# PubMed Search via NCBI E-utilities (Markdown)

> PubMed Search via NCBI E-utilities (Markdown) is a paid API for AI agents from x402-v2-mint-pubmed-search.vercel.app, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-31).

Searches PubMed using NCBI E-utilities without an API key and returns results as markdown-formatted text including article count, ID list, and optional metadata like title, journal, and publication date.

## Facts

- Endpoint: POST https://x402-v2-mint-pubmed-search.vercel.app/v1/pubmed-search/fmt/markdown?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pubmed-search-via-ncbi-e-utilities-markdown-b7922fdc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5HxalaCnXPjXcBDbcYd6f

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-search-via-ncbi-e-utilities-markdown-b7922fdc -d '<json body>'
```

Example prompt: Search PubMed for up to 10 papers on CRISPR gene editing in cancer therapy and return the results as markdown with titles, journals, and publication dates.

## When to prefer this

Choose this endpoint when you need a quick, keyless PubMed literature search with human-readable markdown output — ideal for AI agents surfacing biomedical research results in chat interfaces, reports, or summaries. Prefer this over the JSON or CSV sibling endpoints when the output is going directly to a human reader or a markdown-rendering context. Best for exploratory queries returning up to 10 results; not suited for bulk retrieval or full-text access.

## Known failure modes

- Empty result set if query terms match no PubMed records
- NCBI rate limiting or temporary unavailability causing request failure
- Malformed or overly complex query syntax returning unexpected results
- retmax exceeding the cap of 10 being silently clamped or rejected
- Optional metadata fields absent when NCBI record is incomplete

## How this service works

[concierge markdown] PubMed search via NCBI E-utilities (keyless). Query → count + idlist (retmax≤10) + optional title/journal/pubdate.

## Output

A markdown-formatted response containing the total count of matching PubMed articles, a list of up to 10 PubMed IDs (PMIDs), and optionally for each result: the article title, journal name, and publication date.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pubmed-search-via-ncbi-e-utilities-markdown-b7922fdc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-v2-mint-pubmed-search.vercel.app](https://www.zero.xyz/host/x402-v2-mint-pubmed-search.vercel.app/llms.txt)