# Deterministic LLM JSON Repair & Schema Validator

> Deterministic LLM JSON Repair & Schema Validator is a paid API for AI agents from polymarket-odds.agentdiet.dev, paid per call via MPP, $0.002/call, status unknown (last checked 2026-10-21).

Repairs malformed, truncated, or markdown-wrapped LLM JSON outputs (trailing commas, single quotes, markdown fences) to prevent multi-agent pipeline crashes

## Facts

- Endpoint: GET https://polymarket-odds.agentdiet.dev/v1/llm-json-schema-healer?utm_source=zero.xyz
- Price: $0.002/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: polymarket-odds.agentdiet.dev
- Website: https://polymarket-odds.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/polymarket-odds-agentdiet-dev-deterministic-llm-json-repair-schema-239d220d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3KAJea2YIJ8iAk3IS7rT-

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability polymarket-odds-agentdiet-dev-deterministic-llm-json-repair-schema-239d220d
```

Example prompt: This JSON from the LLM has trailing commas and markdown code fences and won't parse — can you run it through the JSON healer to get back a clean, valid object? Here it is: ```json {"name": "Alice", "score": 42, }```

## When to prefer this

Choose this endpoint when your multi-agent pipeline receives LLM-generated JSON that is syntactically broken (trailing commas, markdown fences, single quotes, truncation) and you need a deterministic, rule-based fix rather than asking another LLM to rewrite it. Ideal for production pipelines where reliability and repeatability matter more than creative reinterpretation of ambiguous structure.

## Known failure modes

- Input JSON is so severely malformed that deterministic repair is impossible — returns an error indicating the string is unrecoverable
- Empty or missing raw_json parameter causes a validation error
- Input is not JSON at all (e.g. plain prose) and cannot be coerced into a valid object
- Extremely long or deeply nested JSON may exceed processing limits

## How this service works

Repairs truncated or malformed LLM JSON outputs (trailing commas, markdown fences, single quotes) so multi-agent pipelines never crash. (Live x402 v2, IETF MPP & MCP endpoint at https://polymarket-odds.agentdiet.dev/v1/llm-json-schema-healer)

## Output

A repaired, valid JSON object with all syntax errors corrected — trailing commas removed, markdown fences stripped, single quotes converted to double quotes, and truncated structures closed — ready for immediate use in downstream pipeline steps.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "raw_json"
 ],
 "properties": {
  "raw_json": {
   "type": "string",
   "minLength": 1,
   "description": "Malformed, truncated, or markdown-wrapped JSON string to deterministically repair"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/polymarket-odds-agentdiet-dev-deterministic-llm-json-repair-schema-239d220d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from polymarket-odds.agentdiet.dev](https://www.zero.xyz/host/polymarket-odds.agentdiet.dev/llms.txt)