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What is Atomic Routing?

Atomic Routing enables complex multi-step DeFi operations (swap → deposit) to execute in a single transaction with all-or-nothing guarantees. Think of it as Amazon’s 1-Click Checkout for DeFi: What used to require multiple transactions, approvals, and manual coordination now happens automatically in one click.

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The Problem

Traditional DeFi workflows are complex and error-prone: Traditional Approach (5+ transactions):
  1. Approve USDC to DEX
  2. Swap USDC → EURC on DEX
  3. Wait for swap confirmation
  4. Approve EURC to Aave
  5. Deposit EURC to Aave
Risks:
  • Transaction failures at any step
  • Price changes between steps
  • High gas costs (5 separate transactions)
  • Poor user experience
  • Funds stuck if interrupted

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The Solution

1tx enables single-transaction deposits: 1tx Approach (1 transaction):
  1. User sends USDC with instrument ID
    • 1tx automatically swaps USDC → EURC
    • 1tx automatically deposits to Aave
    • User receives aEURC tokens
Benefits:
  • ✅ All steps succeed or fail together (atomic)
  • ✅ No price slippage between steps
  • ✅ 40% lower gas costs
  • ✅ One-click user experience
  • ✅ No partial state or stuck funds

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Atomicity Guarantees

1tx ensures all-or-nothing execution:

Success Case

All steps complete successfully:
  • User sends USDC ✅
  • Router swaps to EURC ✅
  • Router deposits to Aave ✅
  • User receives aEURC ✅

Failure Case

If ANY step fails, entire transaction reverts:
  • Insufficient liquidity ❌
  • Slippage exceeded ❌
  • Adapter error ❌
  • No partial state changes

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What Atomicity Means

Either everything happens or nothing happens. You’ll never be stuck with:
  • EURC when you wanted aEURC
  • Lost tokens in transit
  • Incomplete swaps
  • Failed deposits with successful swaps
No price changes between swap and deposit steps. The rate you see is the rate you get for the entire operation.
If any step fails, the entire transaction reverts automatically. Your original tokens are returned safely to your wallet.
Pay gas only once for the entire operation instead of 5 separate transactions. Average savings: 40%

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Transaction Flow Example

Let’s walk through a deposit from USDC to Aave EURC vault: At the contract level, the router path is: 
buy(instrumentId, amount, minDepositedAmount, fastTransfer, maxFee)
sell(instrumentId, yieldTokenAmount, minOutputAmount)
1

User Initiates

User wants to deposit 1000 USDC into Aave EURC vault (which requires EURC, not USDC)
2

1tx Detects Need

The router resolves the instrument and detects that USDC != EURC, so a swap is needed
3

Atomic Execution

In a single transaction:
  • Swap USDC → EURC internally
  • Deposit EURC to Aave
  • Mint aEURC to user
4

User Receives

User receives aEURC tokens and starts earning yield immediately

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Benefits

Atomicity

All steps succeed or fail together - no partial state

Gas Efficiency

40% gas savings vs manual multi-step approach

User Experience

One-click deposits - no manual coordination

Price Certainty

No price changes between swap and deposit steps

Security

Reentrancy protected, slippage controlled

Composability

Works with any ERC20 token and lending protocol

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Comparison with Alternatives

FeatureManual Multi-Tx1inch Fusion1tx Atomic Router
Single Transaction❌✅✅
Protocol Agnostic✅✅✅
Gas Optimized❌⚠️✅
Automatic Deposits❌❌✅
Slippage ProtectionManual✅✅
No Partial State❌✅✅

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Withdrawal Flow

Withdrawals work in reverse with the same atomic guarantees:
1

User Initiates Withdrawal

User wants to withdraw from Aave EURC, receive USDC
2

1tx Withdraws

1tx withdraws EURC from Aave using your aEURC tokens
3

1tx Swaps

1tx automatically swaps EURC back to USDC
4

User Receives

User receives original token (USDC) - all in one transaction
Withdrawals have the same atomicity guarantees - if any step fails, the entire transaction reverts and your aEURC tokens remain safe.
The current router implementation supports cross-chain buy() flows through CCTP, but sell() is local-chain only.

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Next Steps

Instrument Registry

Learn about universal instrument IDs

How It Works

See the complete transaction flow

Integration Guide

Start integrating atomic routing

API Reference

Query instruments via API