Lago Has a Free Billing Engine — Usage-Based Pricing Without Building It Yourself

Lago is an open-source billing engine for usage-based and subscription billing — metering, invoicing, and payments.

What You Get for Free (Self-hosted)

• Usage metering — ingest events, aggregate by any dimension
• Subscription plans — recurring billing with tiers
• Add-ons — one-time charges on top of subscriptions
• Coupons — percentage or fixed-amount discounts
• Invoicing — automatic PDF invoice generation
• Tax management — tax rates per customer/plan
• Webhooks — invoice.created, payment.succeeded events
• API-first — RESTful API for all operations
• Multi-currency — bill in any currency

Quick Start

git clone https://github.com/getlago/lago.git
cd lago && docker compose up -d
# Dashboard at http://localhost

# Ingest usage events
curl -X POST https://api.getlago.com/api/v1/events \
  -H 'Authorization: Bearer YOUR_KEY' \
  -d '{
    "event": {
      "transaction_id": "txn_123",
      "external_customer_id": "customer_1",
      "code": "api_calls",
      "properties": { "tokens": 1500 }
    }
  }'

Why Developers Switch from Stripe Billing

Stripe Billing wasn't designed for usage-based models:

• Real-time metering — ingest millions of events
• Flexible pricing — graduated, package, percentage tiers
• Open source — no per-invoice fees, self-hosted
• Multi-model — usage + subscription + one-time in one system

A SaaS spent 6 months building custom billing for their API (metering, aggregation, invoicing). After Lago: same functionality, 2-day integration, zero maintenance.

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