> ## Documentation Index
> Fetch the complete documentation index at: https://core.anylayer.org/llms.txt
> Use this file to discover all available pages before exploring further.

# HTTP Status Codes

> HTTP status codes used by ZKScore API

## Overview

Standard HTTP status codes used by the ZKScore API.

## Status Codes

| Code | Status                | Description                     |
| ---- | --------------------- | ------------------------------- |
| 200  | OK                    | Request successful              |
| 201  | Created               | Resource created successfully   |
| 400  | Bad Request           | Invalid request parameters      |
| 401  | Unauthorized          | Invalid or missing API key      |
| 403  | Forbidden             | Insufficient permissions        |
| 404  | Not Found             | Resource not found              |
| 429  | Too Many Requests     | Rate limit exceeded             |
| 500  | Internal Server Error | Server error                    |
| 503  | Service Unavailable   | Service temporarily unavailable |

## Related Documentation

* [Error Codes](/reference/error-codes)
* [Error Handling](/guides/error-handling)