# Deterministic A2A Broken-JSON Repair & Schema Validator

> Deterministic A2A Broken-JSON Repair & Schema Validator is a paid API for AI agents from onchain-risk.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://onchain-risk.agentdiet.dev/v1/structured-output?utm_source=zero.xyz
- Price: $0.002/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: onchain-risk.agentdiet.dev
- Website: https://onchain-risk.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/onchain-risk-agentdiet-dev-deterministic-a2a-broken-json-repair-ea889051
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UVVpApuNNx82je0-i5t7N

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 onchain-risk-agentdiet-dev-deterministic-a2a-broken-json-repair-ea889051
```

Example prompt: This JSON came back from my LLM with trailing commas and markdown fences and it's breaking my pipeline — can you repair it and give me back valid JSON? Here's the raw string: ```{"name": "Alice", "score": 42,}```

## When to prefer this

Choose this endpoint when an LLM or agent pipeline produces malformed JSON that needs deterministic, rule-based repair rather than AI-based reinterpretation. Ideal when you need predictable, repeatable fixes for known JSON syntax errors like trailing commas, markdown code fences, and single-quoted keys — without the cost or latency of sending the data back to an LLM for re-generation.

## Known failure modes

- Input JSON is too severely malformed or truncated to deterministically repair — returns error
- Empty or null raw_json input — returns validation error
- JSON is structurally ambiguous after truncation — repair may not match original intent
- Payment required (HTTP 402) if x402 payment header is missing or insufficient

## 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://onchain-risk.agentdiet.dev/v1/structured-output)

## Output

A repaired, valid JSON object parsed from the malformed input string, with all syntax errors corrected — 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/onchain-risk-agentdiet-dev-deterministic-a2a-broken-json-repair-ea889051/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from onchain-risk.agentdiet.dev](https://www.zero.xyz/host/onchain-risk.agentdiet.dev/llms.txt)