Approve Transactions#
According to the ERC-20 standard , we need to make sure that the OKX router has permission to spend funds with the user's wallet before making a transaction. This API will generate the relevant data for calling the contract.
Request URL#
GET https://web3.okx.com/api/v6/dex/aggregator/approve-transaction
Request Parameters#
| Parameter | Type | Required | Description |
|---|---|---|---|
| chainIndex | String | Yes | Unique identifier for the chain. e.g., 1: Ethereum. See more here. |
| tokenContractAddress | String | Yes | Token contract address (e.g., 0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48) |
| approveAmount | String | Yes | The amount of token that needs to be permitted (set in minimal divisible units, e.g., 1.00 USDT set as 1000000, 1.00 DAI set as 1000000000000000000,you could get the minimal divisible units from Token Basic Information.) |
Response Parameters#
| Parameter | Type | Description |
|---|---|---|
| data | String | Call data |
| dexContractAddress | String | The contract address of OKX DEX approver (e.g., 0x6f9ffea7370310cd0f890dfde5e0e061059dcfd9) |
| gasLimit | String | Gas limit (e.g., 50000). To get accurate data, please take a look at /gas-limit API |
| gasPrice | String | Gas price in wei (e.g., 110000000) |
Request Example#
shell
curl --location --request GET 'https://web3.okx.com/api/v6/dex/aggregator/approve-transaction?chainIndex=1&tokenContractAddress=0x6f9ffea7370310cd0f890dfde5e0e061059dcfd9&approveAmount=1000000' \
--header 'OK-ACCESS-KEY: 37c541a1-****-****-****-10fe7a038418' \
--header 'OK-ACCESS-SIGN: leaV********3uw=' \
--header 'OK-ACCESS-PASSPHRASE: 1****6' \
--header 'OK-ACCESS-TIMESTAMP: 2023-10-18T12:21:41.274Z'
Response Example#
200
{
"code": "0",
"data": [
{
"data": "0x095ea7b3000000000000000000000000c67879f4065d3b9fe1c09ee990b891aa8e3a4c2f00000000000000000000000000000000000000000000000000000000000f4240",
"dexContractAddress": "0xc67879F4065d3B9fe1C09EE990B891Aa8E3a4c2f",
"gasLimit": "50000",
"gasPrice": "110000000"
}
],
"msg": ""
}