Schema Gate: a signed acceptance boundary for AI-generated JSON

AI agents are now sending model-generated JSON directly to various components such as APIs, queues, databases, and other agents. However, simply having syntactically valid JSON is not sufficient, as issues like missing fields, unexpected values, or payload violations that violate workflow rules can still cause incorrect production actions.

To address this, Schema Gate was developed to establish a deterministic acceptance boundary between the AI-generated JSON output and the system that consumes it. Schema Gate accepts candidate JSON, a bounded target schema, explicit acceptance criteria, a buyer-generated order ID, an idempotency key, and a commitment hash that ties the request to those rules.

When a valid unpaid request is made, Schema Gate returns a standard x402 v2 payment challenge. Upon settlement, it provides a machine-readable ACCEPT or REJECT decision with a signed ES256 receipt that ties the decision to the order, rules, input, output, price, and settlement. This receipt can be used by downstream workflows to ensure the decision is enforced before proceeding.

Unlike local schema validators, Schema Gate offers an independently signed decision that can be verified by another system. The launch price for Schema Gate is 0.010 USDC per completed signed evaluation on Solana mainnet through x402 v2, and both ACCEPT and REJECT outcomes are charged as the delivered product is the signed evaluation.

The client SDK is publicly available, keeping wallet signing local, and the repository includes a strict five-field acceptance policy, receipt verification, recovery handling, and examples. Schema Gate is currently live in managed cloud infrastructure with production and D1-backed acceptance checks in place. The service is seeking an independent workflow team to run a funded production evaluation and provide feedback on the integration's usefulness or any challenges faced.