{"uid":"cap_kYckjdUqP2I19n0wKlWqf","slug":"reverse-agent-api-evidence-endpoint-17ce00fc","name":"Reverse Agent API – Evidence Endpoint","description":"Reverse Agent API by reverse.captcha — pay-per-use security and web utilities for autonomous agents.","url":"https://reversecaptcha.fun/v1/paid/evidence?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"url":{"type":"string","format":"uri","pattern":"^https://"}}},"responseSchema":{"type":"json","example":{"ok":true,"title":"Example Domain","sha256":"...","status":200,"final_url":"https://example.com/","fetched_at":"2026-01-01T00:00:00.000Z"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.03","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":"$0.03/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_-uBK79IELnN5UgblA1aAv","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.03","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Fetches a URL and returns a cryptographic SHA-256 hash fingerprint of the page content along with metadata, providing tamper-evident proof of what a page contained at a point in time.","exampleAgentPrompt":"Fetch https://example.com/terms-of-service and give me a SHA-256 fingerprint of the page along with the title and timestamp so I have tamper-evident proof of what it contains right now.","exampleUseCases":[{"title":"Compliance audit trail capture","prompt":"Go to https://acme.com/privacy-policy and capture a cryptographic hash of the page contents with a timestamp — I need tamper-evident evidence of what their privacy policy says today for our compliance records."},{"title":"Verify a live URL before citing it","prompt":"Before I cite https://blog.openai.com/gpt-5-announcement in my report, can you fetch it and give me a SHA-256 fingerprint of the page so I can prove the content existed and what it said at the time I referenced it?"},{"title":"Detect whether a contract page changed","prompt":"Fetch https://vendor.io/contract-terms and get me the SHA-256 hash of the current page — I want to compare it against the hash I captured last month to see if they've silently changed the terms."}],"resultDescription":"A JSON object with: `ok` (boolean success flag), `title` (page title string), `sha256` (hex SHA-256 hash of the page content), `status` (HTTP status code returned by the target URL), `final_url` (resolved URL after any redirects), and `fetched_at` (ISO 8601 timestamp of when the fetch occurred).","failureModes":["Non-HTTPS URLs are rejected by schema validation (must start with https://)","Target URL returns non-200 status — status field reflects this but ok may be false","Target URL is unreachable or times out — request fails with error","Redirects to a non-HTTPS final URL may cause issues","Payment failure via x402 protocol prevents the call from completing"],"whenToPreferThis":"Choose this endpoint when you need cryptographically verifiable, timestamped evidence of a webpage's contents — for audit trails, compliance documentation, content integrity checks, or proving what a URL contained at a specific moment. It is distinct from simple web scrapers because it returns a SHA-256 hash suitable for tamper-evident archiving, not just raw HTML or parsed text.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-23T14:06:23.552Z","isFirstParty":false,"canonicalSlug":"reverse-agent-api-evidence-endpoint-17ce00fc"}