The site is very snappy, which matches well your pitch.

However your principal selling point - the nanosecond-level speed - falls flat because it's a property important in self-hosted scenarios. Once you put your super speedy stuff behind a web-based API, that selling point becomes completely meaningless. The fact that once our data hits your servers it is handled really quickly doesn't mean much. I am sure you are perfectly aware of that.

That is, your pitch is disconnected from your actual offering. If you are selling speed, it needs to be a product, not a service. It doesn't need not be open source though, just looks at something like kdb+.