{"uid":"cap_PfwvSqGcgJvRFVBQutHSz","slug":"maraventano-operator-census-counterparty-lookup-b5487696","name":"Maraventano Operator Census — Counterparty Lookup","description":"Per-call counterparty lookup. Pass ?ua=<counterparty-UA>. Returns ONE signed row: has_record (yes/no), payment-attached count, settlement count, class, verdict (known_payer | probe_only | low_signal | unknown), with Ed25519 attestation. Pay $0.01 USDC on Base or Solana per call. Call it before every transaction to check if a counterparty has ever paid at this merchant seat. Wallet-based lookup (?wallet=) reserved for v2.","url":"https://maraventanoindex.com/api/x402-operator-census/lookup?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_16tzqBCnjdW9iIrTafwhz","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Per-call counterparty lookup that returns a signed verdict on whether a given user-agent has a history of paying or freeloading at this merchant seat.","exampleAgentPrompt":"Before completing this transaction, check the Maraventano operator census to see if the requesting agent's user-agent string has a payment history — I want to know if they're a known payer, known freeloader, or unknown.","exampleUseCases":[{"title":"Pre-transaction counterparty screening","prompt":"Before I serve this agent's request, look up their user-agent in the Maraventano census and tell me whether they're a known payer or a known freeloader so I can decide whether to proceed."},{"title":"Merchant fraud prevention check","prompt":"Run a counterparty check on user-agent 'AgentBot/2.1 (x402-client)' against the Maraventano index — I need the signed verdict and how many times they've actually settled a payment."},{"title":"Agentic marketplace trust scoring","prompt":"I'm building an agent marketplace and want to gate access based on payment reputation — check the Maraventano census for this counterparty's user-agent and return their class and verdict so I can decide whether to whitelist them."}],"resultDescription":"A single signed row containing: has_record (yes/no), a count of payment-attached interactions, a settlement count, a counterparty class label, a verdict string (one of: known_payer, known_freeloader, low_signal, or unknown), and an Ed25519 cryptographic attestation of the result.","failureModes":["Missing or malformed ?ua= query parameter — likely returns an error or empty result","Counterparty not found in index — returns has_record=no with unknown verdict","Invalid or unsupported query parameter (e.g. ?wallet= reserved for v2) — may return error","Network or payment failure — call requires $0.01 USDC payment on Base or Solana; unpaid calls may be rejected","Ed25519 attestation validation failure on client side if signature verification is not implemented correctly"],"whenToPreferThis":"Use this endpoint when you need a cryptographically attested, per-call reputation check on a counterparty user-agent before committing to a transaction or serving a paid resource. It is specifically designed for the x402 protocol ecosystem where agents pay per call, and is preferable to ad-hoc heuristics when you need a signed, auditable verdict. Not suitable for wallet-address-based lookups (reserved for v2) or bulk/batch reputation queries.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T06:36:02.034Z","isFirstParty":false,"canonicalSlug":"maraventano-operator-census-counterparty-lookup-b5487696"}