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FastX402 Semantic Version Comparator
x402
FastX402 Semantic Version Comparator is a paid API for AI agents from fastx402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-28).
Compares two semantic version strings and returns their ordering relationship and parsed components
Price / call$0.001
Success—
StatusUnknown
How this service works
200 pay-per-call tools for AI agents, from $0.001 per request in USDC on Base or Solana with x402. No account, no API key.
Output
Returns a JSON object containing both input version strings, each parsed into major, minor, patch, prerelease, and build fields, plus a human-readable relation string (e.g. 'a < b') and a numeric comparison value (-1, 0, or 1) indicating ordering.
Example use cases
Dependency upgrade decision
“I need to know if version 3.1.0-rc.2 is newer than 3.0.9 — can you compare them and tell me the ordering?”
CI pipeline version gate
“Check whether 1.5.0+build.42 comes before or after 1.5.0 — I need to know the exact semver relation between them.”
Release changelog ordering
“I have two release tags: v4.0.0-alpha.1 and v4.0.0-alpha.10. Which one is the later version according to semver rules?”
Technical details
Endpoint
GEThttps://fastx402.tools/semver-compare?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need strict semver-spec-compliant comparison including prerelease precedence rules, or when you need the parsed breakdown of version components. Prefer it over string sorting or regex-based comparisons, which fail on prerelease ordering (e.g. 1.0.0-alpha < 1.0.0).
Side effects
- Invalid semver string (e.g. missing patch segment) may return an error or unexpected parse
- Missing required query parameters 'a' or 'b' returns a validation error
- Build metadata differences may be ignored per semver spec, resulting in comparison=0 even when build strings differ
- Payment failure via x402 protocol blocks the request entirely
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"a": "1.0.0-alpha.1",
"b": "1.0.0-alpha.2",
"a_parsed": {
"build": [],
"major": 1,
"minor": 0,
"patch": 0,
"prerelease": [
"alpha",
1
]
},
"b_parsed": {
"build": [],
"major": 1,
"minor": 0,
"patch": 0,
"prerelease": [
"alpha",
2
]
},
"relation": "a < b",
"comparison": -1
}
}Tags
x402
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