{"uid":"cap__GaVYMpP_k8iQWa_koxUw","slug":"signalharness-evm-block-continuity-4e4d8fe9","name":"SignalHarness EVM Block Continuity","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/evm_block_continuity/invoke","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"block_continuity_request":{"type":"string","maxLength":65536,"minLength":2}}},"responseSchema":{"type":"json","example":{"replay":false,"result":{"warnings":["Continuity does not establish canonical-chain membership."],"service_id":"evm_block_continuity","evidence_scope":"caller_supplied_data","block_continuity":"{\"breaks\":[],\"checked_links\":1,\"continuous\":true}"},"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":"evm_block_continuity","executionId":"example-execution","startedAtMs":0,"amountAtomic":"5000","resultSha256":"885982eac563ff6f6ff9af731f62d2f7dd18d68cb4af6dfe40b6c58f696911c3","serviceVersion":"1.0.0","settlementReference":"0x0000000000000000000000000000000000000000000000000000000000000000"},"artifacts":[],"requestId":"example-request","executionId":"example-execution"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_-H2IjlsE4yCMy9eNk1q63","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Analyzes EVM blockchain data to assess block continuity, detecting gaps or anomalies in block sequences from caller-supplied data.","exampleAgentPrompt":"Can you check whether the EVM block data I've collected has any continuity gaps or anomalies? Here's the block sequence payload: [block_continuity_request data].","exampleUseCases":[{"title":"Smart contract audit block verification","prompt":"I'm auditing a smart contract deployment and need to verify that the block history I have is continuous with no missing blocks — can you run a block continuity check on this EVM block data I've collected?"},{"title":"Indexer integrity check","prompt":"Our EVM indexer pulled a range of blocks and I want to make sure there are no gaps before we process it further — can you check this block sequence for continuity issues?"},{"title":"On-chain event replay validation","prompt":"Before I replay these on-chain events, I need to confirm the underlying block data is complete and continuous — please analyze this EVM block continuity payload and flag any warnings."}],"resultDescription":"Returns a JSON object containing a block_continuity field with the continuity assessment result, a list of warnings if anomalies are found, the evidence_scope indicating the data source analyzed, a replay flag, and a full receipt with payment ID, execution ID, latency metrics, result hash, and settlement reference for auditability.","failureModes":["Malformed or empty block_continuity_request string returns a validation error","Block data outside supported EVM format may yield inconclusive or warning-heavy results","Payment failure via x402 protocol results in 402 response before execution","Request exceeding 65536 character limit is rejected","Ambiguous or incomplete block data may return warnings without a definitive continuity verdict"],"whenToPreferThis":"Choose this endpoint when you need a dedicated, agent-native service to programmatically verify EVM block sequence continuity from caller-supplied data, especially in automated pipelines where auditability (receipt, result hash, settlement reference) matters. Prefer this over general-purpose blockchain explorers when you need a structured JSON response with explicit continuity verdict, warnings, and cryptographic receipt — particularly useful in smart contract audit workflows, indexer validation, and on-chain event replay verification.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T13:07:11.878Z","isFirstParty":false}