# FDA National Drug Code (NDC) Directory Lookup

> FDA National Drug Code (NDC) Directory Lookup is a paid API for AI agents from clonecho.builda.company, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Searches the FDA National Drug Code directory for marketed drug products, returning ingredients, dosage form, and product details by drug name.

## Facts

- Endpoint: POST https://clonecho.builda.company/x402/drug-ndc
- 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/fda-national-drug-code-ndc-directory-lookup-add6f5a2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zhNiMgmf9TECpRodZPqcJ

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 fda-national-drug-code-ndc-directory-lookup-add6f5a2 -d '<json body>'
```

Example prompt: Can you look up the FDA National Drug Code directory entry for metformin — I need the ingredients, dosage form, and marketing status?

## When to prefer this

Use this endpoint when you need authoritative FDA-sourced drug product information including NDC codes, ingredients, and dosage forms for marketed pharmaceutical products. Prefer this over general web search when regulatory accuracy and structured JSON output are required for healthcare, compliance, or pharmaceutical applications.

## Known failure modes

- Drug name not found in FDA NDC directory — returns empty results
- Ambiguous drug name matching multiple products — returns multiple entries requiring filtering
- FDA NDC directory data may not include all drugs (e.g., unapproved or compounded drugs)
- Payment failure — x402 payment of $0.02 USDC not processed, request rejected
- Missing or malformed query parameter — API returns error

## How this service works

HEALTH: FDA National Drug Code directory — marketed products, ingredients, dosage form. ?q=drug name. Returns JSON.

## Output

A JSON object containing FDA NDC directory data for matching drug products, including NDC codes, product names, active ingredients, dosage forms, routes of administration, marketing status, and labeler/manufacturer details.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fda-national-drug-code-ndc-directory-lookup-add6f5a2/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)