JSON Schema Validator

Validate a JSON value against a JSON Schema (bounded draft-07-ish subset: type/enum/required/properties/items/min-max/pattern) and list every violation.

Free tier eligible — 500 calls/month with a free key from /pricing; x402 pay-per-call above quota.

Parameters

Parameter	Type	Required	Description
`schema`	object	required	JSON Schema object describing the expected shape
`instance`	object \| array \| string \| number \| boolean \| null	required	The JSON value to validate against schema (any JSON type)

Call it over MCP (JSON-RPC 2.0)

curl -s https://wingmanprotocol.com/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": {"name": "json_schema_validate", "arguments": {"schema": {}, "instance": {}}}}'

Or plain HTTP

curl -s https://wingmanprotocol.com/tools/json_schema_validate \
  -H 'Content-Type: application/json' \
  -d '{"schema": {}, "instance": {}}'

Try it live

Edit the JSON and run it — this POSTs to https://wingmanprotocol.com/tools/json_schema_validate from your browser.

This tool is x402-metered — agents pay per call with USDC on Base. The 402 response below is the standard x402 payment-requirements envelope: sign the EIP-3009 authorization and retry with the X-Payment header, or get a free key at /pricing (500 calls/month, no card, no crypto).