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Safe Upgrade Decision API – Document Comparison
x402
Safe Upgrade Decision API – Document Comparison is a paid API for AI agents from x402-safe-upgrade-api.onrender.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-11).
Compares two text documents (e.g. changelogs, README files, package docs) and returns similarity metrics to support evidence-backed npm package upgrade decisions.
Price / call$0.02
Success—
StatusUnknown
How this service works
Evidence-backed npm package upgrade decisions for coding agents.
Output
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.
Example use cases
Automated dependency bump safety check
“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.”
Breaking change detection before release
“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.”
Changelog drift review in CI pipeline
“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.”
Technical details
Endpoint
POSThttps://x402-safe-upgrade-api.onrender.com/v1/document-comparison?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| leftText | string | Content supplied by the caller only; it is processed in memory and not retained. |
| leftLabel | string | |
| rightText | string | Content supplied by the caller only; it is processed in memory and not retained. |
| rightLabel | string |
Output
Schema · Response
{
"type": "json",
"example": {
"summary": {
"lineSimilarity": 0.5
}
}
}Tags
x402
Reviews
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