The average rate on a 30-year fixed-rate mortgage plunged seven basis points, the 15-year fixed rate fell six basis points and the 5/1 ARM fell one basis point, according to a NerdWallet survey of daily mortgage rates published by national lenders Wednesday. The 30-year, fixed-rate mortgage is six basis points lower than one week ago, and 31 basis points lower than one year... More from NerdWallet Calculate your mortgage payment Compare mortgage rates How much home can you afford? Holden Lewis is a writer at NerdWallet.