SLSergiy Lutsakinfix-api.hashnode.dev·4h ago · 13 min readFIX 4.4 in C# From Scratch: Build, Checksum and Parse Orders Without a LibraryEvery broker that offers "FIX API access" is offering the same thing underneath: a TCP socket that speaks the Financial Information eXchange protocol. Most .NET developers meet FIX through QuickFIX/n,00