{"uid":"cap_0fAhpfp-LQFVzZmYJKnmx","slug":"signalharness-content-fingerprint-999f5fc9","name":"SignalHarness Content Fingerprint","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/content_fingerprint/invoke","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"html":{"type":"string","maxLength":65536,"minLength":1},"json":{"type":["object","array","string","number","boolean","null"]},"text":{"type":"string","maxLength":65536,"minLength":0},"type":{"type":"string","maxLength":128,"minLength":1},"base64":{"type":"string","pattern":"^[A-Za-z0-9+/]*={0,2}$","maxLength":65536,"minLength":0}}},"responseSchema":{"type":"json","example":{"replay":false,"result":{"type":"example","sha256":"0000000000000000000000000000000000000000000000000000000000000000","byteCount":0,"normalization":"example","normalizedLength":0,"normalizedSha256":"0000000000000000000000000000000000000000000000000000000000000000"},"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":"content_fingerprint","executionId":"example-execution","startedAtMs":0,"amountAtomic":"5000","resultSha256":"3861c2f5ca83c78359f3fc168c79d4dab10e7dc1d28858e724e9f33d397cb3b1","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_VHtwwDs9YPn3kyp7Rzy5L","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":"Computes a SHA-256 cryptographic fingerprint and byte-count of submitted content (HTML, JSON, text, or base64 binary) with normalization metadata for deduplication and integrity verification.","exampleAgentPrompt":"Can you fingerprint this HTML string for me and give me its SHA-256 hash plus a normalized hash so I can detect duplicates? Here's the content: '

Hello World

'","exampleUseCases":[{"title":"Deduplication of scraped web pages","prompt":"I'm scraping a bunch of web pages and want to avoid processing duplicates — can you fingerprint this HTML and give me a SHA-256 so I can compare it against pages I've already processed? Here's the HTML: '

Welcome to our site

'"},{"title":"JSON payload change detection","prompt":"Has this JSON configuration object changed since last time? Compute a fingerprint for it so I can store the hash and compare next time: {\"version\":\"2.1\",\"features\":[\"alpha\",\"beta\"],\"enabled\":true}"},{"title":"Text document integrity verification","prompt":"I need to prove this contract text hasn't been tampered with — generate a SHA-256 fingerprint for this text so I can record it: 'This agreement is entered into as of January 1, 2025 between Party A and Party B...'"}],"resultDescription":"Returns a JSON object containing: a SHA-256 hash of the raw content, a normalized SHA-256 hash (after applying a normalization strategy), the raw byte count, the normalization method name, the normalized content length, and a replay flag indicating if this is a repeated computation. Also includes a payment receipt with execution metadata, timing, and settlement reference.","failureModes":["Input content exceeds 65,536 character/byte limit — request rejected","No valid content field provided (html, json, text, or base64 all absent) — validation error","Invalid base64 encoding pattern — schema validation failure","Payment failure or insufficient USDC balance — 402 Payment Required","Malformed JSON body — 400 Bad Request"],"whenToPreferThis":"Choose this endpoint when you need a cryptographic fingerprint of arbitrary content (HTML, JSON, text, or binary) for deduplication, change detection, caching keys, or integrity verification — especially in agent workflows requiring per-call micropayment via x402/USDC. Prefer this over ad-hoc client-side hashing when you need server-side normalization (e.g., stripping whitespace from HTML before hashing) to ensure semantically equivalent content produces the same fingerprint.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:47:36.082Z","isFirstParty":false}