The Adanos Market Sentiment API is a single endpoint for sentiment and attention data across stocks and crypto. It aggregates signals from five sources, Reddit, X, financial news, Polymarket and crypto communities, and returns them as clean, comparable JSON. For any ticker, the API provides a buzz score that captures how much attention an instrument is attracting, a sentiment score with bullish and bearish breakdowns, mention and unique-post counts, source and subreddit coverage, total engagement, and multi-day trend histories. Endpoints include trending tickers, single-ticker deep dives, whole-market overviews, side-by-side comparison of multiple tickers, and AI-generated explanations of why a ticker is moving in conversation. Three use cases drive adoption. First, social buzz often leads price: retail attention tends to build before price moves, and the buzz score tracks that build-up across sources. Second, cross-source spreads are themselves a signal: when Reddit is bullish while X is bearish on the same ticker, single-source tools miss it but Adanos surfaces it in one call. Third, AI agents use the accompanying CLI to fetch structured sentiment from five sources in under 200 milliseconds, working out of the box with Claude, ChatGPT or any tool-use framework. The API is RESTful, returns JSON, supports webhook alerts and is documented with an OpenAPI specification. It is offered on tiered subscription plans with a free tier for evaluation and is backed by 99.9% uptime monitoring. The solution is built and operated in Berlin by Adanos Software.