# SiteCheck Web Intel – Crossref Scholarly Search

> SiteCheck Web Intel – Crossref Scholarly Search is a paid API for AI agents from api.webintel-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-24).

Searches Crossref's public REST API for scholarly records, returning DOI, title, type, container, year, authors, and link for matching works.

## Facts

- Endpoint: GET https://api.webintel-api.workers.dev/api/search/crossref?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-24
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-web-intel-crossref-scholarly-search-44978a10
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XaS0VmRcQ_ep9e3E-FIoV

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 sitecheck-web-intel-crossref-scholarly-search-44978a10
```

Example prompt: Search Crossref for scholarly articles about CRISPR gene editing and return the top 5 results with their DOIs, authors, journals, and publication years.

## When to prefer this

Use this endpoint when you need bibliographic metadata (DOI, authors, journal, year) for scholarly literature from a broad, cross-publisher index. Prefer it over Google Scholar scraping for structured, machine-readable citation data. Ideal when you need DOIs for citation verification, reference generation, or academic research discovery without requiring full-text or abstracts.

## Known failure modes

- Empty results if the search query matches no Crossref records
- Rate limiting from the upstream Crossref public API during high-traffic periods
- Incomplete metadata if a record in Crossref lacks fields like year or authors
- Query too short or too long (must be 1–200 characters) returns a validation error
- rows parameter out of range (must be 1–20) may cause an error or be clamped

## How this service works

Crossref works search (public REST API, no key): DOI, title, type, container (journal or book), year, authors and link for matching scholarly records. Metadata only; abstracts are not always present in Crossref.

## Output

A list of matching scholarly records from Crossref, each containing: DOI, title, publication type (e.g. journal-article, book), container name (journal or book series), publication year, list of authors, and a direct link to the work. Abstracts are not guaranteed to be present.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "q"
     ],
     "properties": {
      "q": {
       "type": "string",
       "description": "Search words (1 to 200 characters)"
      },
      "rows": {
       "type": "string",
       "description": "How many records, 1 to 20 (default 5)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitecheck-web-intel-crossref-scholarly-search-44978a10/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.webintel-api.workers.dev](https://www.zero.xyz/host/api.webintel-api.workers.dev/llms.txt)