# FastX402 HTTP Status Code Explainer

> FastX402 HTTP Status Code Explainer is a paid API for AI agents from fastx402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-30).

Returns the standard phrase, class, and plain-English meaning for any three-digit HTTP status code

## Facts

- Endpoint: GET https://fastx402.tools/http-status-explain?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fastx402-http-status-code-explainer-61ff6b5a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_23kZrBGCBOf6BflBxrKAj

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 fastx402-http-status-code-explainer-61ff6b5a
```

Example prompt: What does HTTP status code 429 mean — give me the official phrase, class, and a plain-English explanation of what it indicates.

## When to prefer this

Use this endpoint when an agent needs a structured, machine-readable explanation of an HTTP status code, including its class and official phrase, for surfacing to users, populating documentation, or enriching error-handling logic. Ideal for pay-per-call usage without needing API keys or accounts.

## Known failure modes

- Invalid or non-existent status code returns an error or empty response
- Missing required 'status' query parameter causes a 400-level error
- Non-numeric status string may be rejected
- Payment failure (insufficient USDC balance) blocks the request via x402 protocol

## How this service works

200 pay-per-call tools for AI agents, from $0.001 per request in USDC on Base or Solana with x402. No account, no API key.

## Output

A JSON object containing the numeric status code, its official short phrase (e.g. 'Not Found'), its class (e.g. 'Client Error'), and a plain-English sentence explaining what the status code means.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "status"
     ],
     "properties": {
      "status": {
       "type": "string",
       "description": "Three-digit HTTP status code, such as 404"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "class": {
       "type": "string"
      },
      "phrase": {
       "type": "string"
      },
      "status": {
       "type": "integer"
      },
      "meaning": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "class": "Client Error",
  "phrase": "Not Found",
  "status": 404,
  "meaning": "The requested resource could not be found."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fastx402-http-status-code-explainer-61ff6b5a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fastx402.tools](https://www.zero.xyz/host/fastx402.tools/llms.txt)