Look up entities registered to do business with the US federal government in SAM.gov. Search by ueiSAM (12-char Unique Entity ID), cageCode, or legalBusinessName (provide at least one); page with limit (1-100). Returns each entity with its UEI, CAGE code, legal and DBA name, SAM registration status and dates (registration, expiration, last update), purpose of registration, an active-exclusion flag, physical address, and business types — plus a total match count. Data: SAM.gov entity management, free and public-domain (registration core data; sensitive FOUO sections are not returned). The canonical federal counterparty identity key — pair with /api/gov/exclusions (debarment) and /api/law/sanctions-check (OFAC) for full counterparty due diligence.
/api/gov/entityPAYMENT-SIGNATURE.The entity API is a pay-per-call gov endpoint built for AI agents and autonomous software. Look up entities registered to do business with the US federal government in SAM.gov.
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 entity data source for an agent tool-use loop, an MCP host, or a backend that needs gov data on demand without onboarding to yet another vendor portal.
| Name | Type | Description |
|---|---|---|
legalBusinessName | string | min 2 chars · max 200 chars |
ueiSAM | string | min 12 chars · max 12 chars |
cageCode | string | min 3 chars · max 10 chars |
limit | integer | min 1 · max 100 |
# 1. Probe with no auth → 402 envelope with PaymentRequirements curl -sS 'https://2s.io/api/gov/entity?legalBusinessName=xx&ueiSAM=xxxxxxxxxxxx&cageCode=xxx&limit=10' # 2. Sign + retry with PAYMENT-SIGNATURE: curl -sS 'https://2s.io/api/gov/entity?legalBusinessName=xx&ueiSAM=xxxxxxxxxxxx&cageCode=xxx&limit=10' \ -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/gov/entity?legalBusinessName=xx&ueiSAM=xxxxxxxxxxxx&cageCode=xxx&limit=10'
import { TwoS } from '@2sio/sdk'
const client = new TwoS({
privateKey: process.env.EVM_PRIVATE_KEY as `0x${string}`,
})
const result = await client.gov.entity({
"legalBusinessName": "xx",
"ueiSAM": "xxxxxxxxxxxx",
"cageCode": "xxx",
"limit": 10
})
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.gov.entity(legalBusinessName="xx", ueiSAM="xxxxxxxxxxxx", cageCode="xxx", limit=10)
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": "gov.entity",
"arguments": {
"legalBusinessName": "xx",
"ueiSAM": "xxxxxxxxxxxx",
"cageCode": "xxx",
"limit": 10
}
}
}| Field | Type | Description |
|---|---|---|
ok | boolean | one of: true |
items | array | |
total | integer | Total matching rows upstream; null when unknown. |
source | object | |
meta | object |
{
"ok": true,
"items": [
{
"ueiSAM": "example",
"cageCode": "example",
"legalBusinessName": "example",
"dbaName": "example",
"samRegistered": false,
"registrationStatus": "example",
"registrationDate": "example",
"registrationExpirationDate": "example",
"lastUpdateDate": "example",
"purposeOfRegistration": "example",
"hasActiveExclusion": false,
"physicalAddress": {
"city": "example",
"state": "example",
"zip": "example",
"country": "example"
},
"businessTypes": [
"example"
]
}
],
"total": 1,
"source": {
"provider": "example",
"url": "example",
"license": "example"
},
"meta": {
"query": {
"legalBusinessName": "example",
"ueiSAM": "example",
"cageCode": "example",
"limit": 1
}
}
}