# HTTP Status Code Explainer

> HTTP Status Code Explainer is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.0005/call, status unknown (last checked 2026-09-13).

Returns a human-readable explanation of any HTTP status code (100–599)

## Facts

- Endpoint: POST https://api.fastapi.online/http-status-explain
- Price: $0.0005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/http-status-code-explainer-f36e98c9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8L5oacqTVwQVPALtPSpBb

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 http-status-code-explainer-f36e98c9 -d '<json body>'
```

Example prompt: Can you explain what HTTP status code 422 means?

## When to prefer this

Use this endpoint when an agent or developer tool needs a quick, structured explanation of an HTTP status code without relying on external documentation sites. Ideal for debugging agents, error log interpreters, or educational tools that need on-demand HTTP semantics. Priced per call at $0.0005 USDC with no signup required, making it suitable for lightweight, ad-hoc lookups.

## Known failure modes

- Status code outside 100–599 range returns a validation error
- Malformed request body (non-integer) returns 422 Unprocessable Entity
- Service unavailable returns 5xx from the host itself
- Payment not completed returns 402 Payment Required

## How this service works

Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&amp;A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding &amp; crypto utilities, date/time calculators, geo/coordinate math, math &amp; finance calculators, novelty tools, and business/social writing generators — 179 endpoints in all, across multiple specialized self-hosted models. Pay per call with crypto — no signup — or get an API key.

## Output

A plain-language explanation of the given HTTP status code, including its official name and what it typically indicates in a web/API context.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "status_code": {
   "type": "integer",
   "maximum": 599,
   "minimum": 100
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/http-status-code-explainer-f36e98c9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.fastapi.online](https://www.zero.xyz/host/api.fastapi.online/llms.txt)