# Deterministic JSON Repair & Schema Validator

> Deterministic 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 JSON outputs (trailing commas, markdown fences, single quotes) so multi-agent pipelines never crash

## Facts

- Endpoint: GET https://polymarket-odds.agentdiet.dev/v1/json-fix?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-json-repair-schema-ea02c706
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uozjvnB52Yq4jeubMtxc7

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-json-repair-schema-ea02c706
```

Example prompt: Can you fix this broken JSON that my LLM just returned — it has trailing commas and is wrapped in markdown fences and keeps crashing my pipeline: ```json {"name": "Alice", "score": 42, } ```

## When to prefer this

Choose this endpoint when your agent pipeline receives JSON output from LLMs that frequently contains common malformations like trailing commas, markdown fences, or single quotes, and you need a deterministic (not generative) fix that won't hallucinate or alter intended values. Prefer this over writing custom regex logic when you need a reliable, hosted microservice for JSON sanitization in production multi-agent workflows.

## Known failure modes

- Input JSON is too severely malformed or ambiguous to deterministically reconstruct — returns error or best-effort partial result
- Input string is not JSON at all (e.g. plain prose) — may return an error or empty object
- Missing required raw_json parameter — returns 400 or validation error
- Payment not completed — returns HTTP 402 requiring x402 micropayment
- Network timeout if upstream service is unavailable

## 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/json-fix)

## Output

A repaired, valid JSON object reconstructed from the malformed input. The response contains the corrected JSON with all common LLM-output issues resolved: trailing commas removed, markdown fences stripped, single quotes converted to double quotes, and truncated structures closed.

## 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-json-repair-schema-ea02c706/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)