Vertical AI
AI collections agency for late stage portfolios
Callbook AI is a collections agency operated by AI. We collect late stage portfolios by finding, contacting and negotiating with borrowers. The company was founded by Diego Avellaneda; Daniel Martinez.
It is part of YC Summer 2026. It is based in San Francisco, CA, USA; Remote.
| Fact | Detail |
|---|---|
| Batch / Program | YC Summer 2026 |
| Headquarters | San Francisco, CA, USA; Remote |
| Industry | B2B |
| Category | Vertical AI Startups |
| Founders | Diego Avellaneda, Daniel Martinez |
| Website | callbook.ai |
Listed in the AIToolGuide 2026 startups database (513 AI companies). Listings are free; no paid offers. Data as recorded from Y Combinator batch listings, November 2026.
