WebHound.ai is a 2026 autonomous AI research agent platform (YC S23) that runs long-duration, persistent agents to turn messy web data into clean structured datasets or fully cited reports. From a single prompt and budget, it gathers, verifies sources, and synthesizes info for GTM prospecting, market/competitive analysis, sales enrichment, training data, or deep dives like system architecture. Pay-as-you-go (no subs), depth scales with spend—perfect for researchers, sales, analysts, ML teams who hate manual scraping.