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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.

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KAS vs WKAS

KASWKAS
TypeNative currencyERC-20 token
Used forGas fees, transfersDEX operations
Address (display)0x0000...0000Contract address
Decimals1818
Conversion1 KAS = 1 WKAS (always)1 WKAS = 1 KAS (always)

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WKAS Contract Addresses

NetworkWKAS Address
Mainnet0x2c2Ae87Ba178F48637acAe54B87c3924F544a83e
Testnet0xC065C62a10fB363fD31CA394D632C4Df106566df

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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.

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Token Representation

In the Kroko DEX system, tokens have two address fields:
FieldKAS ValueERC-20 ValueUsed For
address0x0000...0000Token contract addressDisplay, storage keys, balance queries
dexAddressWKAS addressSame as addressAll DEX operations (swaps, quotes, liquidity, approvals)

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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&...`);

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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.