The U.S. dollar index closed 0.27% higher at 99.809 on August 11, reflecting a firmer greenback across major currency pairs. In the foreign exchange market, the euro weakened to $1.1542 from $1.1564 in the previous session, while the pound rose slightly to $1.3509 from $1.3499. The dollar also advanced against several other currencies, climbing to 159.24 Japanese yen from 157.55 yen, 0.8101 Swiss francs from 0.8076, 1.3942 Canadian dollars from 1.3937, and 9.5016 Swedish kronor from 9.4701, according to Gate market data.