Summary
This server validates JSON syntax, checks documents against JSON Schema, and returns structure statistics. It runs as a remote service over SSE and implements x402 micropayments, so you'll pay per validation request. The GitHub repo shows it's built in TypeScript but doesn't include much documentation or examples yet. Reach for this when you need programmatic JSON validation with schema enforcement and don't want to run validation logic locally. The micropayment model means you're trading cost predictability for zero infrastructure setup. If you're validating user input, API responses, or config files at scale, test the pricing model carefully before committing.
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Public tool metadata for what this MCP can expose to an agent.
1 tools
data_validate_jsonUse this when you need to validate JSON syntax or validate JSON data against a JSON Schema. Returns validity status, parse errors, formatted JSON, and structure stats (depth, key count, arrays, total2 params
Use this when you need to validate JSON syntax or validate JSON data against a JSON Schema. Returns validity status, parse errors, formatted JSON, and structure stats (depth, key count, arrays, total
Parameters* required
jsonstringJSON string to validate
schemaobjectOptional JSON Schema to validate against
JSON Validator API
JSON validator with optional JSON Schema validation and structure stats. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.
Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.
Quickstart -- MCP
Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):
{
"mcpServers": {
"json-validator": {
"url": "https://json-validator.api.klymax402.com/mcp"
}
}
}
Quickstart -- HTTP (x402)
curl -X POST "https://json-validator.api.klymax402.com/api/validate" \
-H "Content-Type: application/json" \
-d '{"json":"..."}'
# -> 402 Payment Required, with an x402 payment challenge in the response body
Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.
Tools
| Tool | Method | Path | Price | Description |
|---|---|---|---|---|
data_validate_json | POST | /api/validate | $0.003 | Validate JSON and optionally check against a JSON Schema |
data_validate_json
Use this when you need to validate JSON syntax or validate JSON data against a JSON Schema. Returns validity status, parse errors, formatted JSON, and structure stats (depth, key count, arrays, total size). Do NOT use for password checking — use security_check_password. Do NOT use for hash generation — use crypto_generate_hash. Do NOT use for cron expressions — use util_parse_cron.
Parameters
| Name | Type | Required | Description |
|---|---|---|---|
json | string | yes | JSON string to validate |
schema | object | no | Optional JSON Schema to validate against |
Example agent prompts
- "Validate JSON syntax or validate JSON data against a JSON Schema"
Payment
- Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
- Network: Base L2 (
eip155:8453) - Asset: USDC
- Facilitator: Coinbase CDP (primary), PayAI (fallback)
Part of klymax402
100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.
- Catalog: https://klymax402.com/llms.txt
- Full API reference: https://klymax402.com/llms-full.txt
- Live stats: https://klymax402.com/stats
License
MIT
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Plug Mailtrap into your AI workflow and let it handle the email.
Connect Mailtrap MCP →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →Make coding agent sessions - Searchable, Shareable, Vendor-neutral & Scored.
Try For Free →Your agent targets a perfect 10 Code Health score. Deterministic. Every commit.
Try For Free →Integrate web data into your AI product. One API to scrape website & brand data.
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