Validate JSON payloads against OpenAPI or JSON Schema and get ok, errors, and best-effort repair patches.
validation
openapi
json-schema
+2
|How to pay
Pick whichever fits your workflow — you can switch any time.
Subscribe
Monthly billing
Free
Predictable monthly cost with included usage. Best for steady, high-volume traffic.
- Unlimited tools within plan limits
- One API key, billed once a month
- Cancel any time
Pay-per-call
Agent-native
$0.04 per call
Charge agents in USDC the moment they call a tool. No subscriptions, no signup — pay only for what you use.
- 1 priced tool available
- Settled in USDC on Base
- No account or API key required
Schema Guard checks a JSON payload against a JSON Schema or OpenAPI requestBody and returns a structured result agents can act on: ok, errors[], and best-effort RFC6902 patches[]. Use it before calls, after tool output, or in repair loops so bad payloads fail closed with fix hints instead of silent corruption. Settled in USDC on Base (mainnet).