> For the complete documentation index, see [llms.txt](https://axon-finance.gitbook.io/axon-finance-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://axon-finance.gitbook.io/axon-finance-docs/part-iii-ji-shu-jia-gou/part3-architecture/3-2-layered-architecture.md).

# 3.2 五层架构总览

AXON 的地基被组织为五个层次。理解这五层最好的方式，是跟随**一笔支付**自上而下地走一遍——它从接入层进入，经排序层定序，在结算层完成，落到 L1 状态，并由最底层的链上原语支撑整个系统的运转。

## 全景图

```mermaid
flowchart TB
    subgraph L1G["① 接入 / 合规网关"]
        direction LR
        A1["Auth 认证"] --- A2["KYC/AML 可插拔"] --- A3["风控预审"] --- A4["地理围栏"] --- A5["限流"] --- A6["Paymaster 费用代付"]
    end
    subgraph L2["② 排序 / Entry-Log"]
        direction LR
        B1["全局单调 seqNo<br/>公平排队"] --- B2["预写日志<br/>可重放 · 可审计"] --- B3["支付确定性"]
    end
    subgraph L3["③ 结算 + 货币市场 + 风险"]
        direction LR
        C1["稳定币结算引擎"] --- C2["PayFi 货币市场 / 信贷"] --- C3["法币锚定多源喂价"] --- C4["风险准备金"]
    end
    subgraph L4["④ L1 结算层"]
        direction LR
        D1["余额 / 账本"] --- D2["原生 Gas 计费"] --- D3["高吞吐 PoS<br/>亚秒最终性"] --- D4["可证明状态根"]
    end
    subgraph L5["⑤ 链上原语 + AI"]
        direction LR
        E1["Staking / 委托"] --- E2["Treasury / 治理"] --- E3["账户抽象 / 会话密钥"] --- E4["可验证策略沙盒"]
    end
    L1G --> L2 --> L3 --> L4 --> L5
    style L4 fill:#f5541c,stroke:#0a0908,color:#fff
    style L1G fill:#0a0908,stroke:#f5541c,color:#fff
    style L2 fill:#0a0908,stroke:#f5541c,color:#fff
    style L3 fill:#0a0908,stroke:#f5541c,color:#fff
    style L5 fill:#0a0908,stroke:#f5541c,color:#fff
```

## 逐层职责

| 层                    | 职责                                                                |
| -------------------- | ----------------------------------------------------------------- |
| **① 接入 / 合规网关**      | Auth · KYC/AML 可插拔 · 风控预审 · 地理围栏 · 限流 · Paymaster 费用代付            |
| **② 排序 / Entry-Log** | 全局单调 seqNo 公平排队 · 预写日志（可重放、可审计）· 支付确定性                            |
| **③ 结算 + 货币市场 + 风险** | 稳定币结算引擎 · PayFi 货币市场 / 信贷 · 法币锚定多源喂价 · 风险准备金                      |
| **④ L1 结算层**         | 余额 / 账本 · 原生 Gas · 高吞吐 PoS 与亚秒最终性 · 可证明状态根                        |
| **⑤ 链上原语 + AI**      | Staking / 委托 · Treasury · 治理（费率 / 支付 / 信贷）· 账户抽象 / 会话密钥 / 可验证策略沙盒 |

各层要点：

* **① 接入 / 合规网关** 是支付进入系统的第一道门。它把认证、合规、风控、限流、费用代付都放在入口统一处理——让合规成为地基能力而非应用补丁（详见 [3.6](/axon-finance-docs/part-iii-ji-shu-jia-gou/part3-architecture/3-6-compliance-gateway.md)）。
* **② 排序 / Entry-Log** 是支付确定性的核心。它给每一笔交易分配全局单调递增的序号（seqNo），公平排队，并写入可完整重放的预写日志——这是「出错时一定能查清、能恢复」的技术基础（详见 [3.4](/axon-finance-docs/part-iii-ji-shu-jia-gou/part3-architecture/3-4-payment-finality.md)）。
* **③ 结算 + 货币市场 + 风险** 是 PayFi 业务的引擎所在。稳定币结算、货币市场 / 信贷、多源喂价与风险准备金都在这一层（详见 [Part IV](/axon-finance-docs/part-iv-payfi-yin-qing/part4-payfi.md) 与 [3.5](/axon-finance-docs/part-iii-ji-shu-jia-gou/part3-architecture/3-5-oracle-safety.md)）。
* **④ L1 结算层**（图中高亮）是整条链的心脏：账本、原生 gas 计费、高吞吐 PoS 共识与亚秒最终性、可证明的状态根（详见 [3.3](/axon-finance-docs/part-iii-ji-shu-jia-gou/part3-architecture/3-3-consensus-finality.md)）。
* **⑤ 链上原语 + AI** 提供支撑整个系统的底层能力：质押与委托、金库与治理、以及最关键的 AI 原语——账户抽象、会话密钥、可验证策略沙盒（详见 [3.7](/axon-finance-docs/part-iii-ji-shu-jia-gou/part3-architecture/3-7-account-abstraction.md) 与 [Part V](/axon-finance-docs/partv-ai-yuan-sheng/part5-ai.md)）。

## 一笔支付的时序旅程

把五层「竖着」的结构，换成「横着」的时序，就是一笔稳定币支付的完整生命线：

```mermaid
sequenceDiagram
    autonumber
    participant U as 付款方（人 / AI 代理）
    participant G as ① 合规网关
    participant S as ② 排序 / Entry-Log
    participant E as ③ 结算引擎
    participant L as ④ L1 结算层
    U->>G: 发起支付（可由 Paymaster 代付 gas）
    G->>G: 认证 · KYC / 风控 / 地理围栏检查
    G->>S: 通过 → 提交交易
    S->>S: 分配全局 seqNo · 写预写日志
    S->>E: 按序交付结算
    E->>E: 校验余额 · 稳定币结算 · 喂价 / 风控
    E->>L: 提交状态变更
    L->>L: 共识确认 · 亚秒最终性 · 生成可证明状态根
    L-->>U: 支付最终确定（不可双花 · 可追溯）
```

这条时序线揭示了 AXON 设计的核心思想：**支付的每一个环节都被显式建模、显式定序、显式记录。** 没有「大概率成功」的模糊地带——从进入网关到最终确定，每一步都可验证、可审计、可恢复。这就是「把确定性做进地基」的具体含义。

***

*延伸阅读：*[*3.3 共识、亚秒最终性与性能目标*](/axon-finance-docs/part-iii-ji-shu-jia-gou/part3-architecture/3-3-consensus-finality.md) *·* [*3.4 支付最终性与反双花*](/axon-finance-docs/part-iii-ji-shu-jia-gou/part3-architecture/3-4-payment-finality.md)


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