Use cases

14 AI spend problems, and how Spendline handles each one.

Each page names the problem the way teams run into it, explains the mechanism with one labelled sample, and says what to know before relying on it.

How to track AI cost per customer
Provider reports group usage by model, project or API key. Your application supplies the customer and workflow context needed to see cost per account.
How to see margin after AI cost, per customer
Customer revenue minus attributed AI cost, over the same period, where you share revenue data. Other delivery costs are not included.
How to prevent an AI agent from exceeding its budget
An agent loop can spend a month of budget in an afternoon. The check has to sit before the call, and it works from an estimate.
How to cap one AI agent's spend at a fixed amount per month
Example: a monthly limit for one agent, without touching any other agent's budget, and a clear choice between monitoring and strict enforcement.
How to set one spending cap across OpenAI and Anthropic together
OpenAI's own spend limits see only OpenAI. A shared cap has to live somewhere both providers' traffic passes through.
How to track OpenAI and Anthropic spend by customer, across providers
Two providers, one customer. Provider reports group usage by model, project or API key; the customer has to come from your application.
How to restrict which AI models one workflow can use
Not every model in your stack should be reachable from every workflow.
How to cap tokens per API call
One unbounded request can turn a cheap workflow into an expensive one.
How to test a cheaper model without rewriting your application
A cheaper model is only a saving if it still does the job. Reroute rules let you test that without changing application code.
How to keep AI spend records finance can work from
A cost table that gets edited when someone finds a mistake is hard to reconcile. Corrections should be new entries.
How to compare AI spend with the provider invoice
Your records say one total, the provider invoice says another. Spendline records the difference; explaining it is still your team's work.
How to detect a runaway AI agent before it burns your budget
A strict budget refuses calls at the limit. Detection can flag unusual spend earlier, but it alerts rather than blocks.
How to bill customers for their AI usage
Usage-based billing for AI features needs an attributed cost per customer as one of its inputs.
How to allocate AI cost to teams or cost centres
Finance wants AI spend broken out by cost centre like every other line. That needs a label on each call.