gov.counterparty

Federal counterparty due-diligence dossier on one name, in a single call. Give name (a company or person) and optional state; get back five independent federal/authoritative screens composed into one verdict: SAM.gov registration (UEI/CAGE, active status), SAM federal exclusions (debarment/suspension), OFAC SDN sanctions, GLEIF Legal Entity Identifier, and USAspending federal contract-award history. Returns headline riskFlags (e.g. federally_debarred, sanctions_high_confidence_match), a cleared boolean (true only when both debarment AND sanctions sources answered and were clean), a summary of booleans, and a per-source found/error/data block so one slow or empty source never fails the whole call. Composition of /api/gov/entity + /api/gov/exclusions + /api/law/sanctions-check + /api/business/lei + /api/gov/usaspending-awards — all free, public-domain US data. Name matching is probabilistic: review flagged matches manually and confirm with a hard identifier (UEI, LEI) before acting. For vendor onboarding, KYC/AML triage, grant eligibility, and procurement integrity. The federal counterpart to /api/business/entity-screen (which covers state registries).

price

$0.0072 USDC per call

method

GET/api/gov/counterparty

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
`name`required	string	min 2 chars · max 200 chars
`state`	string	min 2 chars · max 2 chars
`threshold`	number	min 0.1 · max 1
`limit`	integer	min 1 · max 20

Code samples

cURLbash

# 1. Probe with no auth → 402 envelope with PaymentRequirements
curl -sS 'https://2s.io/api/gov/counterparty?name=xx&state=xx&threshold=0.4&limit=5'

# 2. Sign + retry with PAYMENT-SIGNATURE:
curl -sS 'https://2s.io/api/gov/counterparty?name=xx&state=xx&threshold=0.4&limit=5' \
  -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/counterparty?name=xx&state=xx&threshold=0.4&limit=5'

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.gov.counterparty({
  "name": "xx",
  "state": "xx",
  "threshold": 0.4,
  "limit": 5
})

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.gov.counterparty(name="xx", state="xx", threshold=0.4, limit=5)

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": "gov.counterparty",
    "arguments": {
      "name": "xx",
      "state": "xx",
      "threshold": 0.4,
      "limit": 5
    }
  }
}

Response

Field	Type	Description
`query`	object
`riskFlags`	array
`cleared`	boolean
`summary`	object
`registration`	object
`exclusions`	object
`sanctions`	object
`lei`	object
`federalAwards`	object
`sources`	array
`note`	string

Example response datajson

{
  "query": {
    "name": "example",
    "state": "example"
  },
  "riskFlags": [
    "example"
  ],
  "cleared": false,
  "summary": {
    "samRegistered": false,
    "activeRegistration": false,
    "isDebarred": false,
    "isSanctioned": false,
    "hasLei": false,
    "federalAwardCount": 1
  },
  "registration": {
    "found": false,
    "error": "example",
    "data": {}
  },
  "exclusions": {
    "found": false,
    "error": "example",
    "data": {}
  },
  "sanctions": {
    "found": false,
    "error": "example",
    "data": {}
  },
  "lei": {
    "found": false,
    "error": "example",
    "data": {}
  },
  "federalAwards": {
    "found": false,
    "error": "example",
    "data": {}
  },
  "sources": [
    {
      "provider": "example",
      "url": "example",
      "license": "example"
    }
  ],
  "note": "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.