# RxNav ATC Drug Class Lookup

> RxNav ATC Drug Class 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 a list of RxClass drug classes from the NLM RxNav API filtered by a given class type (e.g. ATC1-4, MOA, EPC).

## Facts

- Endpoint: POST https://clonecho.builda.company/x402/s/rxnav-atc-classes
- 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/rxnav-atc-drug-class-lookup-40ca09a8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nn2FH7yyc5TWnOw24JGuZ

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 rxnav-atc-drug-class-lookup-40ca09a8 -d '<json body>'
```

Example prompt: Can you pull all the Mechanism of Action (MOA) drug classes from the NLM RxClass database — I need the full list to categorize medications in my formulary tool.

## When to prefer this

Use this endpoint when you need a structured list of drug classes from the authoritative NLM RxNav/RxClass system, filtered by a specific classification scheme such as ATC (levels 1–4), Mechanism of Action (MOA), or Established Pharmacological Class (EPC). Prefer this over scraping NLM directly or using drug databases that don't expose class taxonomy.

## Known failure modes

- Missing or invalid q parameter returns empty or error response
- Unsupported class type string yields no results
- NLM RxNav upstream API unavailable causes failure
- Payment not processed results in 402 error

## How this service works

List RxClass drug classes of the given class type {q} (e.g. ATC1-4, MOA, EPC) from the NLM RxNav API. Query: ?q= Returns JSON.

## Output

A JSON array of RxClass drug class records matching the requested class type, including class names and identifiers sourced from the NLM RxNav API.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/rxnav-atc-drug-class-lookup-40ca09a8/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)