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Agent Payload Tools – JSON Validate
x402
Agent Payload Tools – JSON Validate is a paid API for AI agents from api.agent-payload-tools.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Validates a JSON value against a compact schema definition and returns whether the value conforms
Price / call$0.001
Success—
StatusUnknown
How this service works
Validate a JSON value against the supported compact schema subset.
Output
Returns whether the provided JSON value conforms to the supplied compact validation schema, along with any validation errors or constraint violations identified.
Example use cases
API response schema guard
“Before I pass this API response downstream, validate it against my schema — the value is {"id":"abc123","status":"active","count":5} and the schema should require id and status to be strings and count to be a number.”
AI tool output verification
“My AI tool just returned this JSON: {"result":"success","items":[1,2,3]} — can you check it against a schema that expects result to be a string and items to be an array?”
User-submitted data validation
“A user submitted this JSON form payload: {"email":"test@example.com","age":25} — validate it against a schema that requires email to be a string and age to be an integer greater than zero.”
Technical details
Endpoint
POSThttps://api.agent-payload-tools.workers.dev/json-validateWhen to prefer
Choose this endpoint when you need a deterministic, schema-driven JSON validation step inside an AI agent pipeline without standing up your own validation infrastructure. Particularly useful when you want to guard against malformed tool outputs or user-submitted payloads before passing them to downstream services, and you are already operating in the x402 micropayment ecosystem on Base or Solana.
Side effects
- Malformed JSON value causes a parse error
- Schema definition uses unsupported keywords and is rejected
- Missing required fields in the request body returns a 400 error
- Value is valid JSON but schema is not an object, causing schema parse failure
- Payment not included or insufficient USDC causes a 402 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| value | — | JSON value to validate. |
| schema | object | Supported compact validation schema. |
Tags
x402
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