DEX API
Approve transactions

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.

Note
The public DEX API is deprecated. To continue using the API service, please visit the Developer Portal to apply for an API key.

Request address#

GET https://www.okx.com/api/v5/dex/aggregator/approve-transaction

Request param#

ParameterTypeRequiredDescription
chainIdStringYesChain ID (e.g., 1 for Ethereum. See Chain IDs)
tokenContractAddressStringYesToken contract address (e.g., 0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48)
approveAmountStringYesThe 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)

Response param#

ParameterTypeDescription
dataStringCall data
dexContractAddressStringThe contract address of OKX DEX approve (e.g., 0x6f9ffea7370310cd0f890dfde5e0e061059dcfd9)
gasLimitStringGas limit (e.g., 50000)
gasPriceStringGas price in wei (e.g., 110000000)

Request example#

shell
curl --location --request GET 'https://www.okx.com/api/v5/dex/aggregator/approve-transaction?chainId=1&tokenContractAddress=0x6f9ffea7370310cd0f890dfde5e0e061059dcfd9&approveAmount=1000000' \
--header 'OK-ACCESS-PROJECT: 86af********d1bc' \
--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": ""
}