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Agent Utility Network JSON Validator
x402
Agent Utility Network JSON Validator is a paid API for AI agents from agent-utility-network.frosty-sound-4560.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Validates a JSON string and returns whether it is valid JSON along with the detected value type.
Price / call$0.001
Success—
StatusUnknown
How this service works
Quality-scored paid utility APIs for AI agents over x402 on Base USDC.
Output
Returns a JSON object with a 'result' field containing 'valid' (boolean indicating whether the input is valid JSON) and 'valueType' (a string describing the JSON value type such as 'object', 'array', 'string', 'number', 'boolean', or 'null').
Example use cases
Validate LLM-generated JSON output
“I got this JSON back from another AI model — can you check whether it's actually valid JSON and what kind of value it is? Here it is: '{"status": "ok", "items": [1, 2, 3]}'”
Pre-flight check before API submission
“Before I send this payload to the payment API, verify it's valid JSON: '{"amount": 100, "currency": "USD", "recipient": "bob@example.com"}'”
Debug malformed config file
“I think my config might have a JSON syntax error — can you validate this and tell me if it parses correctly: '{"host": "localhost", "port": 8080, "debug": true'”
Technical details
Endpoint
POSThttps://agent-utility-network.frosty-sound-4560.workers.dev/v1/paid/json-validateWhen to prefer
Use this endpoint when you need a fast, cheap, programmatic confirmation that a string is valid JSON — especially useful for validating outputs from LLMs, user-submitted data, or external API responses before further processing. At $0.001 per call it is cost-effective for high-frequency validation loops inside agent workflows.
Side effects
- Empty input string returns a validation error
- Input exceeding 100,000 characters is rejected
- Payment failure via x402/Base USDC prevents the call from completing
- Network timeout on the Cloudflare Workers edge
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | string |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"valid": true,
"valueType": "object"
}
}
}Tags
x402
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