Instant JSON schema verifier

Machine-to-Machine Conformance API · instant-json-schema-verifier

$0.005 / call 3 free calls/day No signup

Validate JSON data payloads against schema definitions. Preflighted for agent tool call pipelines.

Honest Scope Guarantee

Deterministic JSON Schema validation, entirely offline. Only proves conformance of the payload you supply to the schema you supply.

Run in Playground (Free) Buy Card Credits Agent Quickstart

Quickstart & Execution

cURL (20 Free Calls/Day • Zero Authentication Required)

curl -X POST https://api.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 API key needed for the free daily tier. When daily quota exhausts, the endpoint replies with HTTP 402 Payment Required specifying the exact USDC amount. Machines sign an EIP-3009 transfer on Base L2; human engineers buy card credits. Every paid execution returns a cryptographically signed XDR-1 receipt for zero-knowledge audit trails.

Input Parameters

Field	Type	Meaning & Constraints
`data` (REQUIRED)	`object`	The JSON data object to validate against the schema.
`schema` (REQUIRED)	`object`	The JSON schema object with expected properties and types.

Response Format

Deterministic JSON payload fields: valid, errors, execution_ms. Paid responses also carry an offline-verifiable receipt object (XDR-1, secp256k1 signature recoverable to the authorized signer).

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