FIX vs. WebSocket API Connectivity

FIX Gateway:

  • The “gold standard” of connectivity in TradFi
  • Commonly utilized by those most concerned with execution and fill reporting speed
  • Less common amongst crypto natives, but gaining popularity


  • Very common amongst crypto natives
  • Simple, familiar connection process
  • BlockFills can provide resources for those using WebSocket APIs who want to adopt FIX to more effectively compete as Tradfi penetrates the market