# SiteCheck Web Intel – Europe PMC Literature Search

> SiteCheck Web Intel – Europe PMC Literature 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 2026-10-26).

Searches Europe PMC for life-science articles and returns metadata (PMID, title, authors, journal, year, DOI, cited-by count, link) without abstracts.

## Facts

- Endpoint: GET https://api.webintel-api.workers.dev/api/search/europe-pmc-articles?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-26
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-web-intel-europe-pmc-literature-search-3676b2e4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QOMf01tilcosWFS0SVlWR

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-europe-pmc-literature-search-3676b2e4
```

Example prompt: Search Europe PMC for up to 10 articles about CRISPR gene editing in cancer therapy and give me the title, authors, journal, year, DOI, and citation count for each.

## When to prefer this

Choose this endpoint when you need bibliographic metadata (title, authors, journal, year, DOI, citation count) for life-science papers including preprints from Europe PMC, and do not require full abstracts or full text. Prefer this over PubMed PMID lookup when you need keyword or query-based discovery rather than a single known PMID; prefer it over general web search when you need structured, citable academic metadata in a biomedical context.

## Known failure modes

- Query string missing or empty — returns error requiring the 'q' parameter
- Query exceeds 200 characters — rejected with validation error
- Limit outside 1–25 range — may return default count or error
- No matching articles found — returns empty results list
- Europe PMC upstream API unavailable — returns gateway or timeout error
- Malformed query syntax — may return zero results or unexpected matches

## How this service works

Europe PMC literature search (public REST API, no key): PMID or source id, title, authors, journal, year, DOI, cited-by count and Europe PMC link. Covers life-science papers including preprints; abstracts are not included.

## Output

Returns a list of up to 25 life-science articles from Europe PMC, each including PMID or source ID, title, authors, journal name, publication year, DOI, cited-by count, and a direct Europe PMC link. Abstracts are not included.

## 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 or Europe PMC query syntax (1 to 200 characters)"
      },
      "limit": {
       "type": "string",
       "description": "How many articles, 1 to 25 (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-europe-pmc-literature-search-3676b2e4/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)