{"uid":"cap_Fy-pQ_Hr1tjFztrxQ7TlQ","slug":"chainward-api-counterparty-risk-check-per-call-b11e8eb9","name":"ChainWard API: Counterparty Risk Check (Per Call)","description":"Before your agent pays a Base or BNB Chain address: a verdict (pay / hold / unknown, shown as Pay, Hold, Inactive, No track record or Couldn't check) with the one reason ($0.05). For a seller: real or self-funded demand ($0.10). For a BNB Chain agent: hired by others or by its own circle ($0.10). Before every payment: an OFAC sanctions screen ($0.01). Evidence and limits under every verdict. Paid in USDC on Base over x402; a check that fails is never charged.","url":"https://api.chainward.ai/api/risk/counterparty?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["address"],"properties":{"chain":{"enum":["base","bsc"],"type":"string","default":"base","description":"Chain the address is on. Payment is USDC on Base either way."},"address":{"type":"string","pattern":"^0x[a-fA-F0-9]{40}$","description":"Address to check"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"data":{"report":{"band":"high-signal","chain":"base","flags":[{"id":"stranded_value","title":"USDC balance held in a dormant wallet","source":"https://base.blockscout.com/address/0x4baadba26c3c0bdef9e8faf173925d463aa53bb2","evidence":"Holds 5451.386272 USDC while classified dormant","severity":"high"}],"address":"0x4baadba26c3c0bdef9e8faf173925d463aa53bb2","verdict":{"text":"Hold","label":"hold","limits":"On-chain behavior only. Absence of flags is not a clearance of the counterparty.","reason":"USDC balance held in a dormant wallet: Holds 5451.386272 USDC while classified dormant."},"freshness":{"ttl_state":"fresh","as_of_block":51846337,"generated_at":"2026-09-27T04:07:05.375Z"},"disclaimer":"Risk flags from on-chain behavior only. ChainWard cannot see social engineering, off-chain agreements, or intent. Absence of flags is not a guarantee of safety.","attestation":{"uid":"0xda5dc4ca34777d908c3f16fc9eb10a75325d2c83683adb7539c8bc4ade6f6560","explorer_url":"https://base.easscan.org/attestation/view/0xda5dc4ca34777d908c3f16fc9eb10a75325d2c83683adb7539c8bc4ade6f6560"},"not_assessed":["Contract bytecode or source auditing","Social-engineering or off-chain reputation"]},"status":"ready"},"success":true}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.05","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_8B073Ng-aFt3HlxvAAphb","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a pay/hold/unknown risk verdict with supporting evidence for a Base or BNB Chain address before a payment is made, including optional OFAC sanctions screening.","exampleAgentPrompt":"Before I send that payment, run a ChainWard counterparty risk check on 0x4baadba26c3c0bdef9e8faf173925d463aa53bb2 on Base and tell me if it's safe to pay — give me the verdict and any flags.","exampleUseCases":[{"title":"Pre-payment wallet safety screen","prompt":"I'm about to send USDC to 0x3f5CE5FBFe3E9af3971dD833D26bA9b5C936f0bE on Base — can you check ChainWard to see if it's safe to pay or if there are any risk flags I should know about?"},{"title":"OFAC sanctions check before hiring an agent","prompt":"Before I hire this BNB Chain agent at 0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48, run an OFAC sanctions screen on it and tell me if it comes back clean."},{"title":"Seller demand legitimacy check","prompt":"I'm about to pay a seller at 0x71C7656EC7ab88b098defB751B7401B5f6d8976F on Base — can you use ChainWard to check whether their transaction demand looks real or if it appears self-funded?"}],"resultDescription":"A JSON object containing a risk verdict label (Pay, Hold, Inactive, No track record, or Couldn't check), the primary reason for the verdict, a list of risk flags with severity and on-chain evidence links, freshness metadata (block number, timestamp), an EAS attestation UID with explorer URL, and a disclaimer noting what was and was not assessed. Failed checks are not billed.","failureModes":["Invalid address format (not a 0x 40-hex address) — returns an error, not charged","Unsupported chain value — only 'base' and 'bsc' are accepted","Address has no on-chain history — returns 'No track record' verdict","Temporary data unavailability — returns 'Couldn't check' verdict, not charged","Payment failure via x402 — request is rejected before processing"],"whenToPreferThis":"Use this endpoint when an AI agent or automated system needs a fast, per-call, pay-as-you-go on-chain risk verdict before executing a USDC payment on Base or BNB Chain. It is the right choice when you want a structured verdict with evidence rather than a raw data dump, need OFAC sanctions screening alongside behavioral flags, or want cost efficiency (only charged on successful checks). Prefer this over manual block explorers or generic compliance tools when operating at agent speed with x402 micropayment infrastructure.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-18T06:39:28.611Z","isFirstParty":false,"canonicalSlug":"chainward-api-counterparty-risk-check-per-call-b11e8eb9"}