diff --git a/contracts/protocols/curve_3pool.sol b/contracts/protocols/curve_3pool.sol
new file mode 100644
index 0000000..1c33d3d
--- /dev/null
+++ b/contracts/protocols/curve_3pool.sol
@@ -0,0 +1,111 @@
+pragma solidity ^0.6.0;
+pragma experimental ABIEncoderV2;
+
+interface ICurve {
+    function get_virtual_price() external view returns (uint256 out);
+    function get_dy(int128 sellTokenId, int128 buyTokenId, uint256 sellTokenAmt) external view returns (uint256 buyTokenAmt);
+}
+
+interface TokenInterface {
+    function decimals() external view returns (uint);
+    function totalSupply() external view returns (uint256);
+    function balanceOf(address) external view returns (uint);
+}
+
+contract DSMath {
+
+    function add(uint x, uint y) internal pure returns (uint z) {
+        require((z = x + y) >= x, "math-not-safe");
+    }
+
+    function mul(uint x, uint y) internal pure returns (uint z) {
+        require(y == 0 || (z = x * y) / y == x, "math-not-safe");
+    }
+
+    function sub(uint x, uint y) internal pure returns (uint z) {
+        require((z = x - y) <= x, "sub-overflow");
+    }
+
+    uint constant WAD = 10 ** 18;
+
+    function wmul(uint x, uint y) internal pure returns (uint z) {
+        z = add(mul(x, y), WAD / 2) / WAD;
+    }
+
+    function wdiv(uint x, uint y) internal pure returns (uint z) {
+        z = add(mul(x, WAD), y / 2) / y;
+    }
+
+}
+
+contract CurveHelpers is DSMath {
+    /**
+    * @dev Return Curve 3pool Swap Address
+    */
+    function getCurveSwapAddr() internal pure returns (address) {
+        return 0xbEbc44782C7dB0a1A60Cb6fe97d0b483032FF1C7;
+    }
+
+    /**
+    * @dev Return Curve 3pool Token Address
+    */
+    function getCurveTokenAddr() internal pure returns (address) {
+        return 0x6c3F90f043a72FA612cbac8115EE7e52BDe6E490;
+    }
+
+    function getTokenI(address token) internal pure returns (int128 i) {
+        if (token == address(0x6B175474E89094C44Da98b954EedeAC495271d0F)) {
+        // DAI Token
+        i = 0;
+        } else if (token == address(0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48)) {
+        // USDC Token
+        i = 1;
+        } else if (token == address(0xdAC17F958D2ee523a2206206994597C13D831ec7)) {
+        // USDT Token
+        i = 2;
+        } else {
+        revert("token-not-found.");
+        }
+    }
+
+    function convertTo18(uint _dec, uint256 _amt) internal pure returns (uint256 amt) {
+        amt = mul(_amt, 10 ** (18 - _dec));
+    }
+
+    function convert18ToDec(uint _dec, uint256 _amt) internal pure returns (uint256 amt) {
+        amt = (_amt / 10 ** (18 - _dec));
+    }
+
+    function getBuyUnitAmt(
+        address buyAddr,
+        address sellAddr,
+        uint sellAmt,
+        uint buyAmt,
+        uint slippage
+    ) internal view returns (uint unitAmt) {
+        uint _sellAmt = convertTo18(TokenInterface(sellAddr).decimals(), sellAmt);
+        uint _buyAmt = convertTo18(TokenInterface(buyAddr).decimals(), buyAmt);
+        unitAmt = wdiv(_buyAmt, _sellAmt);
+        unitAmt = wmul(unitAmt, sub(WAD, slippage));
+    }
+}
+
+
+contract Resolver is CurveHelpers {
+
+    function getBuyAmount(address buyAddr, address sellAddr, uint sellAmt, uint slippage)
+        public
+        view
+        returns (uint buyAmt, uint unitAmt, uint virtualPrice)
+    {
+        ICurve curve = ICurve(getCurveSwapAddr());
+        buyAmt = curve.get_dy(getTokenI(sellAddr), getTokenI(buyAddr), sellAmt);
+        virtualPrice = curve.get_virtual_price();
+        unitAmt = getBuyUnitAmt(buyAddr, sellAddr, sellAmt, buyAmt, slippage);
+    }
+}
+
+
+contract InstaCurveThreeResolver is Resolver {
+    string public constant name = "Curve-3pool-Resolver-v1.0";
+}
\ No newline at end of file