That’s exactly what I started: https://gitlab.com/logotype/fixparser

It’s a quite boring project, but it is niche - and there is no alternative, at least not in the JS/TS ecosystem. Many startups/crypto/financial institutions (including YC startups) uses and are paying customers of my product.

I’ve tried finding an investor (including YC) to grow the project but no-one is interested. It doesn’t matter, I’ll keep going anyway. But if someone is interested reach me at info@fixparser.io