# 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 2026-10-21).

Repairs truncated or malformed LLM-generated JSON (trailing commas, markdown fences, single quotes) into valid, parseable JSON for multi-agent pipelines.

## Facts

- Endpoint: GET https://whale-momentum.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: 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-79c90814
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VAtYZWGlAXyDZ4F6h7I_T

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-79c90814
```

Example prompt: The LLM returned this broken JSON with trailing commas and markdown code fences — can you repair it into valid, parseable JSON? Here it is: ```json {"name": "Alice", "score": 42, } ```

## When to prefer this

Choose this endpoint when you need deterministic, rule-based JSON repair of LLM outputs rather than probabilistic regeneration. Ideal for multi-agent pipelines where downstream systems require strictly valid JSON and LLM outputs frequently contain markdown fences, trailing commas, or single quotes. Prefer over re-prompting the LLM when you need fast, low-cost, predictable fixes without consuming additional LLM tokens.

## Known failure modes

- Input is so severely malformed or truncated that valid JSON cannot be inferred
- Input contains deeply nested or ambiguous structures that are unresolvable
- Empty or whitespace-only raw_json input returns an error
- Non-JSON input (e.g. plain text, XML) may not be repairable
- Schema validation failures if output does not match expected structure

## 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/structured-output)

## Output

A repaired, valid JSON object reconstructed from the malformed input, with structural issues like trailing commas, markdown code fences, single quotes, and truncation corrected deterministically.

## 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-79c90814/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)