

Polar
Merchant of record for software and AI apps

AI-native accounting for startups

About
Puzzle connects to tools like Stripe, Mercury, Ramp, Brex and Gusto and keeps cash and accrual books current with up to 98% auto-categorization. Its AI Suite (Chat, Cowork, Close) helps answer questions and run the month-end close, and you can add a vetted accountant on top. The Puzzle MCP server is read-only by default, with opt-in write access that requires confirmation.
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