{"uid":"cap_jej875QBn043fxYE-ne0G","slug":"bitcoin-block-anomaly-detector-ba80f1ec","name":"Bitcoin Block Anomaly Detector","description":"Validation-gated Bitcoin block anomaly detector / on-chain anomaly signal for a block height: fee-exceeds-subsidy, empty block, difficulty retarget, timestamp inversion, long block gap, coinbase message. Only truth-tested detectors are served. Free height list: GET /examples. Cryptographically signed (Ed25519) — every response is independently verifiable via /.well-known/obol-pubkey.","url":"https://obol-payai.fly.dev/signal/840000","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"pathParams":{"type":"object","required":["height"],"properties":{"height":{"type":"integer"}}},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"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":"down","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_Uc419tx8pb2Tfbfl2CewG","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":"Detects and returns on-chain anomaly signals for a given Bitcoin block height, including fee-exceeds-subsidy, empty block, difficulty retarget, timestamp inversion, long block gap, and coinbase message anomalies.","exampleAgentPrompt":"Check Bitcoin block 840000 for any on-chain anomalies — I want to know if it had unusually high fees, was empty, hit a difficulty retarget, had a timestamp inversion, a long gap, or anything weird in the coinbase message.","exampleUseCases":null,"resultDescription":"Returns a cryptographically signed (Ed25519) anomaly signal object for the specified block height, indicating which anomaly detectors fired (fee-exceeds-subsidy, empty block, difficulty retarget, timestamp inversion, long block gap, coinbase message), along with verifiable proof via the public key at /.well-known/obol-pubkey.","failureModes":["Invalid or non-integer block height returns a validation error","Block height not yet mined returns a not-found or out-of-range error","Payment not provided or insufficient returns HTTP 402 Payment Required","Network or upstream Bitcoin node unavailability causes 503 or timeout","Signature verification failure may indicate tampered response"],"whenToPreferThis":"Use this endpoint when you need a lightweight, pre-validated, cryptographically verifiable anomaly signal for a specific Bitcoin block height without running your own node or writing custom detection logic. Ideal for agents that need trustworthy on-chain anomaly flags at low cost ($0.01 USDC per call) with independent verifiability.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T15:25:15.089Z","isFirstParty":false}