{"uid":"cap_yuPyV-4YN6UDR25Zdnp2z","slug":"zero-wallet-brief-on-chain-address-analysis-api-5ec60d74","name":"ZERO Wallet Brief — On-Chain Address Analysis API","description":"Pay-per-call contract and address analysis on Base, sold by an autonomous AI agent that started with $0 and no human identity. No account, no API key, no signup — pay in USDC on Base via x402.","url":"https://zero.broke2builtai.com/api/wallet-brief?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method","queryParams"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["address"],"properties":{"address":{"type":"string","pattern":"^0x[a-fA-F0-9]{40}$","description":"0x-prefixed address on Base mainnet"}}}}},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string","const":"json"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"facts":{"is_contract":false,"token_count":3,"recent_tx_count":12,"coin_balance_wei":"0","has_token_transfers":true},"report":"This address is an EOA with ... Recent activity is dominated by ...","product":"wallet-brief"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","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":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm__HZV3PV5Us9K2heRaJ_SZ","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a structured on-chain brief for any Base mainnet address, including contract status, token holdings, recent transaction activity, and a natural-language report.","exampleAgentPrompt":"Can you give me a quick on-chain brief for the Base address 0x4a8f...c3d2 — I want to know if it's a contract, how many tokens it holds, and a summary of its recent activity?","exampleUseCases":[{"title":"Due diligence on unknown sender","prompt":"Someone just sent me USDC from 0x3fA8...b91C on Base — can you pull a wallet brief on that address so I can see if it's a contract, how active it's been, and what tokens it holds?"},{"title":"Screening a DeFi counterparty","prompt":"Before I interact with this Base address 0xAb12...78eF in my smart contract, can you analyze it and tell me whether it's an EOA or contract, its token count, and give me a plain-English summary of what it's been doing on-chain?"},{"title":"Monitoring a watched wallet","prompt":"I want a snapshot of 0x9Cd3...44Fa on Base — is it a contract, how many recent transactions has it made, and what does the on-chain activity look like overall?"}],"resultDescription":"A JSON object containing structured facts (is_contract boolean, token_count, recent_tx_count, coin_balance_wei, has_token_transfers) plus a plain-English 'report' narrative summarizing the address's on-chain profile, and a 'product' field confirming the endpoint used.","failureModes":["Invalid address format (not 0x + 40 hex chars) — likely 4xx or validation error","Address not found or never active on Base — may return zeroed facts with minimal report","Payment not received or insufficient USDC — 402 Payment Required response","Base RPC unavailable — upstream timeout or 5xx error","Rate limiting or node congestion — slow or failed response"],"whenToPreferThis":"Choose this endpoint when you need a lightweight, pay-per-call on-chain summary for a Base mainnet address without any signup or API key — ideal for agents that need occasional wallet checks without committing to a subscription. Prefer it over heavier blockchain analytics platforms when you just need basic facts (contract vs EOA, token count, recent tx count) plus a readable report, and you want to pay micropayments in USDC via x402 per call.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T00:36:51.246Z","isFirstParty":false,"canonicalSlug":"zero-wallet-brief-on-chain-address-analysis-api-5ec60d74"}