code402 / tools / instant-json-schema-verifier

Instant JSON schema verifier — pay-per-call API

$0.000999 per call · 20 free calls/day · no signup · pay with card credits or a signed USDC voucher (x402)

Sub-millisecond edge validation of JSON data payloads against schema definitions. Preflighted for agent tool call pipelines.

Honest scope: Deterministic, offline, explainable — no ML, no scraping. The response's scope field states the exact guarantee.

Try it (first 20 calls/day free)

curl -X POST https://code402.dev/v1/tools/instant-json-schema-verifier/call \
  -H "content-type: application/json" \
  -d '{"data":{"name":"Apex Agent","version":2},"schema":{"required":["name","version"],"properties":{"name":{"type":"string"},"version":{"type":"number"}}}}'

No key needed for the free tier. When the free quota is used up, the API replies HTTP 402 with the exact price — agents sign the x402 voucher and retry; humans buy card credits. Every paid response carries a signed receipt you can verify offline.

Run it in the playground (free)Pay by card — credits, no crypto

Input parameters

FieldTypeMeaning
data (required)objectThe JSON data object to validate against the schema.
schema (required)objectThe JSON schema object with expected properties and types.

Response

Top-level fields: valid, errors, execution_ms. Paid responses also carry a signed XDR-1 receipt.

All code402 tools

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Machine-readable catalog: llms-full.txt · MCP manifest · OpenAPI. Operated by JUANA LIMITED (UK Co. No. 14043409). Non-custodial: USDC settles payer→seller directly on Base.