{"uid":"cap_NqUm7zrj9GX5cTSH5ysP3","slug":"obol-bitcoin-block-anomaly-detector-afae1e3d","name":"Obol 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-x402.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_SbJD5r1bq53AuQ9zWKdnx","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 specific 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 unusual fees, was empty, hit a difficulty retarget, had a timestamp inversion, a long gap from the prior block, or a weird coinbase message.","exampleUseCases":null,"resultDescription":"A cryptographically signed (Ed25519) JSON response listing which anomaly signals triggered for the requested block height, such as fee-exceeds-subsidy, empty block, difficulty retarget, timestamp inversion, long block gap, and coinbase message anomaly. The signature can be independently verified against the public key at /.well-known/obol-pubkey.","failureModes":["Block height not found or not yet mined — returns 404 or error","Invalid block height format (non-integer) — returns 400 bad request","Payment not included or insufficient — returns 402 Payment Required","Block height outside supported range — endpoint may return error","Service unavailable on fly.dev — returns 503"],"whenToPreferThis":"Use this endpoint when you need a truth-tested, cryptographically verifiable anomaly signal for a specific Bitcoin block height — especially useful for trading agents, research tools, or monitoring pipelines that need to flag unusual block conditions like fee spikes, empty blocks, or retargets at a known height. Prefer over raw RPC calls when you want pre-classified anomaly labels with cryptographic provenance.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T16:26:58.272Z","isFirstParty":false}