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Project x402 SchemaCheck Agent
x402
Project x402 SchemaCheck Agent is a paid API for AI agents from projectx402-production.up.railway.app, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Validates a JSON payload against a provided JSON Schema, with optional repair suggestions and plain-English explanations, requiring a USDC micropayment via x402.
Price / call$0.002
Success—
StatusUnknown
How this service works
Validate JSON against a JSON Schema. Checks LLM and agent output and API request payloads, returning structured errors with error codes, JSONPath locations, and a plain-English summary. Optional automatic repair of invalid payloads.
Output
Returns a JSON object with a boolean 'valid' field, an array of validation errors (empty if valid), a plain-English 'summary' of the result, a 'confidence' score (0-1), and an optional 'suggested_payload' with a repaired version of the input when repair=true was requested.
Example use cases
Example prompt
“Can you validate this JSON payload against my schema and tell me in plain English what's wrong, and also suggest a corrected version? Use normal strictness. Here's the schema: {"type":"object","properties":{"name":{"type":"string"},"age":{"type":"integer"}},"required":["name","age"]} and here's the payload: {"name":"Alice","age":"thirty"}.”
Technical details
Endpoint
POSThttps://projectx402-production.up.railway.app/v1/schema-checkWhen to prefer
Choose this endpoint when you need server-side JSON Schema validation with optional automated repair suggestions and human-readable explanations, especially in agentic pipelines where you want to validate API payloads or data records on-the-fly and can pay per-call micropayments via x402. Prefer it over client-side validators when you want repair suggestions or natural-language error explanations embedded in an automated workflow.
Side effects
- Payment not included or insufficient — x402 payment required ($0.002 USDC); returns 402 with payment details
- Malformed json_schema — returns validation error if the schema itself is not a valid JSON Schema document
- Payload exceeds size limits — large payloads may be rejected
- Missing required fields — if json_schema or payload is absent, returns 400
- Strictness enum mismatch — invalid value for strictness field returns a 400 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| repair | boolean | If true, return a suggested corrected payload. Default: false |
| explain | boolean | If true, include a plain-English summary. Default: true |
| payload | — | The JSON value to validate against the schema |
| strictness | string | Validation strictness. Default: normal |
| json_schema | object | JSON Schema document to validate the payload against |
Output
Schema · Response
{
"type": "json",
"example": {
"valid": true,
"errors": [],
"summary": "Payload is valid against the supplied JSON Schema.",
"confidence": 1,
"suggested_payload": null
}
}Tags
x402
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