{"uid":"cap_PKq_qFbafm_K1KOyHlM9L","slug":"base-contract-ground-truth-b70b3e61","name":"Base Contract Ground Truth","description":"Deterministic, chain-derived facts about any address on Base mainnet. Returns what the chain actually says — never a score, a rating, or a recommendation.","url":"https://base-groundtruth-x402.base-agent-tools.workers.dev/token/%7Baddress%7D?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"json","example":{"chain":{"name":"base","chainId":8453,"blockNumber":"38000000"},"erc20":{"symbol":"USDC","decimals":6,"conformsToRequiredInterface":true},"proxy":{"isProxy":true,"standard":"zeppelinos"},"address":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","ownership":{"ownershipRenounced":false,"exposesOwnerFunction":true},"isContract":true,"capabilities":{"detected":[{"function":"mint(address,uint256)"}]}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","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":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_yQaFPOhfI4_EGqRw4iBmD","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns deterministic, chain-derived facts about any address on Base mainnet — contract type, ERC-20 metadata, proxy pattern, ownership, and detected capabilities — with no scoring or recommendations.","exampleAgentPrompt":"Pull the on-chain ground truth for the Base mainnet address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 — I want to know if it's a proxy, whether ownership has been renounced, and what its ERC-20 symbol and decimals are.","exampleUseCases":[{"title":"Verify token before DeFi integration","prompt":"Before we integrate this token into our DeFi app, check the Base mainnet address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 — does it actually conform to the ERC-20 interface, what are its decimals, and is it a proxy contract?"},{"title":"Ownership renouncement audit","prompt":"I need to audit this Base contract at 0x4200000000000000000000000000000000000006 — has ownership been renounced, and does it expose an owner function? Give me the raw chain facts, no scores."},{"title":"Detect mint capability on token","prompt":"Check the Base mainnet contract 0x2Ae3F1Ec7F1F5012CFEab0185bfc7aa3cf0DEc22 and tell me whether it has a mint function detected on-chain and what ERC-20 symbol it uses."}],"resultDescription":"A JSON object containing: the chain context (name, chainId, current blockNumber), ERC-20 metadata (symbol, decimals, interface conformance), proxy detection (isProxy, standard such as zeppelinos), ownership details (ownershipRenounced, exposesOwnerFunction), a boolean isContract flag, and an array of detected on-chain capabilities (e.g. mint function signatures). All values are derived directly from Base mainnet state — no scores or ratings are included.","failureModes":["Address not found or is an EOA — isContract returns false with minimal metadata","Invalid or malformed address format — likely a 400 or error response","Network/RPC timeout when querying Base mainnet state","Payment failure (x402) — call rejected if USDC micropayment not satisfied","Contract ABI not decodable — some fields may be null or absent for non-standard contracts"],"whenToPreferThis":"Choose this endpoint when you need raw, deterministic, chain-derived facts about a Base mainnet address with no interpretive layer — ideal for pre-integration audits, compliance checks, bot detection pipelines, or any workflow where you must confirm on-chain state (proxy pattern, mint capability, ERC-20 conformance) without relying on a third-party risk score. Prefer it over block explorer scraping (unreliable, rate-limited) or scored APIs (opaque methodology) when ground truth is required.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-13T00:30:03.086Z","isFirstParty":false,"canonicalSlug":"base-contract-ground-truth-b70b3e61"}