Low-cost APIs for crypto sentiment & market intelligence — what actually works?

I’m building a crypto intelligence engine (risk, sentiment, market, delta-based insights).

I’m specifically looking for low-cost or sustainable APIs for:

– social / sentiment signals (Twitter, Reddit, news, etc.)

– basic market regime & trend context (beyond just price)

Many services provide either raw social data or very expensive “black box” sentiment scores.

From experience:

Which APIs or data sources actually deliver a useful signal for sentiment/market context?

And which ones turned out to be noise?

Not looking to shill a product — genuinely trying to design a clean MVP pipeline.