For usage-based pricing, I’d recommend a stack that gives you:

1. metering/invoice logic
2. payment collection
3. reliable event ingestion
4. visibility into usage and churn risk

Best default stack for most SaaS apps

1) Billing + invoicing: Stripe Billing

Use Stripe if you want the fastest path and don’t need very custom enterprise billing on day 1.

Why:

• Supports subscriptions + metered billing
• Handles invoices, proration, taxes, failed payments, dunning
• Strong API/docs and wide ecosystem
• Easy to combine base subscription + usage overages

Use it for:

• Seat-based + usage hybrid pricing
• Pay-as-you-go
• Credit packs / minimum commits
• Monthly invoicing

2) Metering/usage pipeline: Your app + event queue + warehouse

Don’t send raw usage directly from product code to Stripe as your only source of truth.

A good pattern:

• App emits usage events
• Events go through Kafka / SQS / PubSub / RabbitMQ
• Store in Postgres or a warehouse like BigQuery/Snowflake/Redshift
• Aggregate into billable usage records
• Send summarized usage to Stripe

Why:

• Reprocessing/reconciliation is easier
• You can handle deduplication, retries, late events
• You get analytics and auditability

3) Analytics/visibility: Postgres + Metabase / Looker / Mode

Track:

• Usage per customer
• Billable vs free usage
• Margins by account
• Expected invoice amount mid-cycle
• Usage spikes and anomalies

4) Tax/compliance add-on: Stripe Tax

If you’re selling internationally, this saves a lot of pain.

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If you want a more dedicated usage-billing platform

If your pricing is complex, look at:

Orb

Strong for:

• Usage-based pricing
• Complex pricing models
• Customer-specific contracts
• Entitlements/credits/commits
• Good if billing is core to your business

Lago

Open-source billing + metering

• Nice if you want more control or self-hosting
• Good for event-based usage billing
• Useful if you want to avoid too much vendor lock-in

Metronome

Good for:

• Sophisticated consumption pricing
• Large-scale billing operations
• Enterprise usage billing
• Strong for high-volume or complex finance needs

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My recommendation by stage

Early-stage startup

Stripe Billing + simple usage pipeline

• Fastest to launch
• Least operational burden
• Enough for most SaaS products

Growth stage

Stripe + a dedicated metering layer

• Add warehouse-based reconciliation
• Add customer dashboards and alerts
• Improve invoice accuracy and margin tracking

Enterprise / complex pricing

Orb or Metronome + Stripe/other processor

• Especially if you need contracts, credits, minimums, and custom pricing per customer

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A practical architecture

Product events → queue/stream
→ usage service (dedupe, validate, aggregate)
→ billing DB / warehouse
→ billing provider (Stripe/Orb/Metronome)
→ invoices + payments
→ customer portal

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What I’d choose if I were you

If you’re just starting:

• Stripe Billing
• Postgres
• SQS/Kafka/PubSub for event ingestion
• Metabase for internal reporting
• Stripe Tax if needed

If your pricing is already getting complicated:

• Orb or Metronome for billing logic
• Keep Stripe for payment collection if that fits your flow

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Key decision rule

Choose Stripe Billing if:

• You want speed
• Pricing is relatively standard
• You’re okay building your own usage aggregation

Choose Orb/Metronome/Lago if:

• Pricing rules are complex
• You need customer-specific contracts/commitments
• You want more sophisticated billing ops

If you want, I can also give you:

1. a recommended stack for your exact app type, or
2. a comparison table of Stripe vs Orb vs Lago vs Metronome.