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

# Get Max Sendable Amount

> <Note>This content applies to WaaS 1.0 only. We highly recommend that you upgrade to [WaaS 2.0](https://www.cobo.com/developers/v2/guides/overview/introduction).</Note> This endpoint returns the maximum sendable amount and the corresponding transaction fee for a given address. It takes in various parameters such as the coin code, fee rate, to_address, and from_address. The response includes the coin decimal, fee coin, the maximum sendable amount, and the corresponding transaction fee.

#### Request

<ParamField query="coin" type="String" required>coin code</ParamField>
<ParamField query="fee_rate" type="Float" required>gas price (unit: wei) for account model or transaction fees per byte for UTXO model</ParamField>
<ParamField query="to_address" type="String" required>to address</ParamField>

<ParamField query="from_address" type="String">
  Account Model: this parameter is required

  UTXO Model: this parameter is optional, the input will be selected based off the current wallet if the parameter is empty or not passed
</ParamField>

#### Response

<ResponseField name="success" type="bool">request successful or failed</ResponseField>

<ResponseField name="result" type="object">
  <Expandable title="object">
    <ResponseField name="coin" type="String">coin code</ResponseField>
    <ResponseField name="coin_decimal" type="Int">coin decimal precision</ResponseField>
    <ResponseField name="fee_coin" type="String">fee coin code</ResponseField>
    <ResponseField name="fee_decimal" type="Int">fee coin decimal precision</ResponseField>
    <ResponseField name="max_send_value" type="Int">the maximum sendable amount for the given address or current wallet</ResponseField>
    <ResponseField name="fee_per_byte" type="Float">transaction fees per byte for UTXO model</ResponseField>
    <ResponseField name="fee_amount" type="Int">transaction fee for UTXO model</ResponseField>
    <ResponseField name="gas_price" type="Int">gas price for account model</ResponseField>
    <ResponseField name="gas_limit" type="Int">gas limit for account model</ResponseField>
  </Expandable>
</ResponseField>

<RequestExample>
  ```python Python theme={null}
  request(
      "GET",
      "/v1/custody/mpc/get_max_send_amount/",
      {
          "coin": "ETH",
          "fee_rate": 43638776316,
          "to_address": "0x8a73abedb3053b17204b887af6231a8ac35fc2cc",
          "from_address": "0xa09ba917934c2415fbeb785ed5dc8eaf4f694973"
      },
      api_key, api_secret, host
  )
  ```

  ```javascript JavaScript theme={null}
  coboFetch('GET', '/v1/custody/mpc/get_max_send_amount/', {
      "coin": "ETH",
      "fee_rate": 43638776316,
      "to_address": "0x8a73abedb3053b17204b887af6231a8ac35fc2cc",
      "from_address": "0xa09ba917934c2415fbeb785ed5dc8eaf4f694973"
  }, api_key, api_secret, host)
      .then(res => {
          res.json().then((data)=>{
              console.log(JSON.stringify(data, null, 4));
          })
      }).catch(err => {
          console.log(err)
      });
  ```

  ```go Go theme={null}
  Request("GET", "/v1/custody/mpc/get_max_send_amount/", map[string]string{
      "coin": "ETH",
      "fee_rate": 43638776316,
      "to_address": "0x8a73abedb3053b17204b887af6231a8ac35fc2cc",
      "from_address": "0xa09ba917934c2415fbeb785ed5dc8eaf4f694973"
  })
  ```
</RequestExample>

<ResponseExample>
  ```json theme={null}
  {
    "success": true,
    "result": {
      "coin": "ETH",
      "coin_decimal": 18,
      "fee_coin": "ETH",
      "fee_decimal": 18,
      "max_send_value": 841165119243622,
      "fee_per_byte": 0,
      "fee_amount": 0,
      "gas_price": 43638776316,
      "gas_limit": 21000
    }
  }
  ```
</ResponseExample>