Native Token Handling

KAS is the native currency of the Kasplex blockchain (similar to ETH on Ethereum). Since AMM smart contracts operate exclusively with ERC-20 tokens, KAS is wrapped as WKAS (Wrapped KAS) for on-chain operations.

KAS vs WKAS

	KAS	WKAS
Type	Native currency	ERC-20 token
Used for	Gas fees, transfers	DEX operations
Address (display)	`0x0000...0000`	Contract address
Decimals	18	18
Conversion	1 KAS = 1 WKAS (always)	1 WKAS = 1 KAS (always)

WKAS Contract Addresses

Network	WKAS Address
Mainnet	`0x2c2Ae87Ba178F48637acAe54B87c3924F544a83e`
Testnet	`0xC065C62a10fB363fD31CA394D632C4Df106566df`

How Wrapping Works

WKAS is a simple deposit/withdraw contract:

Wrap: Send KAS to the WKAS contract → receive equal WKAS
Unwrap: Call withdraw() on WKAS → receive equal KAS

The Universal Router handles this automatically during swaps. Users never need to wrap or unwrap manually.

Token Representation

In the Kroko DEX system, tokens have two address fields:

Field	KAS Value	ERC-20 Value	Used For
`address`	`0x0000...0000`	Token contract address	Display, storage keys, balance queries
`dexAddress`	WKAS address	Same as `address`	All DEX operations (swaps, quotes, liquidity, approvals)

When Calling APIs

Always use the WKAS address (not the zero address) when calling the Quote or Swap APIs with KAS as input or output:

// Correct: use WKAS address for KAS
const WKAS = "0x2c2Ae87Ba178F48637acAe54B87c3924F544a83e";
fetch(`/api/v1/quote?tokenIn=${WKAS}&tokenOut=${USDC}&amountIn=1000000000000000000`);

// Wrong: zero address will not work
fetch(`/api/v1/quote?tokenIn=0x0000000000000000000000000000000000000000&...`);

Sending Native KAS in Swaps

When KAS is the input token, include the amount as the transaction value:

const tx = await signer.sendTransaction({
  to: swapData.to,
  data: swapData.data,
  value: swapData.value  // Non-zero when selling KAS
});

The Swap API automatically sets the value field when it detects WKAS as the input token.

Overview

V2 Protocol

V3 Protocol

Infrastructure

Reference

Native Token Handling

Native Token Handling

KAS vs WKAS

WKAS Contract Addresses

How Wrapping Works

Token Representation

When Calling APIs

Sending Native KAS in Swaps

​Native Token Handling

​KAS vs WKAS

​WKAS Contract Addresses

​How Wrapping Works

​Token Representation

​When Calling APIs

​Sending Native KAS in Swaps

Native Token Handling

KAS vs WKAS

WKAS Contract Addresses

How Wrapping Works

Token Representation

When Calling APIs

Sending Native KAS in Swaps