Skip to main content

Supported Chains and Token Addresses

· 4 min read
swapapi
swapapi
swapapi Team

swapapi supports 46 EVM-compatible blockchains. Use the chain ID in your API requests.

Major Chains​

ChainChain IDNative TokenNotes
Ethereum1ETHMainnet, highest liquidity
Arbitrum42161ETHL2 rollup, low fees
Base8453ETHCoinbase L2, fast finality
Optimism10ETHL2 rollup, EVM equivalent
Polygon137POLSidechain, low fees
BSC56BNBBinance chain, high throughput
Avalanche43114AVAXSubnets, fast finality
Fantom250FTMDAG-based, fast
Gnosis100xDAIStablecoin-native

Layer 2 Chains​

ChainChain IDNative TokenType
Linea59144ETHzkEVM
Scroll534352ETHzkEVM
Blast81457ETHOptimistic L2
Mantle5000MNTModular L2
Mode34443ETHOptimistic L2
zkSync Era324ETHzkEVM
Polygon zkEVM1101ETHzkEVM
Arbitrum Nova42170ETHAnyTrust
Taiko167000ETHBased rollup
Manta169ETHzkEVM

Emerging Chains​

ChainChain IDNative TokenNotes
Sonic146SHigh throughput
Berachain80094BERAEVM-compatible
Monad143MONParallel EVM
MegaETH4326ETHReal-time blockchain

Other EVM Chains​

ChainChain IDNative TokenNotes
Celo42220CELOMobile-first
Cronos25CROCrypto.com chain
Kava2222KAVACosmos SDK
Metis1088METISOptimistic L2
Filecoin314FILStorage network
Core1116COREBitcoin-aligned
Boba288ETHHybrid compute
Boba BNB56288BOBABNB L2
BTTC199BTTBitTorrent
Haqq11235ISLMIslamic finance
Harmony1666600000ONESharded
ThunderCore108TTPoS
ZetaChain7000ZETAOmnichain
SKALE Europa2046399126sFUELApp-specific
Rootstock30RBTCBitcoin sidechain
zkLink810180ETHAggregated L3
ApeChain33139APEApeCoin ecosystem
Hemi43111ETHModular
Tatara129399ETHL2
Katana747474ETHGame-focused
HyperEVM999HYPEHyperliquid
Plasma9745pETHL2
X Layer196OKBOKX chain

Token Addresses by Chain​

Ethereum (Chain ID: 1)​

TokenAddressDecimals
WETH0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc218
USDC0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB486
USDT0xdAC17F958D2ee523a2206206994597C13D831ec76
DAI0x6B175474E89094C44Da98b954EedeAC495271d0F18
WBTC0x2260FAC5E5542a773Aa44fBCfeDf7C193bc2C5998

Arbitrum (Chain ID: 42161)​

TokenAddressDecimals
WETH0x82aF49447D8a07e3bd95BD0d56f35241523fBab118
USDC0xaf88d065e77c8cC2239327C5EDb3A432268e58316
USDT0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb96
DAI0xDA10009cBd5D07dd0CeCc66161FC93D7c9000da118

Base (Chain ID: 8453)​

TokenAddressDecimals
WETH0x420000000000000000000000000000000000000618
USDC0x833589fCD6eDb6E08f4c7C32D4f71b54bdA029136
USDT0xfde4C96c8593536E31F229EA8f37b2ADa2699bb26
DAI0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb18

Optimism (Chain ID: 10)​

TokenAddressDecimals
WETH0x420000000000000000000000000000000000000618
USDC0x0b2C639c533813f4Aa9D7837CAf62653d097Ff856
USDT0x94b008aA00579c1307B0EF2c499aD98a8ce58e586
DAI0xDA10009cBd5D07dd0CeCc66161FC93D7c9000da118

Polygon (Chain ID: 137)​

TokenAddressDecimals
WMATIC0x0d500B1d8E8eF31E21C99d1Db9A6444d3ADf127018
USDC0x3c499c542cEF5E3811e1192ce70d8cC03d5c33596
USDT0xc2132D05D31c914a87C6611C10748AEb04B58e8F6
DAI0x8f3Cf7ad23Cd3CaDbD9735AFf958023239c6A06318

BSC (Chain ID: 56)​

Decimal Gotcha

USDC and USDT on BSC use 18 decimals instead of 6. Always verify before constructing transactions.

TokenAddressDecimals
WBNB0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c18
USDC0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d18
USDT0x55d398326f99059fF775485246999027B319795518
DAI0x1AF3F329e8BE154074D8769D1FFa4eE058B1DBc318

Making Requests​

Use the chain ID in the URL path:

# Ethereum
curl "https://api.swapapi.dev/v1/swap/1?tokenIn=...&tokenOut=..."

# Arbitrum
curl "https://api.swapapi.dev/v1/swap/42161?tokenIn=...&tokenOut=..."

# Base
curl "https://api.swapapi.dev/v1/swap/8453?tokenIn=...&tokenOut=..."

TypeScript Helper​

const CHAINS = {
  ETHEREUM: 1,
  ARBITRUM: 42161,
  BASE: 8453,
  OPTIMISM: 10,
  POLYGON: 137,
  BSC: 56,
  AVALANCHE: 43114,
  FANTOM: 250,
  // ... add more as needed
} as const;

async function swap(chainId: number, tokenIn: string, tokenOut: string, amount: string) {
  const res = await fetch(
    `https://api.swapapi.dev/v1/swap/${chainId}?` +
    `tokenIn=${tokenIn}&tokenOut=${tokenOut}&amount=${amount}&sender=${sender}`
  );
  return res.json();
}

Chain Selection Tips​

For Lowest Fees​

Use L2s: Base, Arbitrum, Optimism. Transaction costs are 10-100x lower than Ethereum mainnet.

For Highest Liquidity​

Ethereum mainnet has the deepest liquidity for major tokens.

For Fastest Finality​

Base and Arbitrum have ~1-2 second block times.

For Specific Ecosystems​

  • DeFi: Ethereum, Arbitrum, Base
  • Gaming: Polygon, Immutable X
  • Payments: Gnosis (xDAI), Base
  • Bitcoin-aligned: Rootstock

Adding New Chains​

Request new chain support by opening an issue on GitHub. We prioritize chains with:

  1. Significant TVL and user base
  2. Active DeFi ecosystem
  3. Reliable RPC infrastructure
  4. Community demand