# Monarch Biomedical Entity Association Lookup

> Monarch Biomedical Entity Association Lookup 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).

Returns biomedical associations (gene, phenotype, and disease links) for a given Monarch Initiative entity ID.

## Facts

- Endpoint: POST https://clonecho.builda.company/x402/s/monarch-associations
- 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/monarch-biomedical-entity-association-lookup-e8f8f6f9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ESe6YjGz98OBbFn5kWXxh

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 monarch-biomedical-entity-association-lookup-e8f8f6f9 -d '<json body>'
```

Example prompt: Can you pull up all the biomedical associations — diseases, phenotypes, and gene links — for Monarch entity ID MONDO:0007947?

## When to prefer this

Use this endpoint when you need to retrieve structured biomedical association data (gene, phenotype, disease links) from the Monarch Initiative knowledge graph for a known Monarch entity ID. Prefer this over general biomedical search APIs when you have a specific Monarch-compatible identifier and need structured relationship data rather than free-text results.

## Known failure modes

- Invalid or unknown Monarch entity ID returns empty results or error
- Malformed query parameter returns HTTP 400
- Network timeout if Monarch upstream is slow
- Entity ID from wrong ontology namespace not recognized

## How this service works

List biomedical associations (gene, phenotype, disease links) for a Monarch entity id {q}. Query: ?q= Returns JSON.

## Output

A JSON object containing a list of biomedical associations for the queried Monarch entity, including linked genes, phenotypes, and diseases with relationship metadata such as association type, evidence, and related entity identifiers.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/monarch-biomedical-entity-association-lookup-e8f8f6f9/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)