# Saylor Innovations Medical Reference — NPI Registry Lookup

> Saylor Innovations Medical Reference — NPI Registry Lookup is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-03).

Looks up U.S. healthcare providers by name or state using the National Provider Identifier (NPI) Registry

## Facts

- Endpoint: GET https://saylorinnovations.com/api/medical/npi?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-03
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-medical-reference-npi-registry-lookup-b3c474d9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rlp1Vz_1Ra_sIitO-yE7p

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 saylor-innovations-medical-reference-npi-registry-lookup-b3c474d9
```

Example prompt: Can you look up U.S. healthcare providers with the last name 'Johnson' in California using the NPI registry?

## When to prefer this

Use this endpoint when you need to search the U.S. NPI registry for healthcare provider records by last name and/or state. Ideal for verifying provider credentials, building provider directories, or enriching healthcare data with NPI registration details. Prefer this over direct NPI API access when you need a simple, pay-per-call interface without managing API credentials.

## Known failure modes

- No providers found matching the given last name or state — returns empty providers array with count 0
- Invalid or missing required query parameters may return an error or empty result
- State code must be a valid 2-letter US abbreviation; invalid values may yield no results
- Service unavailability or upstream NPI registry issues may cause timeout or 5xx errors

## How this service works

U.S. Healthcare Provider Lookup (NPI Registry). U.S. healthcare provider lookup in the CMS NPI Registry by NPI number, name, organization, state, city or specialty: credential, specialty, license, status, practice address and phone.

## Output

Returns a JSON object containing a count of matched providers and an array of provider records from the NPI registry, each including provider details such as name, specialty, and registration information.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "POST",
      "PUT",
      "PATCH",
      "DELETE",
      "HEAD"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "state": {
       "type": "string",
       "description": "optional 2-letter state (query)"
      },
      "last_name": {
       "type": "string",
       "description": "or provider last name (query)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "providers"
     ],
     "properties": {
      "count": {
       "type": "number"
      },
      "providers": {
       "type": "array",
       "items": {
        "type": "object"
       }
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-medical-reference-npi-registry-lookup-b3c474d9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)