{"uid":"cap_wIurP8pWKk-Os6v8dipo8","slug":"hergert-synthora-onchain-data-api-a7b893b9","name":"Hergert Synthora Onchain Data API","description":"SYNTHORA Onchain Primitives: multichain (Base/Ethereum/Polygon/Arbitrum/Optimism) transaction receipts, tx lookup, wallet nonce, contract/proxy (EIP-1967) detection, ENS resolution, ERC20 + native balances, contract introspection. Deterministic, Ed25519-signed. 0.001 USDC via x402 on Base. First 3 calls FREE per wallet — send header 'X-WALLET: 0x<your Base address>' (no payment); after that 0.001 USDC per call.","url":"https://api.hergertsynthora.com/v1/onchain","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"op":{"enum":["ens","receipt","tx","nonce","code","proxy","balance","erc20-balance","contract","network"],"type":"string","description":"Operation to perform"},"hash":{"type":"string","description":"Tx hash 0x… (receipt/tx)"},"name":{"type":"string","description":"ENS name e.g. vitalik.eth (ens)"},"chain":{"enum":["base","ethereum","polygon","arbitrum","optimism"],"type":"string","description":"Chain (default ethereum)"},"token":{"type":"string","description":"ERC20 token address (erc20-balance)"},"address":{"type":"string","description":"Address 0x… (nonce/code/proxy/balance/contract)"}}},"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_8IXMS1v_Dpwi-6l6jG0RQ","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":"Queries on-chain blockchain data across multiple EVM networks, supporting operations like ENS resolution, transaction lookup, balance checks, contract inspection, and nonce retrieval.","exampleAgentPrompt":"Can you resolve the ENS name vitalik.eth to its current Ethereum address using the onchain lookup service?","exampleUseCases":[{"title":"ENS name resolution for payments","prompt":"What Ethereum address does vitalik.eth point to right now? I need to verify the wallet before sending funds."},{"title":"Transaction confirmation check","prompt":"Can you pull the receipt for transaction 0xabc123… on Base and tell me whether it confirmed successfully?"},{"title":"ERC20 balance audit","prompt":"Check the USDC balance for wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Ethereum mainnet — I need the exact token balance."}],"resultDescription":"Returns a JSON object with ok:true, the operation name, and a result object containing the query-specific data (e.g. resolved address for ENS, transaction details for receipt/tx, balance as a number, bytecode string, nonce integer, proxy implementation address, or network metadata). Responses are signed with ed25519.","failureModes":["Invalid or malformed address/hash returns an error result","ENS name not found returns found:false","Unsupported chain value returns validation error","Missing required field for the chosen op (e.g. no hash for receipt) causes a 400-level error","Network timeout or RPC node unavailability returns a service error","Payment not received or insufficient USDC causes a 402 rejection"],"whenToPreferThis":"Choose this endpoint when you need lightweight, pay-per-call on-chain data queries across multiple EVM chains (Ethereum, Base, Polygon, Arbitrum, Optimism) without setting up your own RPC infrastructure. It is well-suited for agents that need to resolve ENS names, verify transactions, check balances, or inspect contracts on demand. The x402 micropayment model ($0.05 USDC per call) makes it cost-effective for occasional queries without a subscription.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T18:49:58.096Z","isFirstParty":false}