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GET
/
swap
/
v1
/
{chainId}
/
approve
/
transaction
Generate approve transaction data
curl --request GET \
  --url https://api.akka.finance/swap/v1/{chainId}/approve/transaction \
  --header 'apikey: <api-key>'
{
  "data": "0x095ea7b3000000000000000000000000cce7452db4392b40aa0e1592a7c486e13bf69654ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
  "gasPrice": "100000000",
  "to": "0xB8CE59FC3717ada4C02eaDF9682A9e934F625ebb",
  "value": "0"
}

​
Unlimited vs. specific approval

  • Omit amount: Grants unlimited approval. The AKKA Router can spend any amount of this token. Recommended for frequent swapping — you only need to approve once.
  • Set amount: Grants approval for exactly this many tokens (in wei). More secure, but requires a new approval transaction each time the allowance is consumed.

​
Using the response

Sign and submit the returned transaction object to the blockchain: 
const hash = await walletClient.sendTransaction({
  to: approveTx.to,     // Token contract address
  data: approveTx.data,  // Encoded approve() calldata
  value: BigInt(approveTx.value), // Always "0"
});

await publicClient.waitForTransactionReceipt({ hash });
Wait for the approval transaction to be confirmed before calling the swap endpoint.

Authorizations

​
apikey
string
header
required

API key for authentication. Contact AKKA on Telegram to obtain your key.

Path Parameters

​
chainId
enum<integer>
required

Blockchain chain ID

Available options:
999
Example:

999

Query Parameters

​
tokenAddress
string
required

Contract address of the token to approve.

Pattern: ^0x[a-fA-F0-9]{40}$
Example:

"0xB8CE59FC3717ada4C02eaDF9682A9e934F625ebb"

​
amount
string

Number of tokens to approve (in wei). If omitted, unlimited approval is granted (type(uint256).max).

Example:

"1000000000000000000"

Response

Approve transaction data generated successfully

​
data
string
required

Encoded ERC-20 approve() calldata

Example:

"0x095ea7b3..."

​
gasPrice
string
required

Gas price in wei

Example:

"100000000"

​
to
string
required

Token contract address (send the approval tx to this address)

Example:

"0xB8CE59FC3717ada4C02eaDF9682A9e934F625ebb"

​
value
string
required

Always "0" for approve transactions

Example:

"0"