# whatchuneed Code Explain

> whatchuneed Code Explain is a paid API for AI agents from whatchuneed.vercel.app, paid per call via x402, $0.2/call, status unknown (last checked 2026-09-14).

Analyzes a code snippet alongside its output and explains what the code does, why it produces that output, and offers improvement suggestions.

## Facts

- Endpoint: POST https://whatchuneed.vercel.app/api/code/explain
- Price: $0.2/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/whatchuneed-code-explain-e56ee2ef
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Y5Idcd820aYbJjBIfmNMh

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 whatchuneed-code-explain-e56ee2ef -d '<json body>'
```

Example prompt: Can you explain what this Python function does and why it prints `[1, 4, 9, 16]` as output? Here's the code: `result = [x**2 for x in range(1,5)]; print(result)` — I want to understand the logic and any suggestions to improve it.

## When to prefer this

Choose this endpoint when you need to explain code alongside its actual runtime output — particularly useful when debugging, onboarding junior developers, or learning a new language. Prefer this over generic LLM completions when you want a structured response with discrete suggestions and an output breakdown tied to specific code segments, and when pay-per-call pricing via x402 fits your usage pattern.

## Known failure modes

- Missing required fields (code, output, or language) returns a 400 validation error
- Unsupported or misidentified language may produce an inaccurate explanation
- Very large code snippets may hit token or payload size limits
- Payment failure via x402 protocol results in a 402 response before processing
- Ambiguous or non-deterministic output may result in a generic or imprecise explanation

## How this service works

320+ pay-per-call API endpoints across accommodation, LLM, code execution, crypto, medical, finance, and more. One API, one payment. Powered by x402 protocol.

## Output

Returns a natural language explanation of what the submitted code does and why it produces the given output, an array of improvement suggestions, and a structured output breakdown mapping code execution steps to output segments.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "code",
  "output",
  "language"
 ],
 "properties": {
  "code": {
   "type": "string"
  },
  "output": {
   "type": "string"
  },
  "language": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "explanation": {
   "type": "string"
  },
  "suggestions": {
   "type": "array",
   "items": {
    "type": "string"
   }
  },
  "output_breakdown": {
   "type": "array",
   "items": {
    "type": "object"
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/whatchuneed-code-explain-e56ee2ef/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from whatchuneed.vercel.app](https://www.zero.xyz/host/whatchuneed.vercel.app/llms.txt)