SaturnSwap Cross-Chain Swap (Cosmic Router)

Swap tokens across 119 blockchains via SaturnSwap's UEX aggregator.

How It Works

Cross-chain swaps use a deposit-based flow — different from on-chain DEX swaps:

┌──────────────┐     ┌──────────────┐     ┌──────────────┐     ┌──────────────┐
│ 1. QUOTE     │────▶│ 2. ORDER     │────▶│ 3. DEPOSIT   │────▶│ 4. RECEIVE   │
│ Get rate     │     │ Get deposit  │     │ Send funds   │     │ Tokens arrive│
│ & fees       │     │ address      │     │ to address   │     │ on dest chain│
└──────────────┘     └──────────────┘     └──────────────┘     └──────────────┘

1. Quote — Check rate, fees, and min/max amounts
2. Create Order — Get a unique deposit address and exact amount
3. Deposit — Send the exact amount to the deposit address (on source chain)
4. Receive — Tokens arrive at destination address on the target chain

API Endpoints

All endpoints are at https://saturnswap.io/api/uex/:

Endpoint	Method	Description
/metadata	GET	List all supported chains and tokens
/quote	POST	Get swap quote with rate and fees
/order	POST	Create swap order, get deposit address

Scripts

List Supported Chains

node scripts/list-chains.js [--type cardano|evm|solana|other]

Find Token

node scripts/find-token.js --symbol ETH [--chain ethereum-mainnet]

Get Quote

node scripts/get-quote.js --from ADA --to ETH --amount 500
node scripts/get-quote.js --from-chain cardano-mainnet --from-token ADA@ADA --to-chain ethereum-mainnet --to-token ETH@ETH --amount 500

Create Order

node scripts/create-order.js --from ADA --to ETH --amount 500 --destination 0xYourEthAddress

Key Concepts

• Token IDs use the format SYMBOL@CHAIN_SYMBOL (e.g. ADA@ADA, ETH@ETH, SOL@SOL)
• Chain IDs are slugified (e.g. cardano-mainnet, ethereum-mainnet, solana-mainnet)
• Cardano tokens use cardano:<policyId><assetName> format for non-ADA tokens
• Deposit address is unique per order — send the EXACT depositAmount
• Orders that require Cardano signing return requiresSignature: true + unsignedTxCbor
• Cross-chain swaps typically take 5-30 minutes depending on chain confirmation times
• Min/max amounts are enforced — quote returns minAmountIn and maxAmountIn

Chain Types

Type	Examples	Wallet
cardano	Cardano mainnet	CIP-30 (Nami, Eternl)
evm	Ethereum, Polygon, Arbitrum, Base, Optimism	MetaMask
solana	Solana mainnet	Phantom
other	Bitcoin, BSC, DOGE, TRX, etc.	Deposit-only (send to address)

Order Status Flow

waiting_for_deposit → confirming → swapping → sending → completed
                                                      ↘ expired / refunded / failed

Safety Rules

• Always show the quote before creating an order (rate, fees, min/max)
• Verify destination address matches the correct chain — wrong chain = lost funds
• Check min/max amounts — amounts outside range will fail
• Warn about fees — cross-chain fees are shown in feeAmount
• Confirm before order creation — orders create real deposit addresses
• Display units everywhere — amounts are human-readable, not base units