# Saylor Innovations Europe PMC Biomedical Literature Search

> Saylor Innovations Europe PMC Biomedical Literature Search is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-18).

Searches Europe PMC biomedical literature and returns structured metadata including title, authors, journal, year, citation count, open access flag, PMID, PMCID, DOI, MeSH terms, and abstract

## Facts

- Endpoint: GET https://saylorinnovations.com/api/papers/europepmc?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-europe-pmc-biomedical-literature-search-2a32338c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Ec2T5r4CghM1EapkVSOy2

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 saylor-innovations-europe-pmc-biomedical-literature-search-2a32338c
```

Example prompt: Search Europe PMC for papers on 'long COVID AND treatment', sorted by citation count, and give me the titles, journals, DOIs, and abstracts.

## When to prefer this

Choose this endpoint when you need structured biomedical literature metadata from Europe PMC, especially when you require MeSH terms, open access flags, PMID/PMCID/DOI identifiers, citation counts, and abstracts in a single call. Prefer it over general web search when the user needs peer-reviewed scientific sources with structured bibliographic fields. It supports Europe PMC's native query syntax for precise Boolean and field-level searches.

## Known failure modes

- Missing required query parameter 'q' returns an error
- Invalid Europe PMC query syntax may return zero results or an error
- Network timeout if Europe PMC upstream is slow
- Very broad queries may return large result sets with partial data
- Rare articles may lack PMCID, DOI, or MeSH terms in the response

## How this service works

Search Europe PMC biomedical literature - title, authors, journal, year, citation count, open access flag, PMID, PMCID, DOI, MeSH terms and abstract

## Output

Returns a JSON object containing the interpreted query, sort order applied, data source, total match count, number of returned items, and an array of article objects each with title, authors, journal, publication year, citation count, open access status, PMID, PMCID, DOI, MeSH terms, and abstract.

## 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 query (supports Europe PMC syntax), e.g. crispr, \"long covid\" AND treatment"
      },
      "sort": {
       "type": "string",
       "description": "optional cited (default), date or relevance"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "query",
      "articles"
     ],
     "properties": {
      "sort": {
       "type": "string",
       "description": "Sort order applied"
      },
      "query": {
       "type": "string",
       "description": "The query as the server interpreted it"
      },
      "source": {
       "type": "string",
       "description": "Data source the values come from"
      },
      "articles": {
       "type": "array"
      },
      "returned": {
       "type": "number",
       "description": "Number of items in this response"
      },
      "total_matches": {
       "type": [
        "number",
        "null"
       ],
       "description": "Total number of matches before any limit is applied"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-europe-pmc-biomedical-literature-search-2a32338c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)