Billing infrastructure for modern SaaS

Usage-based billing and webhooks for serious SaaS teams

Track events, meter usage, price accurately, generate invoices, and stream reliable webhooks without stitching together five systems.

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Event latency

< 200ms

Multi-tenant ready

Org scoped

Event-driven architectureMulti-tenant isolationSigned ingestion keys
Usage event ingestionPOST
POST /api/track
x-usageflow-api-key: uf_live_***

{
  "metric": "API_CALL",
  "amount": 1000,
  "customerId": "user_123"
}
Webhook payloadPOST
{
  "type": "invoice.created",
  "data": {
    "invoiceId": "inv_123",
    "amount": 1200
  }
}

What is UsageFlow

A billing and event platform designed for real workloads

UsageFlow helps product teams meter consumption, apply pricing rules, generate invoices, and notify downstream systems using reliable webhook delivery.

It is built around operational correctness: async processing, observability, retries, and auditable state transitions.

How it works

From event ingestion to external delivery

UsageFlow follows a predictable, event-driven lifecycle built for reliable billing operations.

01

Ingest usage

Applications send signed usage events with API keys and structured metadata.

02

Price and aggregate

Background jobs aggregate usage and apply plan-level pricing and overage rules.

03

Generate invoices

Billing cycles close into invoices with transparent line-item calculations.

04

Deliver webhooks

Events are persisted and delivered to external endpoints with retries and logs.

Key features

Built to mirror production SaaS billing systems

Multi-tenant isolation

Organization-scoped data and role-based access controls across every workflow.

Flexible pricing engine

Define metrics, plans, and overage rules to model real usage-based pricing.

Secure ingestion

Usage events are authenticated with API keys and validated before processing.

Background processing

Aggregation, invoicing, and delivery workflows run reliably in workers.

Reliable webhooks

Event retries, endpoint controls, and delivery logs keep integrations dependable.

Audit visibility

Critical actions and delivery outcomes are recorded for operational traceability.

Architecture and reliability

Event-driven by design, built for operational safety

UsageFlow separates event creation from downstream side effects so billing-critical jobs can be retried and observed independently.

The system design mirrors practical SaaS patterns where correctness, durability, and external integrations matter as much as UI.

  • Durable event storage for critical workflows
  • Background workers with controlled retries
  • Delivery logs and audit trails for visibility
UsageFlow system architecture

Explore UsageFlow in action

Open the dashboard to experience the full workflow, or inspect the source to understand implementation details.

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