Frontier AILago has been able to follow the pace of our releases and has allowed us to focus on what we do best.
Billing & Invoicing
Billing & invoicing without the headaches
Lago calculates charges, generates invoices and connects with your payment provider.
Ava Johnson is assigned the Enterprise plan. Its subscription fee and its seats, credits, LLM input tokens, LLM output tokens and compute charges each get a 10% discount, billed monthly. Lago then issues an invoice from Quantive to VantagePoint: a $99.00 Pro plan subscription fee, 250 units of API usage overage at $0.12 and a $21.00 credits top-up, for a $150.00 subtotal. Sales tax of 8% applies to the $99.00 fee, the $51.00 of other items is exempt, and the total due is $157.92. Finally, Jake Dennison’s prepaid wallet takes four transactions in turn, each landing at the top of the activity: 15 credits invoiced, 30 credits invoiced, 100 credits purchased manually, then 45 credits invoiced. The balance moves from 1,520 to 1,530 credits.AI Billing SDK
Wrap your OpenAI, Anthropic or Bedrock client and every model call becomes a usage event in Lago.
Agent spend control
Fund agents with prepaid wallets and get alerted as balances run low, before spend gets out of hand.
x402 Payments
Let agents pay per request over HTTP 402, with each payment tied to the usage it covers.
Tools for AI agents
Connect agents to Lago through the MCP server, the CLI or the API. Each one reads and writes the same billing data.
Create a Lago plan from plan.json using the CLI:
lago plans create --input @plan.json --output jsonExample Lago JSON response for a yearly Basic plan with usage-based API charges:
{
"plan": {
"name": "Basic",
"code": "basic",
"interval": "yearly",
"amount_cents": 90000,
"amount_currency": "USD",
"charges": [
{
"billable_metric_code": "api_calls",
"charge_model": "standard"
}
]
}
}From invoice to cash.
Synced to your books.
Invoices go out with the right taxes and get paid through your provider.
Every payment syncs to your accounting and CRM.
Assign a plan
AJAva Johnsoncus_12345678910111213
PlanSelect a planEnterprise plan
Assign plan
Assign planOverride plan
Fixed recurring charges
Subscription fee
-10%Monthly
Subscription fee-10%MonthlyUsage-based chargesSeats-10%MonthlyCredits-10%MonthlyLLM Input Tokens-10%MonthlyLLM Output Tokens-10%MonthlyCompute-10%Monthly
Metered chargesCharges are fully billed, invoiced and reset at the end of each billing period.
Seats-10%MonthlyCredits-10%MonthlyLLM Input Tokens-10%MonthlyLLM Output Tokens-10%MonthlyCompute-10%MonthlyPricing and packaging.Model subscriptions, usage, seats, credits or hybrid plans, and change prices and packages without rebuilding billing.
How Lago supports complex billing
Billing is mission-critical. Lago is engineered for the realities of high-volume enterprises.
Resources
Billing is mission-critical. Lago is engineered for the realities of high-volume enterprises.
Empower all teams with usage data
Powering fast-growing AI scaleups.And global enterprises.
See how ambitious teams build and scale their billing with Lago.
Frontier AIRelated reading
How billing systems are built, compared and chosen.
- Understanding billing system software
What a billing system does, and where teams outgrow the one they have.
- Top billing platforms compared
The main options for usage-based and hybrid billing, side by side.
- Billing models explained
Subscription, usage-based, hybrid and everything between.
- Flexible billing systems
What it takes to change pricing without an engineering project.
Billing & Invoicing FAQ
Lago calculates charges from a customer's plan and billable metrics, then automatically creates and sends an invoice once the billing period closes. Invoices apply the right taxes, include usage and subscription line items together, and can go out as PDF or as XML for e-invoicing compliance, without manual assembly.