{"service":"CounterpartyCheck","version":"1.0.0","tagline":"One-call counterparty screen with a signed verdict, agent-callable.","description":"One-call counterparty screen for agents. Before your agent pays, onboards or trades with a wallet, one x402 call runs the full check a compliance desk would: exact match against the ~500 crypto addresses on the US Treasury OFAC SDN list, an optional OFAC name/entity screen (SDN + alternate names), on-chain wallet risk (GoPlus flags such as sanctioned, mixer, phishing, money laundering), and a wallet profile (portfolio value, first seen, activity, exchange contacts, address-poisoning signs). Chain defaults to auto: Ethereum and Base are both checked and the active one is profiled. Returns one PASS / REVIEW / BLOCK with plain-language reasons and warnings, signed as an LSO Receipt (secp256k1 / EIP-191; ethers.verifyMessage must recover LSO's published signer). $0.25 in USDC on Base or Solana via x402 (the same three checks bought separately cost $0.30). Sources: OFAC SDN (refreshed daily), GoPlus, Alchemy/public RPC, DexScreener.","when_to_call":["Before paying, onboarding or trading with a wallet you don't know","Screen an exchange, OTC desk, agent or company wallet against OFAC in one call","Get a signed, independently verifiable verdict to store for your records or pass on-chain"],"price":"$0.25 USDC via x402 (Base or Solana)","payment":{"protocol":"x402","network":"base-mainnet","asset":"USDC","payTo":"0x52Ab53912D37759B2ad364f22dD06B16714b6C06"},"endpoints":{"/screen?wallet=<address>&name=<optional>&chain=<optional, default auto>":"counterparty verdict + signed receipt  $0.25","/signer":"LSO receipt signer address + how to verify (free)","/health":"status (free)"},"related":{"KYACheck":"https://kya.lonestaroracle.xyz ($0.10, OFAC + wallet risk only)","SanctionsScreen":"https://sanctions.lonestaroracle.xyz ($0.05, OFAC name/wallet only)"},"provider":"LoneStarOracle","catalog":"https://lonestaroracle.xyz","a2a":"https://lonestaroracle.xyz/.well-known/agent-card.json"}