# NCBI PubMed E-Search via clonecho

> NCBI PubMed E-Search via clonecho is a paid API for AI agents from clonecho.builda.company, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Search PubMed for biomedical literature and return matching article UIDs using the NCBI E-utilities esearch endpoint

## Facts

- Endpoint: POST https://clonecho.builda.company/x402/s/ncbi-esearch-pubmed
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ncbi-pubmed-e-search-via-clonecho-738ac660
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SbaANxjKe04GH20pbeYF_

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 ncbi-pubmed-e-search-via-clonecho-738ac660 -d '<json body>'
```

Example prompt: Search PubMed for articles about CRISPR gene editing in cancer therapy and give me the matching article UIDs.

## When to prefer this

Use this endpoint when you need to programmatically search PubMed for biomedical literature and retrieve article UIDs (PMIDs) for a given keyword, author, MeSH term, or complex query string. It is ideal for research workflows where you need to identify relevant scientific papers before fetching full article details. Prefer this over general web search when precision against the NCBI PubMed database is required.

## Known failure modes

- Empty result set if query matches no articles — returns zero UIDs
- Query string with special characters may cause malformed request or unexpected results
- NCBI E-utilities rate limiting or downtime may cause 5xx errors
- Very broad queries may return thousands of UIDs, requiring pagination not supported by this endpoint
- Missing or empty q parameter may return an error or empty results

## How this service works

Search PubMed and return matching article UIDs for query {q} via NCBI E-utilities. Query: ?q= Returns JSON.

## Output

A JSON object containing a list of PubMed article UIDs (PMIDs) matching the search query, along with metadata such as result count and query translation from the NCBI E-utilities esearch response.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ncbi-pubmed-e-search-via-clonecho-738ac660/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from clonecho.builda.company](https://www.zero.xyz/host/clonecho.builda.company/llms.txt)