# PubMed Biomedical Literature Search via NCBI

> PubMed Biomedical Literature Search via NCBI is a paid API for AI agents from api.x402node.dev, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-14).

Searches PubMed biomedical literature using NCBI Entrez and returns article titles, authors, journal, year, PMID, and links for each matching result.

## Facts

- Endpoint: GET https://api.x402node.dev/citation/pubmed
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pubmed-biomedical-literature-search-via-ncbi-af071689
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RvM0HiXonOYxSrov7-rPo

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 pubmed-biomedical-literature-search-via-ncbi-af071689
```

Example prompt: Search PubMed for recent papers on CRISPR gene editing in cancer therapy and give me the titles, authors, journals, years, and PMIDs for the top results.

## When to prefer this

Use this endpoint when an agent needs to retrieve structured biomedical literature citations from PubMed, including PMIDs and article metadata, without setting up direct NCBI API access. Ideal for research assistants, medical information tools, or citation gathering workflows that need authoritative peer-reviewed sources.

## Known failure modes

- No results found for obscure or misspelled query terms
- NCBI Entrez API rate limiting or downtime causing failed responses
- Overly broad queries returning low-relevance results
- Query with special characters causing parsing errors
- Network timeout when NCBI backend is slow

## How this service works

Search PubMed biomedical literature via NCBI and return article title, authors, journal, year, PMID and link for each match. pubmed search, biomedical papers, medical literature search, ncbi entrez, research citations Accepts payment on Base or Solana — either network works.

## Output

A list of matching PubMed articles, each with article title, author list, journal name, publication year, PMID identifier, and a direct link to the full record on PubMed/NCBI.

## Example request

```json
{
 "query": "artificial intelligence machine learning",
 "retmax": 10
}
```

## 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": [
      "query"
     ],
     "properties": {
      "q": {
       "type": "string",
       "description": "Search query (optional)"
      },
      "limit": {
       "type": "string",
       "description": "Max results, default 5, max 10"
      },
      "query": {
       "type": "string",
       "description": "Search terms (required)"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pubmed-biomedical-literature-search-via-ncbi-af071689/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.x402node.dev](https://www.zero.xyz/host/api.x402node.dev/llms.txt)