f68326 -d '<json body>'
```

Example prompt: Can you search for scholarly papers about CRISPR gene editing and give me the titles, authors, DOIs, and citation counts for the top results?

## When to prefer this

Use this endpoint when you need to search peer-reviewed academic or scientific literature at scale (150M+ works) and need structured metadata including DOIs and citation counts. Prefer it over general web search when the user explicitly wants scholarly sources, academic citations, or research papers indexed through CrossRef.

## Known failure modes

- Empty query string returns no results or an error
- Very broad queries may return too many loosely relevant results
- Highly specialized or very new papers may not yet be indexed in CrossRef
- Query with special characters may need URL encoding
- Rate limiting or payment failure may result in a 402 response

## How this service works

SCIENCE: search 150M+ scholarly works via CrossRef (title, authors, DOI, citations). ?q. Returns JSON.

## Output

A JSON array of scholarly works matching the query, each containing metadata such as title, author list, DOI, publication date, journal/source, and citation count as indexed by CrossRef.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/crossref-scholarly-works-search-via-clonecho-builda-company-20f68326/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from clonecho.builda.company](https://www.zero.xyz/host/clonecho.builda.company/llms.txt)