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Schemacheck Agent MCP Server

@garyedgington

Repository

Basic information

Category

AI & Agents

Transports

stdio

Author

garyedgington

Submitted by

Gary Edgington

About Schemacheck Agent MCP Server

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

#json-schema#validation#json#data-validation#schema#micropayment#x402#usdc#base#agent#api#fastapi#developer-tools#structured-output#repair

Schemacheck Agent MCP Server config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "schemacheck-agent": {
      "url": "https://projectx402-production.up.railway.app/sse"
    }
  }
}

Schemacheck Agent MCP Server tools

2

Validate 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

Frequently asked questions

1

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.

2

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.

3

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.

4

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.

5

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.

Comments

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