# 获取已签名交易

## 选项 1：使用钱包私钥自行编写函数生成签名交易。 

在第一步之后，您将获得一个`estimate_trx` ，这是购买订单的成本。然后，您将使用`transactionBuilder` 创建一个转账交易，转账金额等于`estimate_trx` ，从买方地址转移到Tronsave市场的资金中：

```javascript
const dataSendTrx = await tronWeb.transactionBuilder.sendTrx('TRONSAVE_FUND_ADDRESS', estimate_trx, 'BUYER_ADDRESS') 
const signed_tx = await tronWeb.trx.sign(dataSendTrx, 'PRIVATE_KEY');
```

{% hint style="info" %} <mark style="color:blue;">`BUYER_ADDRESS`</mark> 是买方的公共地址。&#x20;

<mark style="color:blue;">`PRIVATE_KEY`</mark> 是买方的私钥。&#x20;

<mark style="color:blue;">`TRONSAVE_FUND_ADDRESS`</mark> 是我们在主网上的 Tronsave 基金地址。&#x20;
{% endhint %}

我们的 Tronsave 基金地址是 (<mark style="color:blue;">`TRONSAVE_FUND_ADDRESS`</mark> ):&#x20;

{% tabs %}
{% tab title="MAINNET" %}

```java
TWZEhq5JuUVvGtutNgnRBATbF8BnHGyn4S
```

{% endtab %}

{% tab title="Nile (For testing)" %}
⚠️ *该资金地址仅用于 TRON Nile 测试网测试用途。*

```
TATT1UzHRikft98bRFqApFTsaSw73ycfoS
```

{% endtab %}
{% endtabs %}

## 选项 2：使用Tronsave的Get Signed Transaction API自动生成签名交易。

### [Buy API (Postman) ](https://www.postman.com/tronsave/tronsave/request/9katmpn/2-tronwebsigntx)

<mark style="color:orange;">`POST`</mark>` ``https://api.tronsave.io/v0/signed-tx`

速率限制 (Rate limit): 每1秒15个请求。

**Request params**

<table><thead><tr><th width="174.33333333333331">域</th><th width="83">地点</th><th width="102">类型</th><th width="79">必需</th><th>描述</th></tr></thead><tbody><tr><td>address</td><td>body</td><td>string</td><td>true</td><td>买方的公共地址</td></tr><tr><td>private_key</td><td>body</td><td>string</td><td>false</td><td>买方的私钥</td></tr><tr><td>estimate_trx</td><td>body</td><td>number</td><td>false</td><td>支付的TRX金额以SUN计算。（<a href="/pages/vF28bHwazVtLPVbbA2nq">第1步中的estimate_trx</a>）</td></tr></tbody></table>

**Request params example**

```java
{ 
"address": "TM6ZeEgpefyGWeMLuzSbfqTGkPv8Z65432", 
"private_key": "{{yourprivateKey}}", 
"estimate_trx": 13500000 //from Step1 
}
```

&#x20;**Responses**

```java
"visible": false,
            "txID": "446eed36e31249b98b201db2e81a3825b185f1a3d8b2fea348b24fc021e58e0d",
            "raw_data": {
                "contract": [
                {
                    "parameter": {
                    "value": {
                        "amount": 13500000,
                        "owner_address": "417a0d868d1418c9038584af1252f85d486502eec0",
                        "to_address": "41055756f33f419278d9ea059bd2b21120e6add748"
                    },
                    "type_url": "type.googleapis.com/protocol.TransferContract"
                    },
                    "type": "TransferContract"
                }
                ],
                "ref_block_bytes": "0713",
                "ref_block_hash": "6c5f7686f4176139",
                "expiration": 1691465106000,
                "timestamp": 1691465046758
            },
            "raw_data_hex": "0a02071322086c5f7686f417613940d084b5999d315a68080112640a2d747970652e676f6f676c65617069732e636f6d2f70726f746f636f6c2e5472616e73666572436f6e747261637412330a15417a0d868d1418c9038584af1252f85d486502eec0121541055756f33f419278d9ea059bd2b21120e6add74818e0fcb70670e6b5b1999d31",
            "signature": ["xxxxxxxxx"]
            }
        }
```


---

# Agent Instructions: Querying This Documentation

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```
GET https://docs.tronsave.io/chinese/developer/rest-api-v0/buy-on-rest-api/use-signed-transaction/get-signed-transaction.md?ask=<question>
```

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