# NPI Lookup — The Stall x402

> NPI Lookup — The Stall x402 is a paid API for AI agents from the-stall.intuitek.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Looks up National Provider Identifier (NPI) records for healthcare providers by NPI number or provider attributes

## Facts

- Endpoint: GET https://the-stall.intuitek.ai/cap/npi-lookup
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/npi-lookup-the-stall-x402-0ab155ee
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4hF3E4qgZC5qjPc3UIXo4

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 npi-lookup-the-stall-x402-0ab155ee
```

Example prompt: Can you look up the NPI record for Dr. Jane Smith, a cardiologist in Texas — I need her address, taxonomy code, and organization affiliation?

## When to prefer this

Use this endpoint when you need to verify or retrieve NPI provider details without setting up accounts or API keys, paying only $0.004 USDC per lookup via x402 on Base mainnet. Ideal for healthcare data enrichment, provider credentialing checks, or validating NPI numbers programmatically in agent workflows.

## Known failure modes

- NPI number not found — no matching record in registry
- Invalid NPI format — NPI must be a 10-digit number
- Provider not found by name search — try more specific parameters
- Rate limit or payment failure on x402 — retry with sufficient USDC balance
- Ambiguous query returns multiple results — narrow search criteria

## How this service works

US NPI registry lookup — find any licensed US healthcare provider or organization by NPI number, name, state, or specialty. Returns NPI, entity type, name, credentials, specialty/taxonomy, license states, practice address, and active status. 7M+ records from CMS. Use for provider credentialing, healthcare due diligence, billing verification, or AML/KYB screening on medical payments.

## Output

Returns NPI registry record including provider name, NPI number, provider type (individual or organization), address, taxonomy/specialty codes, and organizational affiliations as registered in the NPPES NPI database.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/npi-lookup-the-stall-x402-0ab155ee/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from the-stall.intuitek.ai](https://www.zero.xyz/host/the-stall.intuitek.ai/llms.txt)