Federal Reserve Bank of St. Louis · Market & fundamentals data
In-depth entry
Free economic database from the St. Louis Fed aggregating hundreds of thousands of US and international time series, with graphs, vintages (ALFRED), an Excel add-in and a keyed JSON/XML API
U.S. Securities and Exchange Commission · SEC/EDGAR & corporate filings
In-depth entry
The SEC's free public filing system: company and full-text search, bulk index and feed archives, and data.sec.gov JSON APIs for submissions and XBRL financial facts, subject to a fair-access rate policy
Statistics Canada (Government of Canada) · Open & public data
In-depth entry
Canada's national statistical agency publishing census, economic and social data tables with open licensing and programmatic access via Web Data Service