AI products from calendars to design tools increasingly rely on usage‑based billing to match revenue with consumption. Teams struggle when dozens of models and thousands of customers require per‑token pricing. Blnk offers a single‑source‑of‑truth ledger that records both tokens and dollars together, eliminating mismatched balances and overcharges.

First, developers create a ledger folder via Blnk’s API and then a wallet for each client, such as the example “Xavier Woods”. Each usage event triggers an atomic write: the token count debits the customer’s wallet while the equivalent USD credits a revenue account. Bulk‑transaction endpoints ensure double‑entry accounting stays immutable.

Integrating the OpenAI TypeScript SDK lets services capture input and output token usage, apply model‑specific rates, and compute the USD charge. Teams can choose prepaid wallets that block usage on insufficient funds or postpaid overdrafts that settle at period end. Watching how the ledger scales across multiple LLMs will dictate future audit and pricing refinements.