# 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 malformed, truncated, or improperly formatted JSON strings (trailing commas, markdown fences, single quotes) from LLM outputs so multi-agent pipelines can continue without crashing.

## Facts

- Endpoint: POST https://whale-momentum.agentdiet.dev/v1/json-validator?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-c79b32d8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dCvdo8w4mzOeSHoJikUOy

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-c79b32d8 -d '<json body>'
```

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

## When to prefer this

Choose this endpoint when you have LLM-generated or agent-produced JSON that fails standard parsing due to common formatting issues like trailing commas, markdown wrapping, single quotes, or truncation, and you need a deterministic (not AI-generated) repair rather than asking another LLM to fix it — especially valuable in multi-agent pipelines where JSON parsing failures would cascade.

## Known failure modes

- Input is so severely malformed that deterministic repair cannot recover a valid structure, returning an error response
- JSON truncation is too deep or ambiguous to infer correct closing structure
- Non-JSON content passed (e.g. plain prose) that cannot be coerced into valid JSON
- Network timeout or service unavailability returning a 5xx error
- Payment failure via x402 returning a 402 response

## 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-validator)

## Output

A repaired, valid JSON object that has been cleaned of common LLM formatting errors including trailing commas, markdown fences, single-quoted keys/values, and truncation issues — ready for downstream parsing without errors.

## 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-c79b32d8/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)