# 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 truncated or malformed LLM-generated JSON (trailing commas, markdown fences, single quotes) 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-8522dd58
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_v2y31fY6jB5XU55ookD2I

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-8522dd58
```

Example prompt: The LLM just returned this messy JSON with trailing commas and markdown fences — can you clean it up and give me a valid JSON object? Here it is: ```json {"name": "Alice", "age": 30,} ```

## When to prefer this

Choose this endpoint when your multi-agent pipeline receives JSON from an LLM that frequently produces malformed output with trailing commas, markdown code fences, single quotes, or truncation errors. It is especially valuable in automated pipelines where crashes are costly and deterministic repair (not AI-based guessing) is required.

## Known failure modes

- JSON too severely truncated to recover any meaningful structure
- Input string contains no JSON-like content at all
- Ambiguous repair cases where multiple valid completions exist
- Rate limiting or payment failure via x402 protocol
- Empty raw_json input returns validation error

## 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, syntactically valid JSON object with common LLM output artifacts removed — including trailing commas, markdown fences, single-quoted keys/values, and truncation artifacts — ready for downstream parsing.

## 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-8522dd58/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)