diff --git a/contracts/interfaces/mainInterface.sol b/contracts/interfaces/mainInterface.sol
new file mode 100644
index 00000000..6c18d883
--- /dev/null
+++ b/contracts/interfaces/mainInterface.sol
@@ -0,0 +1,51 @@
+interface DyDxInterface {
+  function ownerSetSpreadPremium ( uint256 marketId, tuple spreadPremium ) external;
+  function getIsGlobalOperator ( address operator ) external view returns ( bool );
+  function getMarketTokenAddress ( uint256 marketId ) external view returns ( address );
+  function ownerSetInterestSetter ( uint256 marketId, address interestSetter ) external;
+  function getAccountValues ( tuple account ) external view returns ( tuple, tuple );
+  function getMarketPriceOracle ( uint256 marketId ) external view returns ( address );
+  function getMarketInterestSetter ( uint256 marketId ) external view returns ( address );
+  function getMarketSpreadPremium ( uint256 marketId ) external view returns ( tuple );
+  function getNumMarkets (  ) external view returns ( uint256 );
+  function ownerWithdrawUnsupportedTokens ( address token, address recipient ) external returns ( uint256 );
+  function ownerSetMinBorrowedValue ( tuple minBorrowedValue ) external;
+  function ownerSetLiquidationSpread ( tuple spread ) external;
+  function ownerSetEarningsRate ( tuple earningsRate ) external;
+  function getIsLocalOperator ( address owner, address operator ) external view returns ( bool );
+  function getAccountPar ( tuple account, uint256 marketId ) external view returns ( tuple );
+  function ownerSetMarginPremium ( uint256 marketId, tuple marginPremium ) external;
+  function getMarginRatio (  ) external view returns ( tuple );
+  function getMarketCurrentIndex ( uint256 marketId ) external view returns ( tuple );
+  function getMarketIsClosing ( uint256 marketId ) external view returns ( bool );
+  function getRiskParams (  ) external view returns ( tuple );
+  function getAccountBalances ( tuple account ) external view returns ( address[], tuple[], tuple[] );
+  function renounceOwnership (  ) external;
+  function getMinBorrowedValue (  ) external view returns ( tuple );
+  function setOperators ( tuple[] args ) external;
+  function getMarketPrice ( uint256 marketId ) external view returns ( tuple );
+  function owner (  ) external view returns ( address );
+  function isOwner (  ) external view returns ( bool );
+  function ownerWithdrawExcessTokens ( uint256 marketId, address recipient ) external returns ( uint256 );
+  function ownerAddMarket ( address token, address priceOracle, address interestSetter, tuple marginPremium, tuple spreadPremium ) external;
+  function operate ( tuple[] accounts, tuple[] actions ) external;
+  function getMarketWithInfo ( uint256 marketId ) external view returns ( tuple, tuple, tuple, tuple );
+  function ownerSetMarginRatio ( tuple ratio ) external;
+  function getLiquidationSpread (  ) external view returns ( tuple );
+  function getAccountWei ( tuple account, uint256 marketId ) external view returns ( tuple );
+  function getMarketTotalPar ( uint256 marketId ) external view returns ( tuple );
+  function getLiquidationSpreadForPair ( uint256 heldMarketId, uint256 owedMarketId ) external view returns ( tuple );
+  function getNumExcessTokens ( uint256 marketId ) external view returns ( tuple );
+  function getMarketCachedIndex ( uint256 marketId ) external view returns ( tuple );
+  function getAccountStatus ( tuple account ) external view returns ( uint8 );
+  function getEarningsRate (  ) external view returns ( tuple );
+  function ownerSetPriceOracle ( uint256 marketId, address priceOracle ) external;
+  function getRiskLimits (  ) external view returns ( tuple );
+  function getMarket ( uint256 marketId ) external view returns ( tuple );
+  function ownerSetIsClosing ( uint256 marketId, bool isClosing ) external;
+  function ownerSetGlobalOperator ( address operator, bool approved ) external;
+  function transferOwnership ( address newOwner ) external;
+  function getAdjustedAccountValues ( tuple account ) external view returns ( tuple, tuple );
+  function getMarketMarginPremium ( uint256 marketId ) external view returns ( tuple );
+  function getMarketInterestRate ( uint256 marketId ) external view returns ( tuple );
+}