# PubMed / NCBI Biomedical Literature Metadata

> PubMed / NCBI Biomedical Literature Metadata is a paid API for AI agents from agentdatum.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Retrieves biomedical literature metadata from the PubMed/NCBI database without requiring registration or an API key.

## Facts

- Endpoint: GET https://agentdatum.com/api/v1/d/pubmed
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pubmed-ncbi-biomedical-literature-metadata-de19ebf1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0I2GHaDcD_wcenjm2ucBN

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-ncbi-biomedical-literature-metadata-de19ebf1
```

Example prompt: Can you pull up the PubMed metadata for recent studies on CRISPR gene editing therapies, including titles, authors, and abstracts?

## When to prefer this

Choose this endpoint when you need free, no-registration access to PubMed/NCBI biomedical literature metadata — ideal for retrieving article abstracts, author lists, and citation data for medical or life-science research tasks without needing an API key or institutional access.

## Known failure modes

- No results returned for overly specific or misspelled queries
- Rate limiting or throttling if too many requests are sent in a short period
- Incomplete metadata for older articles that lack structured records
- Query returning unrelated results due to ambiguous medical terminology
- Network timeout if NCBI upstream service is temporarily unavailable

## How this service works

ADH 金融情报层：把 239 个原始数据源洗成带实体解析、时间同步、溯源与派生结论的情报（宏观regime / 加密尽调 / 事件窗口），免费注入你的 AI 上下文。Agent 走 x402 结算，人类订阅（PayPal）即将上线。

## Output

Returns structured metadata for biomedical articles from the PubMed/NCBI database, including fields such as article title, authors, journal name, publication date, abstract text, PMID, and DOI where available.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "raw": {
   "header": {
    "type": "einfo",
    "version": "0.3"
   },
   "einforesult": {
    "dbinfo": [
     {
      "count": "40987414",
      "dbname": "pubmed",
      "dbbuild": "Build-2026.08.09.07.19",
      "linklist": [
       {
        "dbto": "assembly",
        "menu": "Assembly",
        "name": "pubmed_assembly",
        "description": "Assembly"
       },
       {
        "dbto": "assembly",
        "menu": "Assembly",
        "name": "pubmed_assembly",
        "description": "Assembly"
       }
      ],
      "menuname": "PubMed",
      "fieldlist": [
       {
        "name": "ALL",
        "isdate": "N",
        "fullname": "All Fields",
        "ishidden": "N",
        "hierarchy": "N",
        "termcount": "",
        "description": "All terms from all searchable fields",
        "isnumerical": "N",
        "singletoken": "N"
       },
       {
        "name": "ALL",
        "isdate": "N",
        "fullname": "All Fields",
        "ishidden": "N",
        "hierarchy": "N",
        "termcount": "",
        "description": "All terms from all searchable fields",
        "isnumerical": "N",
        "singletoken": "N"
       }
      ],
      "lastupdate": "2026/08/09 07:19",
      "description": "PubMed bibliographic record"
     }
    ]
   }
  },
  "source": "generic_json",
  "data_type": "学术文献",
  "collected_at": "2026-08-09T18:13:16Z"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pubmed-ncbi-biomedical-literature-metadata-de19ebf1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentdatum.com](https://www.zero.xyz/host/agentdatum.com/llms.txt)