health.open-payments

Search CMS Open Payments — every payment from a drug/device manufacturer or GPO to a US physician or teaching hospital under the Sunshine Act (~10M records per year). Lookup by 10-digit NPI for the recipient (most precise), by last/first name + state, or by payer (manufacturer) name. Each record includes recipient (NPI, name, specialty, location), payer (manufacturer name + state/country), payment (amount USD, date, nature of payment such as 'Consulting Fee'/'Food and Beverage'/'Travel'/'Royalty', form of payment), and associated product (drug/device name + therapeutic area). Investigative journalism + KYC + healthcare conflict-of-interest research. Public-domain federal data.

price

$0.0012 USDC per call

method

GET/api/health/open-payments

payment

x402 v2 · USDC on Base (EIP-3009) or Solana (SPL transfer)

auth

None. Sign the payment, retry with PAYMENT-SIGNATURE.

tier

Tier 0 — no paid upstream

Parameters

Name	Type	Description
`npi`	string	match ^\d{10}$
`firstName`	string	min 1 chars · max 80 chars
`lastName`	string	min 1 chars · max 80 chars
`payerName`	string	min 2 chars · max 200 chars
`state`	string	min 2 chars · max 2 chars · match ^[A-Za-z]{2}$
`minAmount`	number	min 0 · max 10000000
`limit`	integer	min 1 · max 100
`offset`	integer	min 0 · max 100000

Code samples

cURLbash

# 1. Probe with no auth → 402 envelope with PaymentRequirements
curl -sS 'https://2s.io/api/health/open-payments?npi=12345&firstName=example&lastName=example&payerName=xx&state=xx&minAmount=0&limit=20&offset=0'

# 2. Sign + retry with PAYMENT-SIGNATURE:
curl -sS 'https://2s.io/api/health/open-payments?npi=12345&firstName=example&lastName=example&payerName=xx&state=xx&minAmount=0&limit=20&offset=0' \
  -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/health/open-payments?npi=12345&firstName=example&lastName=example&payerName=xx&state=xx&minAmount=0&limit=20&offset=0'

TypeScript / Node — @2sio/sdktypescript

import { TwoS } from '@2sio/sdk'

const client = new TwoS({
  privateKey: process.env.EVM_PRIVATE_KEY as `0x${string}`,
})

const result = await client.health.openPayments({
  "npi": "12345",
  "firstName": "example",
  "lastName": "example",
  "payerName": "xx",
  "state": "xx",
  "minAmount": 0,
  "limit": 20,
  "offset": 0
})

console.log('endpoint:', result.endpoint)
console.log('cost:', result.costUsd, 'USDC')
console.log('tx:', result.settlement?.txHash)
console.log('data:', result.data)

Python — 2siopython

import os
from twosio import TwoS

client = TwoS(private_key=os.environ["EVM_PRIVATE_KEY"])

result = client.health.open_payments(npi="12345", firstName="example", lastName="example", payerName="xx", state="xx", minAmount=0, limit=20, offset=0)

print("endpoint:", result.endpoint)
print("cost:", result.cost_usd, "USDC")
print("tx:", (result.settlement or {}).get("tx_hash"))
print("data:", result.data)

MCP — Claude Desktop / AgentKit / any MCP hostjson

// 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": "health.open-payments",
    "arguments": {
      "npi": "12345",
      "firstName": "example",
      "lastName": "example",
      "payerName": "xx",
      "state": "xx",
      "minAmount": 0,
      "limit": 20,
      "offset": 0
    }
  }
}

Response

Field	Type	Description
`query`	object
`totalCount`	integer
`returned`	integer
`payments`	array
`source`	object

Example response datajson

{
  "query": {
    "npi": "example",
    "lastName": "example",
    "firstName": "example",
    "payerName": "example",
    "state": "example",
    "minAmount": 1,
    "limit": 1,
    "offset": 1
  },
  "totalCount": 1,
  "returned": 1,
  "payments": [
    {
      "recordId": "example",
      "recipient": {
        "npi": "example",
        "firstName": "example",
        "lastName": "example",
        "type": "example",
        "primarySpecialty": "example",
        "city": "example",
        "state": "example"
      },
      "payer": {
        "name": "example",
        "state": "example",
        "country": "example"
      },
      "payment": {
        "amountUsd": 1,
        "date": "example",
        "natureOfPayment": "example",
        "formOfPayment": "example"
      },
      "associatedProduct": {
        "type": "example",
        "name": "example",
        "therapeuticArea": "example"
      },
      "programYear": "example"
    }
  ],
  "source": {
    "provider": "example",
    "url": "https://example.com",
    "license": "example",
    "programYear": "example"
  }
}

Discovery

/api/directory — full catalog of every endpoint
/openapi.json — OpenAPI 3.1 spec (per-op x-payment-info, x402Payment security)
/.well-known/x402 — machine-readable service descriptor for x402-aware crawlers
/.well-known/mcp/server-card.json — MCP SEP-1649 server card
/llms.txt — plain-text manifest for LLM ingestion

2s.io is x402-native. Every call is paid per-request from a USDC-funded EVM wallet on Base — no signup, no API keys, no monthly fees. Source code: github.com/2s-io/sdk.