Schema Guard

by markmarteneGitHubUpdated Sep 17, 2026

Validate JSON payloads against OpenAPI or JSON Schema and get ok, errors, and best-effort repair patches.

validation
openapi
json-schema
+2
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How to pay

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
Read the integration guide

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).