Institutions seeking the highest quality infrastructure and deepest digital asset liquidity can connect to the BlockFills API for 24/7, 365 market access. BlockFills offers industry-leading reliability through its networking and hosting solutions.

Through a connection to our FIX Gateway or WebSocket API, your firm can access an ECN platform for spot and derivatives products whose pedigree can be traced back to high-speed multi-asset trading in traditional markets. We also offer access to a REST API for balances, positions, and transaction history, which can easily be connected to your middle and/or back-office system or fund admin. Getting connected and trading does not have to take months or even weeks.

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

The Process:

  • BlockFills will set up a UAT environment and provide credentials and clear documentation, as well as support.
  • Test trade in UAT environment.

  • Move into Production.

  • Trade live.

By completing the form below, I agree that I am authorized to provide the requested information.