{"uid":"cap_4c09l40wUkXBFAISaML4T","slug":"signalharness-base-event-sequence-analyzer-4d131244","name":"SignalHarness Base Event Sequence Analyzer","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/base_event_sequence_analyze/invoke","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"request_json":{"type":"string","maxLength":65536,"minLength":2}}},"responseSchema":{"type":"json","example":{"replay":false,"result":{"warnings":["Ordering relies on supplied block/transaction/log indexes."],"service_id":"base_event_sequence_analyze","analysis_json":"{\"ambiguous_order\":false,\"count\":1,\"events\":[{\"_source_index\":0,\"address\":\"0x0000000000000000000000000000000000000001\",\"block_number\":1,\"chain\":\"8453\",\"log_index\":0,\"transaction_index\":0}],\"network_context\":{\"accepted_chain_ids\":[\"8453\",\"84532\"],\"deposit_transaction_type\":\"0x7e\",\"fee_model\":\"L2 execution plus caller-supplied L1 data/operator components\",\"protocol_family\":\"OP Stack\"}}","evidence_scope":"caller_supplied_data","analyzed_network":"base"},"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":"base_event_sequence_analyze","executionId":"example-execution","startedAtMs":0,"amountAtomic":"15000","resultSha256":"63250bafa752cc7ac2e6c3887baf92a5b318588976e94347d0fc1baba966c87f","serviceVersion":"1.0.0","settlementReference":"0x0000000000000000000000000000000000000000000000000000000000000000"},"artifacts":[],"requestId":"example-request","executionId":"example-execution"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.015","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":"$0.015/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.015","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.015","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_BkhtJkKMkN2IBljTRVxaM","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.015","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Analyzes and orders a sequence of Base blockchain events, resolving ambiguities in event ordering and returning structured analysis with chain context.","exampleAgentPrompt":"Analyze the ordering of these Base blockchain events for me — I have a set of logs with block numbers, transaction indexes, and log indexes, and I need to know if their sequence is unambiguous and what the correct order is.","exampleUseCases":[{"title":"Verify DeFi transaction event order","prompt":"I have a series of events from a Base mainnet DeFi transaction — transfer and swap logs with their block numbers and log indexes. Can you analyze them and tell me if their ordering is unambiguous and what the canonical sequence is?"},{"title":"Debug smart contract log sequencing","prompt":"I'm debugging a smart contract on Base and I have about 5 event logs with different transaction indexes. Can you run them through the Base event sequence analyzer and tell me if there's any ordering ambiguity?"},{"title":"Audit cross-contract event timeline","prompt":"I need to audit the event timeline for a series of interactions across two Base contracts — here are the raw events with block numbers and log indexes. Can you analyze the sequence and flag any ordering issues?"}],"resultDescription":"Returns a JSON analysis including whether event ordering is ambiguous, the count of events, an ordered list of events with their source index, address, block number, chain ID, log index, and transaction index, plus network context for Base (accepted chain IDs, deposit transaction type, fee model, and OP Stack protocol family). Also returns evidence scope and analyzed network identifier.","failureModes":["Missing or malformed request_json causes validation error","Events without required block/transaction/log indexes may produce unreliable ordering","Supplying events from unsupported chain IDs (not 8453 or 84532) may return an error or unrecognized network","Empty event list may return empty analysis","Extremely large event arrays may exceed maxLength constraint on request_json"],"whenToPreferThis":"Use this endpoint when you have a set of raw Base blockchain event logs and need to determine their canonical ordering or detect ordering ambiguity. It is purpose-built for Base (chain ID 8453) and Base Sepolia (84532) with OP Stack-aware context, making it more appropriate than generic EVM log parsers when working specifically on Base. Ideal for agents auditing DeFi transactions, debugging smart contract interactions, or building reliable event-driven pipelines on Base.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T06:30:06.299Z","isFirstParty":false}