# Gas 与成本

## 单项操作的估算 Gas

基于 EVM gas primitives 与 FBA CLOB feasibility report。**这些是估算值，实际 benchmarks 会于 BSC 主网上测量。**

| Operation                   | Gas (Low) | Gas (Typical) | Gas (High) |
| --------------------------- | --------- | ------------- | ---------- |
| Place order                 | 180k      | 250k          | 450k       |
| Cancel order                | 60k       | 100k          | 180k       |
| Clear batch (atomic settle) | 1.0M      | 2.0M          | 4.0M       |
| Pyth verify (1 feed)        | 200k      | 300k          | 600k       |
| Create market               | \~440k    | \~440k        | \~440k     |

## 美元成本 (BSC)

按 BNB ≈ $628 计算，不同 gas price 场景下：

| Action               | @ 0.05 gwei | @ 0.2 gwei | @ 1.0 gwei |
| -------------------- | ----------- | ---------- | ---------- |
| Place order          | $0.008      | $0.031     | $0.157     |
| Cancel order         | $0.003      | $0.013     | $0.063     |
| Clear batch (atomic) | $0.063      | $0.251     | $1.257     |
| Resolve market       | $0.009      | $0.038     | $0.189     |

BSC 2026 年的 gas price（约 0.05 gwei）让用户的所有操作成本低于 1 美分，也让 keeper 操作成本低于 5 美分。

## 成本驱动因素

### Storage Writes

* `SSTORE_SET`（0→nonzero）：20,000 gas，用于创建新订单
* `SSTORE_RESET`（nonzero→nonzero）：5,000 gas，用于更新已有值
* Segment tree updates：约 7 层 × 5,000 gas = 每次 update 约 35,000 gas

### Pyth Verification

* Wormhole attestation verification 的成本随 guardian count 线性增长
* Signed update payloads 的 calldata：每个非零字节 16 gas（EIP-2028）
* `resolveMarket()` 中最大的单项 Gas 组成部分

### Batch Clearing（原子化结算）

* Segment tree traversal：O(log 99) ≈ 7 次迭代
* Result storage：写入一个 struct
* Per-order settlement：unlock、transfer fees、mint tokens、refund excess
* 随订单数量线性增长，并受 MAX\_ORDERS\_PER\_BATCH (1600) 限制
* 结算通过每次 `clearBatch` 调用 SETTLE\_CHUNK\_SIZE = 400 分块执行

## 优化目标

| Metric      | Target | Rationale                  |
| ----------- | ------ | -------------------------- |
| Place order | < 250k | 保持在报告的 typical estimate 以内 |
| Clear batch | < 4.0M | 确保 keeper 成本仍然可行（包括原子化结算）  |

Phase 4 的 optimization pass 会 benchmark 真实 Gas 用量，并根据需要调整 struct packing、storage layout 与 tree implementation。


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.strike.pm/zh/ji-shu/gas-and-costs.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.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.