# Page Not Found

The URL `dxchain-3.0-litepaper/4.-dxchain-design-principles-and-architecture/4.4-api-layer` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [4.4 API Layer](https://dxchain.gitbook.io/dxchain-wiki/the-basics/dxchain-v3-litepaper/4.-dxchain-design-principles-and-architecture/4.4-api-layer.md)
- [4.7 MPT + LevelDB](https://dxchain.gitbook.io/dxchain-wiki/the-basics/dxchain-v3-litepaper/4.-dxchain-design-principles-and-architecture/4.7-mpt-+-leveldb.md)
- [4.5 Blacklist Management](https://dxchain.gitbook.io/dxchain-wiki/the-basics/dxchain-v3-litepaper/4.-dxchain-design-principles-and-architecture/4.5-blacklist-management.md)
- [4.3 Cross Chain](https://dxchain.gitbook.io/dxchain-wiki/the-basics/dxchain-v3-litepaper/4.-dxchain-design-principles-and-architecture/4.3-cross-chain.md)
- [4.6 P2P Decentralized Network Layer](https://dxchain.gitbook.io/dxchain-wiki/the-basics/dxchain-v3-litepaper/4.-dxchain-design-principles-and-architecture/4.6-p2p-decentralized-network-layer.md)

## How to find the correct page

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### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://dxchain.gitbook.io/dxchain-wiki/the-basics/dxchain-v3-litepaper/4.-dxchain-design-principles-and-architecture/4.4-api-layer.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

### Option 2 — Browse the documentation index

Full index: https://dxchain.gitbook.io/dxchain-wiki/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://dxchain.gitbook.io/dxchain-wiki/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/dxchain-wiki/the-basics/dxchain-v3-litepaper/4.-dxchain-design-principles-and-architecture/4.4-api-layer.md`).

You may also use `Accept: text/markdown` header for content negotiation.