src/Smalot/Magento/Catalog/Product.php
public function setSpecialPrice(
        $productId,
        $specialPrice,
        $fromDate,
        $toDate,
        $storeView = null,
        $productIdentifierType = null
    ) {
        return $this->__createAction('catalog_product.setSpecialPrice', func_get_args());
    }
public function setSpecialPrice(
        $productId,
        $specialPrice,
        $fromDate,
        $toDate,
        $storeView = null,
        $productIdentifierType = null
    ) {
        return $this->__createAction('catalog_product.setSpecialPrice', func_get_args());
    }
public function setSpecialPrice ( $ productId , $ specialPrice , $ fromDate , $ toDate , $ storeView = null , $ productIdentifierType = null ) { return $ this -> __createAction ( 'catalog_product.setSpecialPrice' , func_get_args ( ) ) ; }
Allows you to set the product special price.

@param string $productId
@param string $specialPrice
@param string $fromDate
@param string $toDate
@param string $storeView
@param string $productIdentifierType

@return ActionInterface
Allows you to set the product special price .