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contracts/Reputation.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.9;
+
+import { IReputation } from "./lib/interfaces/IReputation.sol";
+import { Owned } from "./lib/auth/Owned.sol";
+import { FixedPointMathLib as WADMath } from "./lib/utils/FixedPointMathLib.sol";
+
+
+contract Reputation is 
+  IReputation, 
+  Owned(msg.sender) 
+{
+
+  using WADMath for uint256;
+
+  /// @dev Asymptote numerator constant value for the `limiter` fx.
+  uint256 constant public maxLimit = 1e6; 
+  /// @dev Denominator's constant operand for the `limiter` fx. 
+  uint256 constant public magicValue = 2.5e11;
+
+  constructor(/*  */) {/*  */}
+
+  function limiter(uint256 _userCredit) 
+  external 
+  pure 
+  override(IReputation)
+  returns(uint256 _spendLimit) 
+  {
+    // _spendLimit = 1 + ( ( maxLimit * _userCredit ) / sqrt( magicValue * ( _userCredit * _userCredit ) ) );
+    // return _spendLimit;
+
+
+    unchecked {
+      uint256 numeratorWad = 
+        maxLimit.mulWadDown(_userCredit);
+      uint256 userCreditSquaredWad = 
+        _userCredit.mulWadDown(_userCredit);
+      uint256 denominatorSqrtWad = 
+        (userCreditSquaredWad.mulWadDown(magicValue)).sqrt();
+      
+      _spendLimit = (1 + (numeratorWad).divWadDown(denominatorSqrtWad));
+    }
+  }
+
+}