Spendline, Inc. builds AI spend governance software for companies whose products run on LLM APIs. The platform is an in-path proxy: teams point their OpenAI, Anthropic, Google, xAI, Mistral and open-source model traffic at Spendline's endpoint, and every request is metered, priced, attributed to the customer that caused it, checked against budgets before it is forwarded, and written to an append-only ledger. Engineering gets real-time cost visibility and policy controls including model blocks and token caps. Finance gets gross margin per customer, hierarchical budgets across org, team, agent and customer, and a month-close workflow that reconciles calculated cost against provider invoices. Spendline does not handle procurement, invoices, cards or supplier payments.