# Delegate

Delegate is a contract that allows users to set on-chain trading rules that accept and execute AirSwap orders that meet price criteria. In terms of the underlying SwapERC20 protocol, a trader setting rules is authorizing the Delegate to act as `sender` on its behalf. The trader interfacing with the delegate is the `signer` of each order. Delegate acts as an on-chain intermediary for cases where a Trader does not have an immediate counterparty or wishes to make an order publicly available.

See the [deployments](/technology/deployments.md) page for latest deployed Delegate contract addresses.

## Rules

To enable Delegate call the `setRule` function. Token approvals must be set up by `senderWallet` on the `senderToken` to allow Delegate to act as a spender.

```typescript
function setRule(
  address senderWallet,
  address senderToken,
  uint256 senderAmount,
  address signerToken,
  uint256 signerAmount,
  uint256 expiry
) external;
```

Rules can be updated using `setRule` again or deleted using `unsetRule`.

```typescript
function unsetRule(
  address senderWallet,
  address senderToken,
  address signerToken
) external;
```

## Swaps

To trade with Delegate, query event logs `SetRule` and `UnsetRule` for pricing information. With price in hand, create and sign an order at any time and call `swap` on the Delegate contract. Upon success, Delegate emits a `DelegateSwap` event.

```typescript
function swap(
  address senderWallet,
  uint256 nonce,
  uint256 expiry,
  address signerWallet,
  address signerToken,
  uint256 signerAmount,
  address senderToken,
  uint256 senderAmount,
  uint8 v,
  bytes32 r,
  bytes32 s
) external
```

Delegate uses SwapERC20 `swapLight` behind the scenes to complete the swap.

## Managers

A wallet usually manages its own rules. A wallet may authorize another wallet to manage rules on its behalf; for example, a cold wallet may authorize a hot wallet. To authorize a manager, call the `authorize` function on the Delegate.

```typescript
function authorize(address manager) external
```

Delegate will emit an `Authorize` event. To revoke an existing authorization, call `revoke` on the Delegate.

```typescript
function revoke() external
```

Delegate will emit a `Revoke` event.


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