US healthcare provider lookup in the CMS NPPES NPI Registry
US healthcare provider lookup in the CMS NPPES NPI Registry: by NPI number, or by name/organization, specialty (taxonomy), city, state or ZIP. Returns NPI, individual/organization, name, credential, status, primary and all taxonomies with state license numbers, practice address and phone. Not charged on errors.
Answeringour last check, 2026-10-31
1 of 1checks answered this week
332 msmedian answer time
$0.02listed price per call
$0.02price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://x402-domain-check.vercel.app/providers/npi
| Category | Company and compliance |
|---|---|
| Provider host | x402-domain-check.vercel.app |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-31 | valid payment request | 402 | $0.02 | 332 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"last_name": "smith",
"limit": 5,
"state": "CA",
"taxonomy": "Cardiovascular Disease"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"city": {
"type": "string"
},
"first_name": {
"type": "string"
},
"last_name": {
"type": "string"
},
"limit": {
"default": 10,
"maximum": 50,
"minimum": 1,
"type": "integer"
},
"npi": {
"description": "10-digit NPI",
"type": "string"
},
"organization": {
"description": "Organization name (trailing * wildcard allowed)",
"type": "string"
},
"postal_code": {
"type": "string"
},
"state": {
"description": "2-letter state",
"type": "string"
},
"taxonomy": {
"description": "NUCC taxonomy description, e.g. Cardiovascular Disease (trailing * wildcard ok, e.g. cardio*)",
"type": "string"
},
"type": {
"enum": [
"individual",
"organization"
],
"type": "string"
}
},
"required": [],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}