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npm Package API Breaking-Change Diff
x402
npm Package API Breaking-Change Diff is a paid API for AI agents from x402-canary.nicolas-x402-16f380a7.workers.dev, paid per call via x402, $0.025/call, status unknown (last checked 2026-09-15).
Compares two versions of an npm package and returns a structured diff of added, changed, and removed TypeScript/API symbols with a risk assessment.
Price / call$0.025
Success—
StatusUnknown
How this service works
Free need-to-tool routing plus pay-per-call npm docs and TypeScript API signatures, npm breaking-change diffs, JavaScript-rendered browser snapshots and deterministic coding-agent checks via AgentCash/x402.
Output
Returns a JSON object with a risk field ('LOW', 'MEDIUM', or 'HIGH'), the package name, from and to versions, and three arrays: added_symbols, changed_symbols, and removed_symbols — each describing TypeScript/API surface changes between the two specified versions.
Example use cases
Pre-upgrade dependency safety check
“Before I update hono from 4.12.0 to 4.13.2 in my project, can you tell me what API symbols were removed or changed so I know what to fix?”
Automated CI breaking-change gate
“Check whether upgrading react-query from version 4.0.0 to 5.0.0 introduces any breaking changes and tell me the overall risk level.”
Library migration risk assessment
“I'm considering upgrading axios from 1.3.0 to 1.6.0 — what symbols were added, changed, or removed between those two versions?”
Technical details
Endpoint
POSThttps://x402-canary.nicolas-x402-16f380a7.workers.dev/v1/agent/npm-api-diffWhen to prefer
Use this endpoint when an AI coding agent needs to automatically assess upgrade safety for an npm package before modifying package.json, generating migration code, or advising a developer. It is ideal over manual changelog parsing because it returns structured, machine-readable symbol diffs with a risk classification specifically from TypeScript API signatures.
Side effects
- Unknown or misspelled package name returns an error or empty result
- Version string not found on npm registry returns a version-not-found error
- Malformed semver strings may cause parsing failures
- Packages without TypeScript typings may yield empty symbol arrays with no meaningful diff
- Network timeout if the npm registry is slow to respond
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| package | string | |
| to_version | string | |
| from_version | string |
Output
Schema · Response
{
"type": "json",
"example": {
"data": {
"risk": "MEDIUM",
"package": "hono",
"to_version": "4.13.2",
"from_version": "4.12.0",
"added_symbols": [],
"changed_symbols": [],
"removed_symbols": []
},
"meta": {
"engine": "npm-api-diff"
}
}
}Tags
x402
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