1inch (oneinch)

​

When to use it

• An aggregator: its router fills a swap across many venues along a route its off-chain API quotes. Use it for a route the program does not want to choose itself.

​

Pitfalls for a program

• The calldata is quoted for one sender, amount and moment: quote it for the Pot (the swap’s sender) and send it soon.
• Approve the router for exactly amountIn, and clear the allowance after.
• The calldata’s own minimum is not yours: check the output as a balance delta against your minOut.

​

In a Sauce program

function main(amountIn: Uint256, minOut: Uint256, call: bytes, recipient: Address) {
  const before = WETH.balanceOf(pot);
  USDC.approve(Oneinch.AggregationRouterV6, amountIn);
  evm.call(Oneinch.AggregationRouterV6, 0, call);
  const out = WETH.balanceOf(pot) - before;
  require(out >= minOut, "below minOut");
  USDC.approve(Oneinch.AggregationRouterV6, 0);
  WETH.transfer(recipient, out);
}

​

What it offers

• unoswap: Single-source optimized swap via AggregationRouter
• swap: Multi-source aggregated swap with custom routing

​

Notes

• Same contract address across all 7 chains
• V6 router is the latest version
• unoswap is gas-efficient for single-pool swaps; swap handles complex multi-hop routes
• dex in unoswap packs the pool address with its protocol and swap-direction flags in the high bits
• Fusion mode enables gasless swaps via order matching (off-chain, not in ABI)
• Approve srcToken to aggregationRouterV6 before swapping

​

Its names in a program

function main() {
  // Ethereum's aggregationRouterV6, `0x111111125421cA6dc452d289314280a0f8842A65`.
  require(Oneinch.AggregationRouterV6 != 0);
}

​

Deployments

​

ABI

​

AggregationRouterV6ABI

• swap(address executor, (address srcToken, address dstToken, address srcReceiver, address dstReceiver, uint256 amount, uint256 minReturnAmount, uint256 flags) desc, bytes data) payable returns (uint256 returnAmount, uint256 spentAmount)
• unoswap(uint256 token, uint256 amount, uint256 minReturn, uint256 dex) returns (uint256 returnAmount)

​

Next steps

• Protocols: the other protocols, by what they do.
• Protocols and tokens: calling a contract by its namespace, or through its ABI.
• Glossary: the words these pages use, in plain terms.