> For the complete documentation index, see [llms.txt](https://doc.duaer.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.duaer.com/getting-started/monarch.md).

# Search Monarch in Duaer

In Duaer, search Monarch diseases, phenotypes, or genes with Duaer Data. One successful search uses 1 credit. This page includes the full English call skill.
## What you get

Monarch in the Duaer data market returns MONDO, HPO, or gene entries with cross-references. One successful search uses 1 credit.

Add the node from the [Duaer Data category](/getting-started/duaer-data.md) (Monarch), or copy the skill on the [data market](/getting-started/data-market.md). Related: [Phenotypes](/getting-started/phenotypes.md).

## Search on the canvas

1. Open the node creator, select Duaer Data, then Monarch.
2. Enter Words (a new node starts with Marfan), or a Monarch id. Category defaults to Disease.
3. Limit defaults to 10, max 20. Select Execute step.

A successful search uses 1 credit. Production deliverables land in the [data pool](/getting-started/data-pool.md).

## Call the API

- GET https://api.duaer.com/v1/data/monarch?...
- Authorization: Bearer <Duaer key>
- words or id is required.

For keys, refer to [Authentication for the Duaer public API](/api/authentication.md). Below is the same English call skill as Copy skill.

## Call skill

Same text as Copy skill on the Duaer data market. Keep it English.

```
---
name: duaer-monarch
description: >-
  Search Monarch diseases, phenotypes, or genes through Duaer.
  One successful search uses 1 Duaer credit.
---

# Duaer Monarch

Search Monarch diseases, phenotypes, or genes through Duaer with a Duaer key.

## Call

`GET https://api.duaer.com/v1/data/monarch?words=Marfan&category=disease&limit=10`

Header: `Authorization: Bearer <Duaer key>`

Use an account key or a model API key.

Provide `words` or `id`.

- `words` — search text, such as Marfan.
- `id` — optional. CURIE such as MONDO:0007947, HP:0000819, or HGNC:1100.
- `category` — optional. disease (default), phenotype, or gene. Used with words.
- `limit` — optional. From 1 to 20. Default 10.

## Result

Each item has `source`, `title`, `url`, `summary`, `monarchId`, `name`, `category`, `description`, `taxon`, and `xrefs`.
Related diseases: https://skills.duaer.com/diseases.md.
Related phenotypes: https://skills.duaer.com/phenotypes.md.

## Credits

One successful search uses 1 credit.
An empty search, a failed search, a compound that matches nothing, or no remaining credits uses 0.
No remaining credits returns 402 and does not search.
A missing key returns 401.

```
## Questions

### How do Duaer Monarch, Diseases, and Phenotypes differ?

Diseases uses UniProt disease. Phenotypes uses HPO. Monarch searches disease, phenotype, or gene together and returns cross-references.

## Related

- [Search diseases in Duaer](https://doc.duaer.com/getting-started/diseases.md)
- [Search phenotypes in Duaer](https://doc.duaer.com/getting-started/phenotypes.md)
- [Search genes in Duaer](https://doc.duaer.com/getting-started/genes.md)
- [Use the Duaer data market](https://doc.duaer.com/getting-started/data-market.md)