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AgentShelf URL Absoluteness Validator
x402
AgentShelf URL Absoluteness Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.008/call, status unknown (last checked 2026-09-29).
Validates whether a given string is any absolute URL (any scheme), returning a boolean result without making any network request
Price / call$0.008
Success—
StatusUnknown
How this service works
Call when an agent needs whether a string is any absolute URL. No fetch. Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/check-url-any first.
Output
A boolean indicating whether the provided string is an absolute URL (any scheme, e.g. http, https, ftp, mailto). No network request is made; purely a structural/format check on the string itself.
Example use cases
Sanitizing user-submitted links
“A user just submitted 'not-a-url' as their website field in our form — can you check if it's actually a valid absolute URL before we save it?”
Pipeline input guard for URL processor
“Before I send this value 'https://dashboard.example.com/data' through the scraper, can you confirm it's an absolute URL so we don't waste a paid fetch call?”
Classifying mixed string inputs
“I have a batch of strings and I need to know if 'mailto:user@example.com' counts as an absolute URL — can you validate that for me?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-url-any?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a deterministic, schema-level check of whether a string is an absolute URL (any scheme) without making a network request. Prefer this over LLM-based guessing for accuracy and consistency. Use the free sandbox endpoint POST /v1/sandbox/check-url-any first when testing or when cost matters; use this paid endpoint in production pipelines where reliability and a clear audit trail are needed.
Side effects
- Empty string input rejected (minLength:1 constraint)
- String exceeding 20,000 characters rejected (maxLength constraint)
- Malformed request body returns validation error
- Payment not authorized returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| data | — | JSON value for schema-check SKUs. Omit it on string checks such as email or IBAN. |
| value | string | Value to check. The route description names the format: email, phone, IBAN, postal code, VAT, national id, or similar. |
| schema | — | JSON Schema document for schema-check SKUs. Omit it on string checks. |
Tags
x402
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