Frontier AILago has been able to follow the pace of our releases and has allowed us to focus on what we do best.
Usage Metering
Meter usage in real time. Bill it without the headaches.
Lago is the open-source billing platform that gives engineering and finance full control over any usage-based model. Event-driven metering, hybrid pricing, self-hosted or cloud.
Lago meters input, output, and cached tokens in real time. Usage events from sources such as OpenAI, Anthropic, Google Gemini, Mistral, Ramp Router, Snowflake Cortex, Databricks, Cloudflare, AWS Kinesis, Amazon S3, Google Cloud, Redis, and Azure stream into one chart showing 1.2 million tokens. An events feed lists each metric as it arrives, at rates between 100 and 50,000 events per second.Real-time metering
and usage-based billing
at scale.
Capture usage from every source that drives your product, from HTTP APIs and streaming connectors to AI gateways and the LLMs behind them. Lago brings events from Kafka, Kinesis, S3, GCP, Redis, Azure, and more into one real-time metering flow. Track credit drawdown as it happens, apply usage-based pricing at scale, and keep every charge visible from the first event to the final invoice.
AI gateways & LLMs
- OpenAI
- Anthropic
- Google Gemini
- Mistral
- AWS Bedrock
- Ramp Router
- Snowflake Cortex
- Databricks
- Cloudflare
- More
API & streaming
- HTTP
- Kinesis
- S3
- Kafka
- GCP
- Redis
- Azure
- More
Lago
Usage meteringBilling
Ready for billing
- Invoicing
- Real-time credit balances
- Usage reports
- Taxes
- Analytics
- Revenue Recognition
- Alerts
- Governance
Capture your usage
Send events from your application with the API or a Lago SDK.
Define what counts
Aggregate events into billable metrics, from API calls to compute hours.
Choose your pricing
Combine usage charges, subscriptions, and prepaid credits in your plans.
Turn usage into invoices
Apply each customer’s plan to their usage and generate their invoice.
Ingest usage at scale from any source
Bring usage from HTTP APIs, event streams, and LLM gateways into Lago. Connect sources such as Kafka, Kinesis, and your AI stack to ingest usage at scale and turn it into billable metrics.
Turn raw usage data into accurate invoices
Lago ingests raw usage data and converts it into charges. Aggregate events in real time to ensure your billing doesn’t miss a beat.
Bill usage at any scale
Bill as many products as you want and ingest up to 1M events per second.
Adapt pricing on the fly
Both non-engineers and engineers can update usage charges via API or Lago’s no-code UI.
Usage-based billing is easy now
Everything you need to bill for usage.
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 AIUsage Metering FAQ
What is usage metering?
ToggleUsage metering captures product consumption, an API call, a token, a compute-minute, as an event, then aggregates those events into a number billing can charge for. In Lago, every event carries a code that maps to a billable metric, a transaction_id for deduplication, and a subscription reference, and events arrive through the REST API, batch API, streaming connectors, or an S3 backfill.