Schemacheck Agent
@garyedgington
About Schemacheck Agent
SchemaCheck Agent validates JSON payloads against JSON Schema Draft 7 and 2020-12 standards. Designed for agent-to-agent workflows, it returns structured validation results instantly — including field-level error paths, human-readable summaries, and optionally a corrected payload
Config
Add this server to your MCP-compatible client using the configuration below.
{
"mcpServers": {
"schemacheck-agent": {
"url": "https://projectx402-production.up.railway.app/sse"
}
}
}Tools
2Validate a JSON payload against a JSON Schema. Returns whether the payload is valid, a list of structured validation errors, a human-readable summary, and -- when repair=True and the payload is invalid -- a suggested corrected payload. Args: json_schema: A valid JSON Schema object (Draft 2020-12 or Draft-07). payload: The JSON value to validate (object, array, string, number, boolean, or null). strictness: Controls repair aggressiveness. "strict" -- only fill fields that have explicit defaults. "normal" -- fill missing required fields with type defaults. "lenient" -- same as normal (future: may coerce types). repair: When True and the payload is invalid, attempt to produce a suggested_payload that satisfies the schema. explain: When True, include a human-readable explanation in summary. Returns: valid (bool), errors (list), summary (str), suggested_payload (any|null), confidence (float), meta (dict).
Validate a JSON payload against a JSON Schema (free trial, no repair). Identical to validate_schema but repair suggestions are always disabled. Use this for lightweight checks where a corrected payload is not needed. Args: json_schema: A valid JSON Schema object (Draft 2020-12 or Draft-07). payload: The JSON value to validate. explain: When True, include a human-readable explanation in summary. Returns: valid (bool), errors (list), summary (str), suggested_payload (null), confidence (float), meta (dict).
Overview
What is Schemacheck Agent?
Schemacheck Agent is a machine-native paid API that validates JSON payloads against JSON Schema. It returns structured validation results including validity, errors with JSONPath locations, a plain-English summary, and optional corrected payload suggestions. Built for autonomous agents, backend pipelines, and developers who need reliable per-call JSON validation.
How to use Schemacheck Agent?
Connect an MCP-compatible client to https://projectx402-production.up.railway.app/mcp for tool-based usage, or call the REST endpoints directly. The free trial endpoint requires no payment; the paid endpoint uses x402 v2 USDC micropayments of $0.005 per call on Base mainnet. MCP tools available are validate_schema (full, with repair) and validate_schema_trial (free, no repair).
Key features of Schemacheck Agent
- Validates JSON payloads against any JSON Schema
- Returns structured errors with JSONPath locations
- Provides plain-English validation summaries
- Suggests corrected payloads on paid endpoint
- Supports strict, normal, and lenient validation modes
- MCP Streamable HTTP and REST + x402 access modes
Use cases of Schemacheck Agent
- AI agents validating structured outputs against a schema
- Backend pipelines performing per-call JSON validation without library dependencies
- Developers prototyping or debugging JSON Schema compliance
- Automated repair of malformed payloads in data ingestion flows
FAQ from Schemacheck Agent
What access modes does Schemacheck Agent support?
Schemacheck Agent supports MCP tools via Streamable HTTP and REST endpoints with x402 USDC micropayments on Base mainnet.
Is there a free way to try Schemacheck Agent?
Yes, the trial endpoint at POST /v1/schema-check/trial is free but limited to 32KB request bodies and does not include repair functionality.
What is the cost per call for the paid endpoint?
Each paid call costs $0.005 USDC, processed via the x402 v2 micropayment protocol on Base mainnet.
Does Schemacheck Agent require a runtime or library installation?
No. Schemacheck Agent is a remote API — no local library or runtime dependencies are needed beyond an HTTP client or MCP-compatible agent.
What data does Schemacheck Agent return when validation fails?
The response includes an array of errors with path, error code, message, and schema path; a plain-English summary; a confidence score; and optionally a suggested corrected payload.
Frequently asked questions
What access modes does Schemacheck Agent support?
Schemacheck Agent supports MCP tools via Streamable HTTP and REST endpoints with x402 USDC micropayments on Base mainnet.
Is there a free way to try Schemacheck Agent?
Yes, the trial endpoint at `POST /v1/schema-check/trial` is free but limited to 32KB request bodies and does not include repair functionality.
What is the cost per call for the paid endpoint?
Each paid call costs $0.005 USDC, processed via the x402 v2 micropayment protocol on Base mainnet.
Does Schemacheck Agent require a runtime or library installation?
No. Schemacheck Agent is a remote API — no local library or runtime dependencies are needed beyond an HTTP client or MCP-compatible agent.
What data does Schemacheck Agent return when validation fails?
The response includes an array of errors with path, error code, message, and schema path; a plain-English summary; a confidence score; and optionally a suggested corrected payload.
Basic information
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