> For the complete documentation index, see [llms.txt](https://docs.butternetwork.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.butternetwork.io/butter-swap-integration/butter-api-for-routing/get-swap.md).

# GET /swap

GET generated swap transaction calldata to swap in Butter router

### Request Parameters

| Name       | Location | Type   | Required | Description                                                                                                                                                        |
| ---------- | -------- | ------ | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| hash       | query    | string | yes      | the route hash returned by /route                                                                                                                                  |
| slippage   | query    | string | yes      | slippage of swap, a integer in rang \[0, 5000], e.g, 100 means 1%. For cross chain swap, the min slippage is 150， for cross chain from/to TON, min slippage is 300 |
| from       | query    | string | yes      | sender address on source chain                                                                                                                                     |
| receiver   | query    | string | yes      | receiver address on destination chain                                                                                                                              |
| callData   | query    | string | no       | encoded call data if receiver is a contract                                                                                                                        |
| swapCaller | query    | string | no       | swap caller address, e.g., the smart contract address who calls butter rotuer, or the user account who directly calls butter router                                |

> **Authentication**: this endpoint supports API Key authentication. See [Integration Guide - Authentication](/butter-swap-integration/integration-guide.md#authentication) for details.

### Request Example

```bash
GET /swap?hash=0x286081342b93d276381a8cf4b43990e3a522fb25d0c50c3467dce7ff4543c92c&slippage=100&from=0x2D4C407BBe49438ED859fe965b140dcF1aaB71a9&receiver=0x2D4C407BBe49438ED859fe965b140dcF1aaB71a9
```

### Responses Structure

The response contains the following fields:

| Field   | Type   | Description                                                                                                      |
| ------- | ------ | ---------------------------------------------------------------------------------------------------------------- |
| errno   | number | Error code. `0` means success, other values indicate errors, see [error code list](#errors).                     |
| message | string | Response message. If the request was successful it is `success`, otherwise it gives corresponding error message. |
| data    | array  | Contains data on the swap transaction details.                                                                   |

### `data` Field

The `data` field contains an array with one or more transactions data on source blockchain. Each item has the following fields:

| Field   | Type    | Description                                                                                                                           |
| ------- | ------- | ------------------------------------------------------------------------------------------------------------------------------------- |
| to      | string  | The account address which the user interacts with on source chain.                                                                    |
| value   | string  | The native token amount to be transferred to the 'to' address.                                                                        |
| chainId | string  | Source chain Id.                                                                                                                      |
| data    | string  | The encoded transaction data. This field is optional for some blockchains. This field is empty for some blockchains(such as Bitcoin). |
| method  | string  | The contract method the user calls. This field is empty for some blockchains(such as Bitcoin).                                        |
| args    | array?  | The detailed arguments information of the method, including type and value.                                                           |
| memo    | string? | The message that must be included in OP\_RETURN field of Bitcoin transaction.                                                         |

#### Response Examples

1. get swap transaction calldata successfully

> 200 Response

```json
{
  "errno": 0,
  "message": "success",
  "data": [
    {
      "to": "0xEE030ec6F4307411607E55aCD08e628Ae6655B86",
      "data": "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",
      "value": "0x0de0b6b3a7640000",
      "chainId": "1",
      "method": "swapAndBridge",
      "args": [
        {
          "type": "bytes32",
          "value": "0x0000000000000000000000000000000000000000000000000000000000000000"
        },
        {
          "type": "address",
          "value": "0x2D4C407BBe49438ED859fe965b140dcF1aaB71a9"
        },
        {
          "type": "address",
          "value": "0x0000000000000000000000000000000000000000"
        },
        {
          "type": "uint256",
          "value": "1000000000000000000"
        },
        {
          "type": "bytes",
          "value": "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"
        },
        {
          "type": "bytes",
          "value": "0x000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000380000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c00000000000000000000000000000000000000000000000000000000000000014ff0309a8f2a9d9afe040d990bba4ef3512e3288800000000000000000000000000000000000000000000000000000000000000000000000000000000000007c000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000000000000000000000000000000200aee9ba7040d778922a763ce8a50948d61aff50000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000006e0000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000006c00000000000000000000000000000000000000000000000000000000000000660000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002d4c407bbe49438ed859fe965b140dcf1aab71a90000000000000000000000002d4c407bbe49438ed859fe965b140dcf1aab71a90000000000000000000000000000000000000000000000004380e789051b7c6b00000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000004000000000000000000000000aa301070448385cfaac5913a67b16c4392944a8f000000000000000000000000aa301070448385cfaac5913a67b16c4392944a8f0000000000000000000000000000000000000000000000000dd4b49c140cc00000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000004a00000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000404efa0646500000000000000000000000000000000000000000000000000000000000000200000000000000000000000002170ed0880ac9a755fd29b2688956bd959f933f8000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002d4c407bbe49438ed859fe965b140dcf1aab71a90000000000000000000000000000000000000000000000004380e789051b7c6b00000000000000000000000000000000000000000000000000000000000000c00000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000001a0000000000000000000000000000000000000000000000000000000000000000200000000000000000000000013f4ea83d0bd40e75c8222255bc855a974568dd400000000000000000000000013f4ea83d0bd40e75c8222255bc855a974568dd40000000000000000000000000000000000000000000000000b10907cdcd7000000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000002b2170ed0880ac9a755fd29b2688956bd959f933f80001f4bb4cdb9cbd36b01bd1cbaebf2de08d9173bc095c0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000000000b971ef87ede563556b2ed4b1c0b0019111dd85d2000000000000000000000000b971ef87ede563556b2ed4b1c0b0019111dd85d200000000000000000000000000000000000000000000000002c4241f3735c00000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000002b2170ed0880ac9a755fd29b2688956bd959f933f80001f4bb4cdb9cbd36b01bd1cbaebf2de08d9173bc095c000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
        },
        {
          "type": "bytes",
          "value": "0x"
        },
        {
          "type": "bytes",
          "value": "0x0000000000000000000000000000000000000000000000000000000000000001000000000000000000000000200aee9ba7040d778922a763ce8a50948d61aff50000000000000000000000000000000000000000000000000000000000000000"
        }
      ]
    }
  ]
}
```

2. fail to get swap transaction calldata

> 200 Response

```
{
    "errno": <error code>,
    "message": <detailed error message>
}
```

**Note**: error code can be found in [here](/butter-swap-integration/butter-api-for-routing/error-code-list.md)