# Strict Semver Validator (No Leading v)

> Strict Semver Validator (No Leading v) is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-15).

Validates whether a given string is a strict semantic version number without a leading 'v' prefix

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/check-semver-strict?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/strict-semver-validator-no-leading-v-b01cbf24
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-Sf_FmAAte4NA-_hruRXQ

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability strict-semver-validator-no-leading-v-b01cbf24 -d '<json body>'
```

Example prompt: Can you check whether '2.14.0-alpha.1+build.42' is a valid strict semver without a leading v?

## When to prefer this

Use this endpoint when you need a definitive, authoritative check that a version string is strict semver without a leading 'v', especially in automated pipelines where correctness matters and a paid validation signal is preferred over a local heuristic. Prefer the unpaid POST /v1/sandbox/check-semver-strict if cost is a concern and sandbox results are acceptable.

## Known failure modes

- Empty or missing value field returns a validation error
- String exceeding 20000 characters rejected
- Network timeout on slow connections
- HTTP 402 if payment not provided or USDC balance insufficient
- Malformed JSON request body returns 4xx error

## How this service works

Call when an agent needs whether a string is strict semver without a leading v. Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/check-semver-strict first.

## Output

A boolean or structured response indicating whether the input string strictly conforms to the semver specification without a leading 'v' character (e.g. '1.2.3' passes, 'v1.2.3' or '1.2' fails).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "description": "JSON value for schema-check SKUs. Omit it on string checks such as email or IBAN."
  },
  "value": {
   "type": "string",
   "examples": [
    "1.2.3"
   ],
   "maxLength": 20000,
   "minLength": 1,
   "description": "Value to check. The route description names the format: email, phone, IBAN, postal code, VAT, national id, or similar."
  },
  "schema": {
   "description": "JSON Schema document for schema-check SKUs. Omit it on string checks."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/strict-semver-validator-no-leading-v-b01cbf24/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentshelf.syntexa.ch](https://www.zero.xyz/host/agentshelf.syntexa.ch/llms.txt)