Look up US healthcare providers in the CMS NPPES registry — the authoritative directory of National Provider Identifiers (NPIs). Give an exact 10-digit NPI, or search by provider last name (+ optional first name), or organization name, optionally narrowed by state and taxonomy/specialty. Returns each provider with NPI, entity type (individual vs organization), status, name/credential/gender or organization name, sole-proprietor flag, enumeration + last-updated dates, primary taxonomy, the full taxonomy list (code, description, primary flag, state license), and practice/mailing addresses with phone. Free, public-domain (CMS). The canonical "who is this NPI / find this provider" lookup for healthcare, claims, and credentialing agents.
/api/medical/npiPAYMENT-SIGNATURE.The npi API is a pay-per-call medical endpoint built for AI agents and autonomous software. Look up US healthcare providers in the CMS NPPES registry — the authoritative directory of National Provider Identifiers (NPIs).
There is no signup and no API key. An agent (or any HTTP client) hits the endpoint, receives an x402 "402 Payment Required" challenge, signs a sub-cent USDC payment on Base or Solana, and retries — the data comes back on the paid request. That makes it a drop-in npi data source for an agent tool-use loop, an MCP host, or a backend that needs medical data on demand without onboarding to yet another vendor portal.
| Name | Type | Description |
|---|---|---|
npi | string | match ^\d{10}$ |
firstName | string | min 1 chars · max 60 chars |
lastName | string | min 1 chars · max 60 chars |
organization | string | min 2 chars · max 120 chars |
state | string | min 2 chars · max 2 chars |
taxonomy | string | min 2 chars · max 80 chars |
limit | integer | min 1 · max 50 |
# 1. Probe with no auth → 402 envelope with PaymentRequirements curl -sS 'https://2s.io/api/medical/npi?npi=12345&firstName=example&lastName=example&organization=xx&state=xx&taxonomy=xx&limit=1' # 2. Sign + retry with PAYMENT-SIGNATURE: curl -sS 'https://2s.io/api/medical/npi?npi=12345&firstName=example&lastName=example&organization=xx&state=xx&taxonomy=xx&limit=1' \ -H 'PAYMENT-SIGNATURE: <base64-json-payload>' # Or use the canonical runner (handles probe → sign → retry): # EVM_PRIVATE_KEY=0x... node --env-file=.env.local \ # --experimental-strip-types scripts/x402-pay.ts \ # 'https://2s.io/api/medical/npi?npi=12345&firstName=example&lastName=example&organization=xx&state=xx&taxonomy=xx&limit=1'
import { TwoS } from '@2sio/sdk'
const client = new TwoS({
privateKey: process.env.EVM_PRIVATE_KEY as `0x${string}`,
})
const result = await client.medical.npi({
"npi": "12345",
"firstName": "example",
"lastName": "example",
"organization": "xx",
"state": "xx",
"taxonomy": "xx",
"limit": 1
})
console.log('endpoint:', result.endpoint)
console.log('cost:', result.costUsd, 'USDC')
console.log('tx:', result.settlement?.txHash)
console.log('data:', result.data)import os
from twosio import TwoS
client = TwoS(private_key=os.environ["EVM_PRIVATE_KEY"])
result = client.medical.npi(npi="12345", firstName="example", lastName="example", organization="xx", state="xx", taxonomy="xx", limit=1)
print("endpoint:", result.endpoint)
print("cost:", result.cost_usd, "USDC")
print("tx:", (result.settlement or {}).get("tx_hash"))
print("data:", result.data)// 1. Add @2sio/mcp to your MCP host config (Claude Desktop example below).
// EVM_PRIVATE_KEY funds x402 payments per call.
// claude_desktop_config.json
{
"mcpServers": {
"2sio": {
"command": "npx",
"args": ["-y", "@2sio/mcp"],
"env": { "EVM_PRIVATE_KEY": "0x..." }
}
}
}
// 2. Once the server is running, agents call this tool via standard MCP:
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/call",
"params": {
"name": "medical.npi",
"arguments": {
"npi": "12345",
"firstName": "example",
"lastName": "example",
"organization": "xx",
"state": "xx",
"taxonomy": "xx",
"limit": 1
}
}
}| Field | Type | Description |
|---|---|---|
ok | boolean | one of: true |
items | array | |
total | integer | Total matching rows upstream; null when unknown. |
source | object |
{
"ok": true,
"items": [
{
"npi": "example",
"enumerationType": "example",
"entityType": "Individual",
"status": "example",
"firstName": "example",
"lastName": "example",
"credential": "example",
"gender": "example",
"organizationName": "example",
"soleProprietor": "example",
"enumerationDate": "example",
"lastUpdated": "example",
"primaryTaxonomy": "example",
"taxonomies": [
{
"code": "example",
"description": "example",
"primary": false,
"state": "example",
"license": "example"
}
],
"addresses": [
{
"purpose": "example",
"address1": "example",
"address2": "example",
"city": "example",
"state": "example",
"postalCode": "example",
"countryCode": "example",
"telephone": "example",
"fax": "example"
}
]
}
],
"total": 1,
"source": {
"provider": "example",
"url": "example",
"license": "example"
}
}