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LLM Output Validator & Auto-Repair
x402
LLM Output Validator & Auto-Repair is a paid API for AI agents from api.strale.io, paid per call via x402, $0.054001/call, status unknown (last checked 2026-10-10).
Parses, validates, and auto-repairs raw LLM output JSON against an optional schema, fixing common LLM formatting mistakes algorithmically without any AI.
Price / call$0.054001
Success—
StatusUnknown
How this service works
Validate and auto-repair LLM output. Parse JSON, validate against schema, attempt fixes for common LLM mistakes. Algorithmic — no LLM needed.
Output
Returns a parsed and optionally repaired JSON object, validation status, a list of schema violations if an expected_schema was provided, and a log of any automatic fixes applied to correct common LLM formatting errors.
Example use cases
Example prompt
“Parse and validate this raw LLM output string — it's supposed to be JSON matching my schema — and auto-fix any common mistakes like trailing commas or unquoted keys: '{"name": "Alice", "age": 30,}'”
Technical details
Endpoint
GEThttps://api.strale.io/x402/llm-output-validate?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, deterministic, cost-effective way to validate and repair JSON produced by LLMs without involving another AI model. Ideal for agentic pipelines where LLM-generated structured data must conform to a schema before downstream use. Prefer over LLM-based repair when determinism, speed, and cost matter and the errors are common syntactic LLM mistakes.
Side effects
- LLM output is so malformed it cannot be repaired algorithmically — returns error with details of unparseable content
- expected_schema is invalid JSON Schema — returns schema parse error
- llm_output parameter missing — returns 400 bad request
- Output fails strict_mode validation — returns error with full list of violations and no repaired output
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"llm_output": "{\"name\": \"Alice\", \"age\": 30,}",
"strict_mode": false
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"_meta": {
"payment": {
"method": "x402",
"price_usd": 0.054000000000000006,
"settlement_id": "0xeb0ca06d40cfb02a3f7115cd7078430fe53324ca483e7fe06947a05b199cc5ef"
},
"capability": "llm-output-validate",
"latency_ms": 0,
"provenance": {
"source": "algorithmic",
"fetched_at": "2026-06-16T01:20:35.267Z"
}
},
"valid": true,
"errors": [],
"auto_fixed": true,
"error_count": 0,
"parse_error": null,
"parsed_output": {
"age": 30,
"name": "Alice"
},
"auto_fixed_output": "{\n \"name\": \"Alice\",\n \"age\": 30\n}"
}Tags
x402
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