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POST
/
prepare-transactions
/
approve
approve
curl --request POST \
  --url https://api.sandbox.brickken.com/prepare-transactions/approve \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "method": "approve",
  "signerAddress": "<string>",
  "chainId": "<string>",
  "tokenSymbol": "<string>",
  "spenderAddress": "<string>",
  "amount": "<string>"
}
'
{
  "transactions": [
    {}
  ],
  "txId": "<string>"
}
Prepares unsigned transactions for approving a spender to use tokens on behalf of the signer. This endpoint is equivalent to calling /prepare-transactions with method=approve.

​
Request Body

ParameterTypeRequiredDescription
signerAddressstringYesAddress that will sign the transaction
chainIdstringYesBlockchain network identifier (hex format)
methodstringYesTransaction method type (should be “approve”)
tokenSymbolstringYesSymbol of the token to approve (BKN, USDT, USDC, etc.)
spenderAddressstringYesAddress of the spender being approved
amountstringYesAllowance amount to approve
tokenizerAddressstringNoTokenizer address (required for approve in certain flows)

​
Example Request

{
  "signerAddress": "0x742d35Cc6634C0532925a3b8D4C9db96c4b4d8b",
  "chainId": "aa36a7",
  "method": "approve",
  "tokenSymbol": "USDT",
  "spenderAddress": "0x456...",
  "amount": "1000",
  "tokenizerAddress": "0x789..."
}

​
Response

Returns an array of unsigned transactions that need to be signed and a transaction ID for tracking. 
{
  "transactions": [
    {
      "from": "0x742d35Cc6634C0532925a3b8D4C9db96c4b4d8b",
      "to": "0xTargetAddress",
      "value": {"type": "BigNumber", "hex": "0x00"},
      "nonce": 1,
      "chainId": 11155111,
      "data": "0x...",
      "type": 2,
      "maxPriorityFeePerGas": {"type": "BigNumber", "hex": "0x..."},
      "maxFeePerGas": {"type": "BigNumber", "hex": "0x..."},
      "gasLimit": {"type": "BigNumber", "hex": "0x..."}
    }
  ],
  "txId": "unique-transaction-id"
}

Authorizations

​
x-api-key
string
header
required

Body

application/json

Request body for approve method.

​
method
string

The operation to be performed.

Example:

"approve"

​
signerAddress
string
​
chainId
string
​
tokenSymbol
string
​
spenderAddress
string
​
amount
string

Response

200 - application/json

Successful response

​
transactions
object[]
required
​
txId
string
required