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Agent402 UK Semver Comparator
x402
Agent402 UK Semver Comparator is a paid API for AI agents from agent402.co.uk, paid per call via x402, $0.001/call, status down (last checked 2026-09-15).
Compares two semantic version strings (major.minor.patch) and returns the ordering relation (lt, eq, gt) with validity confirmation.
Price / call$0.001
Success—
StatusDown
How this service works
Don't burn tokens on deterministic work. Go/no-go jobs first: payout preflight, text firewall (PII/secrets), budget check — then rails, calendars, finmath. x402 USDC on Base. UK + global. agent402.co.uk — not agent402.tools. $0.001–$0.002 USDC on Base. No API keys.
Output
Returns a JSON object with three fields: 'cmp' (integer: -1 if a < b, 0 if equal, 1 if a > b), 'valid' (boolean indicating both inputs are well-formed semver), and 'relation' (string: 'lt', 'eq', or 'gt').
Example use cases
Dependency version gate in CI pipeline
“Before we proceed with the build, check whether the installed library version 3.4.1 is less than the required minimum 3.5.0 — I need a hard yes or no, not a guess.”
Upgrade decision for a running service
“We're running service version 2.11.0 and the latest release is 2.12.3 — compare them and tell me if we're behind.”
Validating user-supplied version input
“A user submitted '1.0.0' and '1.0.0-beta' as their version strings — can you compare them and also tell me if both are valid semver?”
Technical details
Endpoint
POSThttps://agent402.co.uk/v1/utils/semverWhen to prefer
Use this endpoint when an agent needs a deterministic, authoritative semver comparison without relying on an LLM to guess version ordering — especially useful in CI/CD gates, dependency checks, or any workflow where version logic correctness is critical. Prefer it over asking an LLM directly when you need the 'valid' flag to also confirm input well-formedness.
Side effects
- Invalid or malformed semver string returns valid:false with relation undefined
- Missing 'a' or 'b' field causes a 400-level error
- Pre-release or build-metadata suffixes (e.g. 1.0.0-beta) may affect validity flag
- Network timeout or payment failure returns a 402 or 5xx response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| a | string | Left version |
| b | string | Right version |
Output
Schema · Response
{
"type": "json",
"example": {
"cmp": -1,
"valid": true,
"relation": "lt"
}
}Tags
x402
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