# 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/malformed-json-healer?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-498a5b96
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PdxXJ__5pc89W-AcDC4Di

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-498a5b96 -d '<json body>'
```

Example prompt: This JSON string I got back from the LLM is broken — it has trailing commas and markdown fences around it. Can you repair it so it's valid JSON I can actually use? Here it is: ```{"name": "Alice", "age": 30,}```

## When to prefer this

Choose this endpoint when your multi-agent pipeline receives LLM-generated JSON that fails standard parsers due to common LLM formatting errors like trailing commas, markdown code fences, single quotes, or truncation. Ideal as a middleware step between LLM output and any downstream JSON consumer. Prefer over custom repair logic when you need a deterministic, pay-per-call solution without maintaining your own JSON healing code.

## Known failure modes

- Input is so severely corrupted that deterministic repair is impossible — returns error with reason
- Non-JSON content passed (e.g. plain prose) — cannot be repaired
- Idempotency-Key collision with differing input — may return cached prior result
- Payment failure via x402 — HTTP 402 response before processing occurs
- Input exceeds size limits — returns 4xx with size constraint message

## 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/malformed-json-healer)

## Output

A JSON object containing the repaired, schema-valid version of the input malformed JSON string, suitable for direct consumption by downstream agents or parsers without further sanitization.

## 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-498a5b96/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)