# Deterministic A2A Broken-JSON Repair & Schema Validator

> Deterministic A2A Broken-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/malformed-json-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-a2a-broken-json-repair-bf3788e5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mBG9Hsm2myinUgyCrnoEM

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-a2a-broken-json-repair-bf3788e5
```

Example prompt: The JSON my LLM just returned is broken — it has trailing commas and markdown code fences wrapping it. Can you run it through the malformed JSON healer to get back a clean, parseable object? Here's the raw string: ```{"name": "Alice", "age": 30,}```

## When to prefer this

Choose this endpoint when your multi-agent pipeline receives malformed, truncated, or markdown-wrapped JSON from an LLM and needs a deterministic, rule-based fix rather than an AI-based rewrite. Ideal for production pipelines where consistency and predictability matter more than creative reconstruction. Prefer this over prompt-engineering retries when you need a fast, cheap ($0.002/call) synchronous repair step that won't alter semantics.

## Known failure modes

- Input JSON is so severely corrupted that deterministic repair cannot infer original structure — returns error with explanation
- Input string is not JSON at all (e.g., plain text or HTML) — endpoint may return unparseable result or error
- Extremely long truncated JSON may be ambiguously completable — repaired output may not match original intent
- Network timeout or HTTP 402 payment failure if USDC payment is not properly configured

## 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/malformed-json-healer)

## Output

A repaired, valid JSON object with all malformations corrected — trailing commas removed, markdown fences stripped, single quotes converted to double quotes, and truncated structures closed — ready for safe parsing by downstream agents or systems.

## 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-a2a-broken-json-repair-bf3788e5/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)