# Deterministic A2A Broken-JSON Repair & Schema Validator

> Deterministic A2A Broken-JSON Repair & Schema Validator is a paid API for AI agents from whale-momentum.agentdiet.dev, paid per call via MPP, $0.002/call, status unknown (last checked 2026-10-23).

Repairs truncated or malformed LLM JSON outputs (trailing commas, markdown fences, single quotes) so multi-agent pipelines never crash.

## Facts

- Endpoint: POST https://whale-momentum.agentdiet.dev/v1/json-repair?utm_source=zero.xyz
- Price: $0.002/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: whale-momentum.agentdiet.dev
- Website: https://whale-momentum.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/whale-momentum-agentdiet-dev-deterministic-a2a-broken-json-repair-99ffea62
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TkzdNtijZY9HcJJLJUC9q

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 whale-momentum-agentdiet-dev-deterministic-a2a-broken-json-repair-99ffea62 -d '<json body>'
```

Example prompt: This JSON from the LLM has trailing commas and markdown code fences and is breaking my pipeline — can you repair it and give me back valid JSON? Here's the raw output: ```json {"name": "Alice", "age": 30,} ```

## When to prefer this

Choose this endpoint when you need deterministic, rule-based JSON repair rather than LLM-based guessing — ideal for multi-agent pipelines where consistency and predictability matter. Prefer it when dealing specifically with LLM output artifacts like markdown fences, trailing commas, or single quotes. Use it as a reliability layer between LLM calls and downstream JSON parsers to prevent pipeline crashes.

## Known failure modes

- Input is so severely malformed that deterministic repair is ambiguous or impossible
- Empty or whitespace-only raw_json input
- Input is not JSON at all (e.g. plain text or binary data)
- Extremely large payloads may time out
- Schema validation failures if response schema is stricter than repaired output

## 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://whale-momentum.agentdiet.dev/v1/json-repair)

## Output

A repaired, valid JSON object reconstructed from the malformed input. The response includes the corrected JSON with all syntax errors 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/whale-momentum-agentdiet-dev-deterministic-a2a-broken-json-repair-99ffea62/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from whale-momentum.agentdiet.dev](https://www.zero.xyz/host/whale-momentum.agentdiet.dev/llms.txt)