Execute a Trade (on chain)
In this guide, we will build a simple contract that purchases call options from the Lyra AMM.
base denotes the option asset and quote represents the unit of pricing. For the ETH market quote is sUSD and base is sETH.

1. Import LyraAdapter.sol

Use the LyraAdapter.sol contract to get all Lyra related functionality in one contract. Install the @lyrafinance/protocol package and follow the setup instructions.
pragma solidity 0.8.9;
import {LyraAdapter} from "@lyrafinance/protocol/contracts/periphery/LyraAdapter.sol";
// Libraries
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
contract TraderExample is LyraAdapter {
constructor() LyraAdapter()
uint[] public activePositionIds;
function initAdapter(
address _lyraRegistry,
address _optionMarket,
address _curveSwap,
address _feeCounter
) external onlyOwner {
// set addresses for LyraAdapter
setLyraAddresses(_lyraRegistry, _optionMarket, _curveSwap, _feeCounter);
Call getMarketDeploys via @lyrafinance/protocol to get required addresses.

2. Open a new position

Lyra options are organized by OptionMarket, boardId, strikeId and positionId:
  • OptionMarket - contract/address that manages options for an underlying base/quote pair (e.g. ETH/USD)
  • boardId - contains multiple strikes sharing the same expiry (e.g. all strikes that expire August 24th, 2022)
  • strikeId - signifies all optionTypes with the same strike price ($1500 strike for the August 24th, 2022 board)
  • positionId - single ERC721 option position (a trader can open several positions per strikeId)
Each position must choose an optionType - long/short; call/put; base/quote collateralized, specified by the following enum:
enum LyraAdapter.OptionType {
SHORT_CALL_BASE, // base collateral
SHORT_CALL_QUOTE, // quote collateral
SHORT_PUT_QUOTE // quote collateral
When opening/adjusting a position, we need to consider 4 more params:
  • setCollateralTo - for shorts, what collateral should be remaining for the position after the trade
  • minTotalCost/maxTotalCost - boundaries for the totalCost (premium + volatility slippage + fees) at trade execution (otherwise revert)
  • iterations - number of sub orders to cut into (only relevant for very large orders). This helps optimize the black-scholes price for very large trades (refer to appendix C of the whitepaper for more details).
Let's create a simple wrapper function which the Owner can call to open any position. LyraAdapter.sol contains all the needed data types to complete this order.
function openNewPosition(uint strikeId, OptionMarket.OptionType optionType, uint amount, uint setCollateralTo) external onlyOwner {
TradeInputParameters tradeParams = TradeInputParameters({
strikeId: strikeId,
positionId: 0, // if 0, new position is created
iterations: 3, // more iterations use more gas but incur less slippage
optionType: optionType,
amount: 10,
setCollateralTo: setCollateralTo, // set to 0 if opening long
minTotalCost: 0,
maxTotalCost: type(uint).max,
TradeResult result = _openPosition(tradeParams); // built-in LyraAdapter.sol function
Note: For the sake of simplicity, we have removed units from these function calls. In reality, these values would be multiplied by the unit of the tokens (1e18).

3. Get existing position details

Use the built-in LyraAdapter.sol position getter and struct.
OptionPosition position = _getPositions([1, 2, 3]); // get positions with IDs #1, #2, #3
For reference:
struct LyraAdapter.OptionPosition {
// OptionToken ERC721 identifier for position
uint positionId;
// strike identifier
uint strikeId;
OptionType optionType;
// number of options contract owned by position
uint amount;
// collateral held in position (only applies to shorts)
uint collateral;
PositionState state;

4. Adjust existing position amount and collateral

Now, let's do a more complex trade
  • close only 50% of the current position.amount
  • but at the same time increase position.collateral by some amount
We use the same TradeInputParameters struct but this time we call closePosition as we are reducing the position amount. Let's use the same position variable to fill in the static params.
function reducePositionAndAddCollateral(uint positionId, uint reduceAmount, uint addCollatAmount, bool isForceClose) external onlyOwner{
Position position = _getPositions(_singletonArray(positionId)); // must first convert number into a static array
TradeInputParameters tradeParams = TradeInputParameters({
strikeId: position.strikeId,
positionId: position.positionId,
iterations: 3,
optionType: position.optionType,
amount: position.amount / 2, // closing 50%
setCollateralTo: position.collateral + addCollatAmount, // increase collateral by addCollatAmount
minTotalCost: 0,
maxTotalCost: type(uint).max, // assume we are ok with any premium amount
// built-in LyraAdapter.sol functions
if (!isForceClose) {
} else {
If we were to set TradeInputParams.amount = position.amount, the position would be fully closed and position.state would be set to CLOSED. This will send back all the position collateral for shorts regardless of the setCollateralTo input.

5. Force Closing (a.k.a Universal Closing)

When reducing the position in the above function, we gave the owner two options. Traders can either call _closePosition() which works for positions within a certain delta range (~8-92) or use _forceClosePosition() to reduce amount on positions with deltas beyond the range or options that are very close to expiry in exchange for a fee. LyraAdapter.sol provides a _closeOrForceClosePosition() alternative which will automatically decide the best option depending on delta/cutoff conditions.
The order flow/logic of OptionMarket.forceClose() and OptionMarket.liquidate() have two distinct features that differentiate them from closePosition.
  • GWAV skew * vol * penalty (instead of the AMM spot skew * vol) are used to compute the black-scholes price
  • The AMM only applies slippage to the skew (and not baseIv)
Refer to OptionGreekCache.getPriceForForceClose() for the exact mechanism

6. Settle expired position

Once block.timestamp > the listing expiry, Lyra keepers auto-settle everyone's expired positions via ShortCollateral.settleOptions(uint[] positionIds).However, anyone can settle positions manually if they wish to.

Settle scenarios:

    • if spot > strike: amount * (spot - strike) reserved per option to pay out to the user (in quote)
    • if spot < strike: amount * (strike - spot) reserved per option to pay out to the user (in quote)
    • if spot > strike: amount * (spot - strike) paid to LP from position.collateral (automatically converted to quote)
    • remainder is sent to trader in base
    • if spot > strike: amount * (spot - strike) paid to LP from position.collateral (in quote)
    • remainder is sent to trader in quote
    • if spot < strike: amount * (strike - spot) paid to LP from position.collateral (in quote)
    • remainder is sent to trader in quote

Common revert scenarios

Trading rewards

Refer to trading rewards