# Saylor Innovations HTTP Status Code Reference

> Saylor Innovations HTTP Status Code Reference is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).

Returns detailed metadata for a given HTTP status code, including its name, class, meaning, retryability, cacheability, related codes, and specification reference.

## Facts

- Endpoint: GET https://saylorinnovations.com/api/dev/http-status?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-http-status-code-reference-fc35cef2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TABnaXEdnnv9FEcxvwabu

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 saylor-innovations-http-status-code-reference-fc35cef2
```

Example prompt: What does HTTP status code 429 mean — is it an error, is it retryable, and is there an RFC that defines it?

## When to prefer this

Use this endpoint when an agent or developer needs authoritative, machine-readable metadata about a specific HTTP status code — including retryability, cacheability, error classification, and spec reference — rather than parsing documentation or relying on heuristics. Ideal for building retry logic, documenting APIs, or explaining unexpected responses to end users.

## Known failure modes

- Missing or invalid 'code' query parameter returns an error response
- Unrecognized or non-standard status codes may return no result or partial data
- Network or upstream API errors return a non-200 HTTP response
- Payment of $0.01 USDC required per call; missing payment returns 402

## How this service works

HTTP status code reference with name, class, meaning, whether it is retryable or cacheable by default and related codes, or list a whole class

## Output

A JSON object containing the numeric code, human-readable name, class (e.g. 4xx Client Error), plain-English meaning, boolean flags for is_error, retryable, is_redirect, and cacheable_by_default, an array of related status codes, the RFC/specification section that defines it, and the data source.

## 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",
    "queryParams"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "POST",
      "PUT",
      "PATCH",
      "DELETE",
      "HEAD"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "code",
      "class"
     ],
     "properties": {
      "code": {
       "type": "string",
       "description": "HTTP status code such as 404, 429, 503"
      },
      "class": {
       "type": "string",
       "description": "or 1xx-5xx to list a class (omit both for all)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "code",
      "name",
      "meaning"
     ],
     "properties": {
      "code": {
       "type": "number",
       "description": "Code assigned by the issuing system"
      },
      "name": {
       "type": "string",
       "description": "Name"
      },
      "class": {
       "type": "string",
       "description": "Class"
      },
      "source": {
       "type": "string",
       "description": "Data source the values come from"
      },
      "meaning": {
       "type": "string",
       "description": "What the status code means and how clients should react"
      },
      "related": {
       "type": "array",
       "description": "Related status codes"
      },
      "is_error": {
       "type": "boolean",
       "description": "True when this is error"
      },
      "retryable": {
       "type": "boolean",
       "description": "True when retrying the request may succeed"
      },
      "specification": {
       "type": "string",
       "description": "RFC section that defines the code"
      },
      "cacheable_by_default": {
       "type": "boolean",
       "description": "Cacheable by default"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-http-status-code-reference-fc35cef2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)