# 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) so multi-agent pipelines never crash

## Facts

- Endpoint: GET https://defi-yield.agentdiet.dev/v1/schema-repair?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-4d8f1211
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_I9oW-nYaYSUXH6bBgJWhh

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-4d8f1211
```

Example prompt: This JSON string from the last LLM step has trailing commas and markdown code fences and it keeps crashing my pipeline — can you repair it so I get back valid, parseable JSON? Here it is: ```json {"name": "Alice", "score": 42, } ```

## When to prefer this

Choose this endpoint when your multi-agent pipeline receives malformed JSON from LLM outputs and needs a deterministic, rule-based repair rather than asking the LLM to regenerate. Ideal for production pipelines where retrying an LLM call is expensive or introduces latency, and when the corruption is syntactic (trailing commas, markdown wrapping, single quotes, truncation) rather than semantic. Prefer this over ad-hoc regex or LLM-based repair when you need reproducible, idempotent behavior.

## Known failure modes

- Input JSON too ambiguous or corrupted to deterministically repair — returns error indicating unrecoverable structure
- Empty or null raw_json parameter — returns validation error
- JSON repair results in structurally ambiguous output — multiple valid interpretations possible
- Network or service timeout on large payloads
- HTTP 402 payment required if x402 micropayment not included

## 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/schema-repair)

## Output

Returns a JSON object containing the repaired, validated JSON that was originally malformed. The response includes the cleaned JSON structure with all syntax errors corrected — trailing commas removed, markdown fences stripped, single quotes converted to double quotes, and truncated structures closed — ready for downstream parsing.

## 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-4d8f1211/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)