1inch Limit Order Protocol Smart Contract

Version warning

The master branch contains the latest work-in-progress version of limit orders. It hasn't been audited and may contain severe security issues or may not work at all.

Please, use the commit tagged version to get the latest production version that has passed through a series of security audits:

• tag 4.0.0 Limit order protocol v4 / security audits
• tag 3.0.1 Limit order protocol v3 / security audits
• tag v2 - Limit order protocol v2 / security audits

About

You can find the latest general overview and documentation on the 1inch limit orders protocol in the description.md. Documentation for this and previous versions can be found on the 1inch documentation portal.

The repository contains smart contracts for EVM-based blockchains (such as Ethereum, Binance Smart Chain, etc.). These contracts are a core part of the 1inch limit order protocol, allowing users to create limit orders off-chain that can be filled on-chain. A limit order is a data structure signed according to EIP-712.

Limit Order

The key features of the protocol are extreme flexibility and high gas efficiency, which are achieved with the following features

Basic features

• Select an asset receiver for an order.
• Choose whether to allow or disallow partial and multiple fills.
• Define conditions that must be met before execution can proceed (e.g. stop-loss, take-profit orders).
• Specify interactions (arbitrary maker's code) to execute before and after order filling.
• Choose an approval scheme for token spend (approve, permit, permit2).
• Request that WETH be unwrapped to ETH either before (to sell ETH) or after the swap (to receive ETH).
• Make an order private by specifying the only allowed taker's address.
• Set the order's expiration date.
• Assign a nonce or epoch to the order for easy cancellation later.

Advanced features

• Define a proxy to handle transfers of assets that are not compliant with IERC20, allowing the swapping of non-ERC20 tokens, such as ERC721 or ERC1155.
• Define functions to calculate, on-chain, the exchange rate for maker and taker assets. These functions can be used to implement dutch auctions (where the rate decreases over time) or range orders (where the rate depends on the volume already filled), among others.

RFQ orders

Separate RFQ order are deprecated in v4. To create the most gas efficient order use a basic order without extensions.

Supported tokens

• ERC 20
• ERC 721
• ERC 1155
• Other token standards could be supported via external extension

Deployments & audits (Limit Orders Protocol v4):

You can find 1inch Router v6 and 1inch Limit Order protocol v4 deployments here:

Ethereum mainnet: 0x111111125421ca6dc452d289314280a0f8842a65

BSC mainnet: 0x111111125421ca6dc452d289314280a0f8842a65

Polygon mainnet: 0x111111125421ca6dc452d289314280a0f8842a65

Optimism Mainnet: 0x111111125421ca6dc452d289314280a0f8842a65

Arbitrum One: 0x111111125421ca6dc452d289314280a0f8842a65

Gnosis Chain: 0x111111125421ca6dc452d289314280a0f8842a65

Avalanche: 0x111111125421ca6dc452d289314280a0f8842a65

Fantom: 0x111111125421ca6dc452d289314280a0f8842a65

Aurora: 0x111111125421ca6dc452d289314280a0f8842a65

Kaia: 0x111111125421ca6dc452d289314280a0f8842a65

Base: 0x111111125421ca6dc452d289314280a0f8842a65

zkSync Era: 0x6fd4383cb451173d5f9304f041c7bcbf27d561ff

You can find audit reports on etherscan and in the separate audit repository.

Utils library (Limit Orders Protocol v4)

Plenty of utils that helps create & sign orders are available in our typescript utils library:

• 1inch Limit Order Utils