Basis just closed a $100 million Series B led by Accel, with GV and Khosla Ventures participating, at a $1.15 billion valuation. The interesting thing here is the domain, not the check size.
Accounting is one of the rare professional fields where "correct" has a precise, externally verifiable definition. Debits equal credits. Tax codes are codified. Audit standards exist and are enforceable. The specification work that most agent deployments struggle to define has been done by the profession itself, over centuries.
That the largest domain-specific agent bet lands where verification is easiest tells you something about everywhere else.