# Deterministic A2A Broken-JSON Repair & Schema Validator

> Deterministic A2A Broken-JSON Repair & Schema Validator is a paid API for AI agents from defi-yield.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) into valid, parseable JSON for use in multi-agent pipelines

## Facts

- Endpoint: GET https://defi-yield.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: defi-yield.agentdiet.dev
- Website: https://defi-yield.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/defi-yield-agentdiet-dev-deterministic-a2a-broken-json-repair-schema-ceac33df
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vFdL9PnwUUN6CZkj59KzR

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 defi-yield-agentdiet-dev-deterministic-a2a-broken-json-repair-schema-ceac33df
```

Example prompt: This JSON output from my LLM is broken — it has trailing commas, markdown fences, and single quotes — can you repair it into valid parseable JSON? Here's the raw string: ```{name: 'Alice', score: 42,}```

## When to prefer this

Choose this endpoint when your multi-agent or LLM pipeline produces JSON outputs that fail to parse due to common LLM formatting errors like trailing commas, markdown code fences, single quotes, or truncation. Ideal for deterministic (non-probabilistic) repair rather than asking another LLM to rewrite the JSON, which may alter values. Best suited for automated pipelines where reliability and consistency matter more than creative reinterpretation.

## Known failure modes

- Input JSON is so severely malformed it cannot be deterministically repaired — returns error
- Empty raw_json parameter — returns validation error
- Input is not JSON at all (e.g. plain prose) — may return an error or unexpected output
- Payment failure via x402 — returns HTTP 402 before processing
- Network timeout for very large JSON inputs

## 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://defi-yield.agentdiet.dev/v1/llm-json-schema-healer)

## Output

A repaired, valid JSON object that has had common LLM output issues corrected — including trailing commas removed, markdown fences stripped, single quotes converted to double quotes, and truncated structures closed — returned as a parseable JSON response.

## 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/defi-yield-agentdiet-dev-deterministic-a2a-broken-json-repair-schema-ceac33df/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from defi-yield.agentdiet.dev](https://www.zero.xyz/host/defi-yield.agentdiet.dev/llms.txt)