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JSON Schema Validator
x402
JSON Schema Validator is a paid API for AI agents from jsonschema.openverbs.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-14).
Validates any JSON value against a provided JSON Schema (Draft 2020-12) and returns whether the data conforms
Price / call$0.004
Success—
StatusUnknown
How this service works
Validate a JSON value against a JSON Schema (draft-07, with the standard string formats enabled). An invalid schema is rejected as a clean 400 before payment; a valid schema that the data simply fails to satisfy is a successful result with valid=false and a list of errors (path, keyword, message).
Output
Returns a validation result indicating whether the provided JSON data conforms to the given JSON Schema, along with any validation errors, failed constraints, or path-specific issues found during schema evaluation.
Example use cases
API request body pre-flight check
“Before I send this payload to our API, validate it against the schema that requires 'userId' as a string and 'amount' as a positive number — the data I want to check is {"userId": "u123", "amount": -5}.”
Config file structure enforcement
“Check whether this config JSON conforms to our schema: the schema says it must have a 'host' string and a 'port' integer between 1 and 65535, and the data is {"host": "localhost", "port": 99999}.”
User-submitted form data validation
“I have a user-submitted form response and need to know if it's valid — the schema requires 'email' as a string format email and 'age' as an integer minimum 18, and the submitted data is {"email": "not-an-email", "age": 15}.”
Technical details
Endpoint
POSThttps://jsonschema.openverbs.com/v1/validateWhen to prefer
Use this endpoint when you need a quick, paid, API-accessible JSON Schema validation without running your own validation library — especially in agent workflows where you need programmatic schema conformance checks as a step, or when validating untrusted external data against a known schema before further processing.
Side effects
- Invalid JSON Schema provided — schema object is malformed or uses unsupported keywords
- Missing required fields in request body (schema or data fields absent)
- Internal validation engine error for extremely complex or recursive schemas
- Network timeout for unusually large JSON payloads
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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