{"uid":"cap_AFCD5sVjJ0Y5Dnw5UoxwK","slug":"signalharness-abi-event-topics-decoder-d413dadf","name":"SignalHarness ABI Event Topics Decoder","description":"Explore 330 pay-per-call x402 API services and 27 agent-native digital products, with Base USDC pricing, secure Polar checkout, and free discovery.","url":"https://signalharness.ai/api/agent/services/abi_event_topics/invoke","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"abi_event_topics_request":{"type":"string","maxLength":65536,"minLength":2}}},"responseSchema":{"type":"json","example":{"replay":false,"result":{"warnings":["Constructed topics do not query any chain."],"service_id":"abi_event_topics","event_topics":"{\"signature\":\"Changed(address,uint256)\",\"topics\":[\"0xb52dda022b6c1a1f40905a85f257f689aa5d69d850e49cf939d688fbe5af5946\",\"0x0000000000000000000000000000000000000000000000000000000000000001\"]}","evidence_scope":"caller_supplied_data"},"status":"succeeded","receipt":{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","usage":[],"status":"succeeded","network":"eip155:8453","artifacts":[],"endedAtMs":0,"latencyMs":0,"paymentId":"example-payment","receiptId":"example-receipt","requestId":"example-request","serviceId":"abi_event_topics","executionId":"example-execution","startedAtMs":0,"amountAtomic":"10000","resultSha256":"6858fbc2bffcb1165931364d11fdbcfc05e8571ab284c6513dcb18cce06b38f3","serviceVersion":"1.0.0","settlementReference":"0x0000000000000000000000000000000000000000000000000000000000000000"},"artifacts":[],"requestId":"example-request","executionId":"example-execution"}},"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_v0mbXM_YyByP-ZPAo6Oa5","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":"Decodes ABI-encoded Ethereum event topics from smart contract logs into human-readable structured data","exampleAgentPrompt":"Decode these ABI-encoded event topics from a smart contract log for me: [0xddf252ad1be2c89b69c2b068fc378daa952ba7f20b8ebc2e67d1a3d6f4a6b3a5, 0x000000000000000000000000abc123..., 0x000000000000000000000000def456...] — I need to know what event this is and what values were emitted.","exampleUseCases":[{"title":"Parse ERC20 Transfer Event Logs","prompt":"I have raw log topics from an Ethereum transaction receipt that look like hex strings — can you decode these ABI event topics so I can see the sender, receiver, and token amount from the Transfer event?"},{"title":"Debug Smart Contract Event Emission","prompt":"My smart contract emitted an event but I only have the raw topics array from the tx log. Decode these ABI event topics for me so I can verify the correct arguments were emitted during the contract call."},{"title":"Extract NFT Mint Event Parameters","prompt":"I'm indexing NFT mint events and I have a raw topics array from a contract log. Can you decode these ABI-encoded event topics to extract the token ID and recipient address from the Transfer event?"}],"resultDescription":"Returns a JSON object containing decoded event topics as human-readable data, any warnings about the input data, the service ID, and an evidence scope indicator. Also includes a full execution receipt with payment details, latency, a SHA-256 result hash, and settlement reference for auditability.","failureModes":["Malformed or truncated ABI topic string returns a warning or failed status","Input that is not valid ABI-encoded data may produce incorrect or empty decoded output","Exceeding the 65536-character input limit causes a validation error","Unsupported or unrecognized ABI event signatures may result in partial decoding with warnings"],"whenToPreferThis":"Choose this endpoint when you need to decode raw ABI-encoded Ethereum event topics from smart contract transaction logs into structured, human-readable data. It is purpose-built for EVM log decoding, operates per-call at $0.01 USDC via x402, and returns an auditable receipt with a result hash — making it suitable for agent pipelines that require verifiable blockchain data extraction.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-16T00:54:52.283Z","isFirstParty":false}