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FastX402 Lab Semver Match
x402
FastX402 Lab Semver Match is a paid API for AI agents from lab.fastx402.tools, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-17).
Filters a list of semantic versions against a semver range constraint, returning all matching versions plus the highest match
Price / call$0.002
Success—
StatusUnknown
How this service works
FastX402 Lab: small pay-per-call tools for AI agents, paid per request in USDC on Base over x402. No signup, no API key.
Output
Returns a JSON object with: the constraint string used, total versions checked, count of matches, an array of all matching version strings, and the highest matching version string.
Example use cases
Package upgrade compatibility check
“I have these library versions available: 1.8.0, 2.0.0, 2.1.5, 2.3.0, 3.0.0-beta.1 — which ones are compatible with the constraint >=2.0.0 <3.0.0, and what's the highest one I can upgrade to?”
Release candidate validation
“Can you check which of these release candidates — 1.0.0-rc.1, 1.0.0-rc.2, 1.0.0-rc.3, 1.1.0-rc.1 — satisfy the range ~1.0.0-rc, and tell me the highest matching one?”
Dependency resolution for CI pipeline
“My CI pipeline needs to pick a build tool version. From this list: 4.0.0, 4.1.0, 4.2.3, 5.0.0, 5.1.0, I need all versions that satisfy ^4.1.0. Which ones match and what's the highest?”
Technical details
Endpoint
GEThttps://lab.fastx402.tools/semver-match?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to programmatically filter a batch of semantic version strings against a semver range at low cost without setting up any authentication or API keys. Ideal for AI agents performing dependency resolution, CI/CD version selection, or release compatibility checks where a quick pay-per-call model fits better than maintaining a subscription. Prefer this over rolling your own semver logic or calling a full package registry API when you just need range-matching results.
Side effects
- Invalid semver range syntax returns an error or empty match set
- Malformed version strings in the list may be skipped or cause an error
- Exceeding 200 characters for versions or constraint may return a validation error
- Payment failure via x402 results in a 402 response with no result
- Pre-release version matching behavior may differ from expectations if range does not explicitly include pre-release identifiers
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"count": 2,
"checked": 6,
"highest": "2.5.1",
"matches": [
"2.4.0",
"2.5.1"
],
"constraint": "^2.4.0"
}
}Tags
x402
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