# NCBI MedGen Concept Search via E-utilities

> NCBI MedGen Concept Search via E-utilities is a paid API for AI agents from clonecho.builda.company, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Searches NCBI MedGen medical genetics database and returns matching concept UIDs for a given query string.

## Facts

- Endpoint: POST https://clonecho.builda.company/x402/s/ncbi-esearch-medgen
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ncbi-medgen-concept-search-via-e-utilities-e9b1ff6d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9lHdSNLr3UzhspgUetMIG

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-medgen-concept-search-via-e-utilities-e9b1ff6d -d '<json body>'
```

Example prompt: Search NCBI MedGen for 'Marfan syndrome' and give me the matching concept UIDs.

## When to prefer this

Use this endpoint when you need to resolve a medical genetics term, disease name, or phenotype into NCBI MedGen concept UIDs, particularly as a first step before fetching detailed records from MedGen. Prefer this over general PubMed or gene searches when the target is specifically genetic disease concepts or clinical phenotypes catalogued in MedGen.

## Known failure modes

- Empty result set if the query term matches no MedGen concepts
- Malformed or overly broad query returning too many results
- NCBI E-utilities rate limiting or temporary unavailability causing errors
- Missing or empty 'q' parameter resulting in an error or empty response

## How this service works

Search NCBI MedGen medical genetics concepts and return matching UIDs for query {q} via E-utilities. Query: ?q= Returns JSON.

## Output

A JSON response containing MedGen concept UIDs (numeric identifiers) matching the search query, as returned by the NCBI E-utilities esearch endpoint scoped to the MedGen database.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ncbi-medgen-concept-search-via-e-utilities-e9b1ff6d/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)