# PubMed Search via NCBI E-utilities (Custom Format)

> PubMed Search via NCBI E-utilities (Custom Format) 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, returning article count, PubMed ID list, and optional metadata (title, journal, pubdate) in a custom concierge format.

## Facts

- Endpoint: POST https://x402-v2-mint-pubmed-search.vercel.app/v1/pubmed-search/fmt/custom?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-custom-format-eeeadd14
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qsZFCn39FcHEL05qQ50XL

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-custom-format-eeeadd14 -d '<json body>'
```

Example prompt: Search PubMed for up to 10 recent articles on CRISPR gene editing and give me the titles, journals, and publication dates.

## When to prefer this

Choose this endpoint when you need to search biomedical or clinical literature from PubMed without managing an NCBI API key, and want structured metadata (title, journal, date) alongside IDs in a concierge custom format. Prefer it over raw NCBI E-utilities calls for agent workflows that need ready-to-use structured data with minimal setup. Use when up to 10 results per query is sufficient.

## Known failure modes

- Malformed or overly complex PubMed query syntax returns zero results or an error
- NCBI E-utilities rate limiting or downtime causes request failure
- retmax exceeding 10 is not supported and may be clamped or rejected
- Very broad queries may return high counts but limited metadata detail
- Network timeout if NCBI servers are slow to respond

## How this service works

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

## Output

Returns a structured custom-format response containing: total article count matching the query, a list of up to 10 PubMed IDs, and optional metadata per article including title, journal name, and publication date.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pubmed-search-via-ncbi-e-utilities-custom-format-eeeadd14/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)