Insofar as home ownership is a key contributing factor to the health of the US economy, the mortgages that back home loans are a positive indicator of the strength of the housing market.

Source: https://ycharts.com/indicators/mortgage_originations

The Federal Housing Administration insures private mortgage lenders against the possibility of default. FHA insured loans are a form of federal assistance. The FHA market share therefore indicates the strength of private versus public mortgage insurance.

Source: http://portal.hud.gov/hudportal/HUD?src=/program_offices/housing/rmra/oe/rpts/fhamktsh/fhamktqtrly

The Mortgage Bankers Association releases data on the number of mortgages that they forecast will be originated each quarter. Mortgages originations, shown in dollars, indicates the level of market activity. Divided here between original purchases and refinances provides even greater insight into the types of originations and the condition of the market recovery.

Source: https://www.mba.org/news-research-and-resources/research-and-economics/forecasts-and-commentary/mortgage-finance-forecast-archives

Data Release: http://www.mbaa.org/ResearchandForecasts/ForecastsandCommentary