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

# POST DEX Approve

> Get approval transaction data for a DEX swap

# POST DEX Approve

## Endpoint

```
POST /dexApprove
```

Returns the approval transaction data needed before executing a DEX swap.

## Request Body

```json theme={null}
{
  "tokenIdTo": "6689b73ec90e45f3b3e51558",
  "tokenIdFrom": "6689b73ec90e45f3b3e51553",
  "addressFrom": "0x45CF73349a4895fabA18c0f51f06D79f0794898D",
  "amount": 1,
  "swap": "sw",
  "route": {
    "duration": 1,
    "gas": "5387746374601800",
    "quote": {
      "integration": "debridge",
      "type": "swap",
      "bridgeFee": "29257969",
      "bridgeFeeInNativeToken": "1000000000000000",
      "amount": "657693444",
      "decimals": 9,
      "amountUSD": "94.905",
      "bridgeFeeUSD": "4.221",
      "bridgeFeeInNativeTokenUSD": "2.434",
      "fees": [
        {
          "type": "bridge",
          "amount": "29257969",
          "amountUSD": "4.221",
          "chainSlug": "solana",
          "tokenSymbol": "SOL",
          "tokenAddress": "11111111111111111111111111111111",
          "decimals": 9,
          "deductedFromSourceToken": true
        },
        {
          "type": "bridge",
          "amount": "1000000000000000",
          "amountUSD": "2.434",
          "chainSlug": "ethereum",
          "tokenSymbol": "ETH",
          "tokenAddress": "0x0000000000000000000000000000000000000000",
          "decimals": 18,
          "deductedFromSourceToken": false
        },
        {
          "type": "gas",
          "amount": "5387746374601800",
          "amountUSD": "13.118",
          "chainSlug": "ethereum",
          "tokenSymbol": "ETH",
          "tokenAddress": "0x0000000000000000000000000000000000000000",
          "decimals": 18,
          "deductedFromSourceToken": false
        },
        {
          "type": "partner",
          "amount": "200000",
          "amountUSD": "0.200",
          "chainSlug": "ethereum",
          "tokenSymbol": "USDT",
          "tokenAddress": "0xdac17f958d2ee523a2206206994597c13d831ec7",
          "decimals": 6,
          "deductedFromSourceToken": true
        }
      ]
    },
    "route": [
      {
        "bridge": "debridge",
        "bridgeTokenAddress": "0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48",
        "steps": ["allowance", "approve", "send"],
        "name": "USDC",
        "part": 100
      }
    ],
    "distribution": { "debridge": 1 },
    "gasUSD": "13.118"
  }
}
```

## Request Fields

| Field         | Type   | Description                                      |
| ------------- | ------ | ------------------------------------------------ |
| `tokenIdTo`   | string | Destination token identifier                     |
| `tokenIdFrom` | string | Source token identifier                          |
| `addressFrom` | string | Address from which the amount will be deducted   |
| `amount`      | number | Approval amount                                  |
| `swap`        | string | Swap type identifier (e.g., `sw`)                |
| `route`       | object | Routing configuration (RouteDTO from `dexQuote`) |

## Example Response

```json theme={null}
[
  {
    "data": "0x095ea7b300000000000000000000000072788af7fc87d14da73f94e353e52b76e230035b000000000000000000000000000000000000000000000000016345785d8a0000",
    "to": "0x0000000000000000000000000000000000000000",
    "from": "0x789",
    "fromChain": {
      "id": "667160411933f7647414f091",
      "created": "2024-06-18T10:24:01.870Z",
      "modified": "2024-09-04T13:41:54.131Z",
      "name": "Ethereum",
      "shortName": "ethereum",
      "addressValidation": "^(0x)[0-9A-Fa-f]{40}$",
      "explorerUrl": "https://etherscan.io/tx/{txHash}",
      "addressUrl": "https://etherscan.io/tokens/{address}",
      "kind": "evm",
      "chainId": 1,
      "block": "0",
      "gasPrice": "0",
      "lastBaseFeePerGas": "0",
      "maxFeePerGas": "0",
      "maxPriorityFeePerGas": "0",
      "enabled": true,
      "icon": "http://localhost:3000/assets/dexchains/667160411933f7647414f091.png"
    }
  }
]
```

## Response Fields

| Field       | Type   | Description                                       |
| ----------- | ------ | ------------------------------------------------- |
| `data`      | string | Encoded transaction data (hex) to submit on-chain |
| `to`        | string | Target contract address                           |
| `from`      | string | Source token address                              |
| `fromChain` | object | Source chain details (ChainDTO)                   |

### ChainDTO Fields

| Field                  | Type    | Description                  |
| ---------------------- | ------- | ---------------------------- |
| `id`                   | string  | Unique chain identifier      |
| `created`              | string  | Creation timestamp           |
| `modified`             | string  | Last modification timestamp  |
| `name`                 | string  | Chain full name              |
| `shortName`            | string  | Chain abbreviation           |
| `addressValidation`    | string  | Regex for address validation |
| `memoNeeded`           | boolean | Whether memo is required     |
| `explorerUrl`          | string  | Block explorer URL format    |
| `addressUrl`           | string  | Token address URL format     |
| `icon`                 | string  | Chain icon URL               |
| `kind`                 | string  | Chain type (e.g., `evm`)     |
| `chainId`              | number  | Blockchain network ID        |
| `block`                | bigint  | Current block number         |
| `gasPrice`             | bigint  | Current gas price            |
| `lastBaseFeePerGas`    | bigint  | Recent base fee              |
| `maxFeePerGas`         | bigint  | Maximum fee ceiling          |
| `maxPriorityFeePerGas` | bigint  | Priority fee limit           |
| `enabled`              | boolean | Whether chain is active      |
| `shortNameV1`          | string  | Legacy chain abbreviation    |