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Overview

LeoKit supports cross-chain swaps across 30+ blockchains spanning multiple ecosystems including EVM, UTXO, Cosmos, and other specialized chains.

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EVM Chains

EVM (Ethereum Virtual Machine) compatible chains use the same address format and transaction structure.

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EVM Chain Features

  • Address Format: 0x-prefixed hexadecimal (42 characters)
  • Token Standard: ERC-20, BEP-20 (same interface)
  • Gas Model: Base fee + priority fee (EIP-1559 on most chains)
  • Transaction Type: Supports both legacy and EIP-1559 transactions
  • Approval Required: Yes, for token swaps (except native asset swaps)

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EVM-Specific Notes

  • Ethereum (ETH): Highest security, highest fees, most liquidity
  • Arbitrum (ARB): Layer 2 rollup, low fees, fast finality
  • Avalanche (AVAX): High throughput, subsecond finality
  • Base (BASE): Coinbase Layer 2, growing ecosystem
  • BSC: High speed, low fees, Binance ecosystem
  • Polygon: Low fees, high speed, popular for DeFi
  • Optimism: Layer 2 rollup, optimistic rollup design
  • Fantom: High speed, DeFi focused

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UTXO Chains

UTXO (Unspent Transaction Output) chains use Bitcoin-like transaction models.

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UTXO Chain Features

  • Transaction Format: PSBT (Partially Signed Bitcoin Transaction) for most
  • Dust Limit: Minimum output thresholds to prevent spam
    • BTC/LTC: 546 satoshis
    • DOGE: 100,000,000 shibes (1 DOGE)
  • Memo Support: OP_RETURN outputs for cross-chain swaps
  • Change Outputs: Automatic change calculation and dust handling

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UTXO-Specific Notes

  • Bitcoin (BTC): Most secure, highest liquidity, SegWit native
  • Litecoin (LTC): Faster blocks (2.5 min), SegWit support
  • Dogecoin (DOGE): High transaction volume, meme culture
  • DASH: InstantSend for fast confirmations, raw tx format (not PSBT)
  • Bitcoin Cash (BCH): Larger blocks, lower fees
  • Zcash (ZEC): Privacy features available

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Memo Length Limits

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Cosmos Chains

Cosmos SDK-based chains use account-based models with IBC (Inter-Blockchain Communication).

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Cosmos Chain Features

  • Address Format: Bech32 encoding with chain-specific prefix
    • THOR: thor1...
    • MAYA: maya1...
    • GAIA: cosmos1...
    • KUJI: kujira1...
  • Transaction Type: Cosmos SDK messages (MsgSend, MsgDeposit, etc.)
  • Gas Model: Fixed or simulated gas with buffer (typically 1.3x)
  • Memo Support: Native memo field in transactions

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Cosmos-Specific Notes

  • THORChain (THOR): Cross-chain liquidity protocol, uses MsgDeposit for native swaps
  • MAYAChain (MAYA): THORChain fork, 10 decimals for CACAO (not 8!)
  • Cosmos Hub (GAIA): Main Cosmos chain, IBC hub
  • Kujira (KUJI): DeFi platform with native DEX

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Other Chains

Specialized chains with unique architectures.

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Chain-Specific Details

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NEAR Protocol

  • Decimals: 24 (yoctoNEAR)
  • Contract Format: name.factory.bridge.near (can contain hyphens)
  • Token Standard: NEP-141
  • Gas: Fixed 30 TGas for ft_transfer
  • Deposit Requirement: 1 yoctoNEAR for token transfers

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Ripple (XRP)

  • Decimals: 6 (drops)
  • Reserve Requirement: Minimum balance required
  • Destination Tags: Supported for exchange deposits

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Solana (SOL)

  • Decimals: 9 (lamports)
  • Token Standard: SPL tokens
  • High Performance: Sub-second finality

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Tron (TRON)

  • Decimals: 6 (sun)
  • Token Standard: TRC-20
  • Energy System: Alternative to gas fees

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Cardano (ADA)

  • Decimals: 6 (lovelace)
  • UTXO Model: Extended UTXO with smart contracts
  • Native Tokens: Multi-asset ledger

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Protocol Support Matrix

Different protocols support different blockchain ecosystems.

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Chain Selection Guidelines

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For Speed

  1. Fastest Finality: Solana, Avalanche, Fantom
  2. Fast Confirmation: NEAR, BSC, Polygon
  3. Standard Speed: Ethereum, Bitcoin

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For Low Fees

  1. Lowest Fees: Polygon, BSC, Fantom
  2. Low Fees: Arbitrum, Base, Optimism
  3. Medium Fees: Avalanche, NEAR

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For Security

  1. Highest Security: Bitcoin, Ethereum
  2. High Security: Litecoin, Cosmos chains
  3. Growing Security: Layer 2s (Arbitrum, Optimism)

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For Liquidity

  1. Highest Liquidity: Ethereum, Bitcoin
  2. High Liquidity: BSC, Polygon, Arbitrum
  3. Growing Liquidity: Base, NEAR, Avalanche

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Chain-Specific Limitations

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Bitcoin (BTC)

  • Memo length limited to 150 bytes for THORChain swaps
  • SegWit required for optimal fee calculation

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Dogecoin (DOGE)

  • Shorter memo limit (80 bytes) may require THORNames
  • Higher dust threshold (1 DOGE)
  • Non-SegWit transaction format

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NEAR Protocol

  • Limited token support (requires asset equivalents mapping)
  • 90-minute quote expiration
  • 1 yoctoNEAR deposit required for token transfers

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MAYAChain (MAYA)

  • CACAO uses 10 decimals (not 8 like other Cosmos chains)
  • Conflicting tolerance parameters not allowed
  • Router field required in responses

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EVM Chains

  • USDT requires allowance reset to 0 before new approval
  • Some tokens may require multiple approval transactions
  • Gas estimation may fail, requiring fallback values

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Adding New Chains

To request support for additional chains, please contact support@leofinance.io with:
  • Chain name and ticker symbol
  • Blockchain type (EVM/UTXO/Cosmos/Other)
  • Use case and expected volume
  • Community size and ecosystem maturity