{"uid":"cap_2LwoYEqDhCfZMl5I8vLeb","slug":"safe-upgrade-decision-api-document-comparison-3194fb71","name":"Safe Upgrade Decision API – Document Comparison","description":"Evidence-backed npm package upgrade decisions for coding agents.","url":"https://x402-safe-upgrade-api.onrender.com/v1/document-comparison?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"leftText":{"type":"string","maxLength":200000,"description":"Content supplied by the caller only; it is processed in memory and not retained."},"leftLabel":{"type":"string"},"rightText":{"type":"string","maxLength":200000,"description":"Content supplied by the caller only; it is processed in memory and not retained."},"rightLabel":{"type":"string"}}},"responseSchema":{"type":"json","example":{"summary":{"lineSimilarity":0.5}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","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":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_K_GsiXP065Z1805YtfGn6","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Compares two text documents (e.g. changelogs, README files, package docs) and returns similarity metrics to support evidence-backed npm package upgrade decisions.","exampleAgentPrompt":"Compare the old changelog text for lodash 4.17.20 with the new changelog for 4.17.21 and tell me how similar they are so I can decide if the upgrade is safe — here's the old text: [old changelog] and here's the new text: [new changelog].","exampleUseCases":[{"title":"Automated dependency bump safety check","prompt":"I'm about to merge a Dependabot PR that bumps react from 18.2.0 to 18.3.0. Compare the old CHANGELOG section for 18.2.0 with the new one for 18.3.0 and give me a similarity score so I can judge whether this is a safe upgrade."},{"title":"Breaking change detection before release","prompt":"Can you compare the API docs from axios 1.3.0 with axios 1.4.0 and tell me how similar they are? I want to know if there are likely breaking changes before I update our production build."},{"title":"Changelog drift review in CI pipeline","prompt":"In our CI pipeline we want to flag upgrades where the new package readme is significantly different from the old one. Compare the leftText from the old eslint README and the rightText from the new eslint README and return the line similarity score."}],"resultDescription":"A JSON object containing a summary with at least a `lineSimilarity` score (0–1 float) indicating how similar the two input documents are. Higher scores mean the documents are more alike, suggesting lower upgrade risk.","failureModes":["Input text exceeds 200,000 character limit — request rejected","Missing required fields (leftText or rightText) — validation error","Service unavailable on Render cold start — timeout or 503","Payment not included or insufficient — 402 Payment Required response","Empty documents submitted — may return similarity of 1.0 or 0.0 unexpectedly"],"whenToPreferThis":"Choose this endpoint when a coding agent or CI pipeline needs a fast, quantitative similarity signal between two document versions (changelogs, READMEs, release notes) to make an evidence-backed npm upgrade decision. It is especially useful when you want a lightweight numeric score rather than a full semantic diff or LLM-generated summary.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T18:33:47.758Z","isFirstParty":false,"canonicalSlug":"safe-upgrade-decision-api-document-comparison-3194fb71"}