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AgentShelf Date String Validator
x402
AgentShelf Date String Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).
Validates whether a given string is a real, well-formed YYYY-MM-DD date
Price / call$0.01
Success—
StatusUnknown
How this service works
Call when an agent needs whether a string is a real YYYY-MM-DD date. Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/check-date-date first.
Output
Returns a validation result indicating whether the input string represents a real, correctly formatted YYYY-MM-DD calendar date, including checks for valid months, days, and leap years.
Example use cases
Form input date validation
“The user submitted '2023-11-31' as their birthdate — can you verify if that's actually a real calendar date in YYYY-MM-DD format?”
Pipeline data quality gate
“Before I process this batch record, check if '2025-00-15' is a legitimate YYYY-MM-DD date or garbage data I should reject.”
Chatbot date parsing guard
“A user typed '2024-13-01' as their appointment date — is that a real date I can accept, or should I ask them to re-enter it?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-date-date?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to confirm that a string both matches the YYYY-MM-DD format AND represents a real calendar date (e.g. correctly handles leap years, invalid month/day combos). The description notes a free sandbox alternative at POST /v1/sandbox/check-date-date should be tried first before incurring the $0.01 USDC charge. Prefer this paid endpoint only when the sandbox is unavailable or you need production reliability guarantees.
Side effects
- Empty or missing value field returns an error
- String longer than 20000 characters rejected by schema
- Non-string input types may cause validation errors
- Network or payment failure returns 402 or 5xx
- Ambiguous date strings not in YYYY-MM-DD format may return false negatives
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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