TokenLine is the live spend meter and signed ledger for every autonomous agent you run.
It names every token, caps every agent, and proves every dollar — in the request path, before the invoice arrives.
An autonomous agent spends on its own judgment — it spawns, retries, and loops while you sleep. TokenLine caps every agent before the call is billable, names every token to the agent that spent it, and signs a receipt you can defend. Two lines of code.
TokenLine runs as a transparent proxy in front of any AI provider. In the request path, before a call is ever billable: per-agent hard caps, circuit breakers that halt runaway loops, real-time attribution, and a cryptographically signed ledger — unified.
Wire one agent →TokenLine wraps any AI API — OpenAI, Anthropic, Google, Cohere, Mistral, Groq, Together, Replicate, or your own self-hosted models. No lock-in. One unified cost view.
Every token attributed to the exact agent, sub-agent, task, customer, and outcome that spent it — in real time, not reconstructed three weeks later from a provider bill. Cost tied to behavior, the unit the agentic era actually runs on.
Per-agent, per-task, per-day hard budgets enforced at request time. A runaway loop hits its ceiling and halts with an HTTP 402 — before the call is ever billable. Enforcement before spend, not an alert on day 28.
A cryptographically signed ledger of every dollar — which agent, on whose authority, for what result. When finance, an auditor, a customer, or a court asks what your agent spent the money on, you have an answer you can defend. Not a dashboard. A receipt.
The first 1,000 who connect a real workload keep the founding rate forever — and get the Overspend Guarantee: if TokenLine doesn't catch more waste than it costs in your first 30 days, it's free, and we refund the gap up to one month's price.
// Two-line install · No card · Founding 1,000 open
Three ways an agent burns you
while you sleep.
An agent re-fires on every transient failure. Each call is cheap. Ten thousand overnight is a month's budget — and it's invisible in the aggregate provider bill until it's three weeks too late.
A reasoning loop that doesn't know when to stop. Model call, vector lookup, tool call, repeat — each one cheap alone, lethal in aggregate. Cost emerges from the agent's behavior, not your traffic.
An agent spawns sub-agents that spawn sub-agents. One never gets capped. It runs all night on your key, and in the morning the only record is a number on a provider dashboard with no name attached.