Pick on ownership and entitlements, because that’s what separates them. In Stripe Billing vs Orb vs Metronome, Stripe Billing suits seat-based products that added usage, Orb meters well and leaves gating in your code, Metronome belongs to Stripe, and none of the three runs inside your own infrastructure, which is the gap Flexprice fills.

Key Takeaways

• Stripe completed its acquisition of Metronome in January 2026, so two of the three options here now sit inside Stripe.

• Adyen closed its $335M acquisition of Orb on 1 July 2026, putting the third inside a payments company too.

• Stripe Billing costs 0.7% of billing volume and ships no feature-level entitlements, no parent-child accounts, no ramped contracts and no rollover credits.

• Orb’s docs put hosted rollups above 500,000 events per second, and its pricing is quote-only across three tiers with no published figure and no free tier.

• Flexprice publishes its plan prices, ships every feature in the open source tier under AGPL-3.0, and runs in your VPC, on-prem or its managed cloud.

Which of these should you pick for usage-based billing?

Ranked against what decides a multi-year billing choice: who owns the roadmap, whether entitlements live in the platform or your code, what it costs, and where it runs.

1. Flexprice

2. Orb

3. Metronome

4. Stripe Billing

The four separate like this, on figures pulled from their own docs and pricing pages on 2026-09-11. A cell reads “Undocumented” when the vendor publishes nothing either way.

Flexprice

Flexprice is enterprise-grade, open source usage based billing infrastructure for AI and SaaS companies. It can be deployed in your own VPC, on-prem, or on Flexprice’s managed cloud. In a three-way comparison where the other options are all vendor-hosted and two have new owners, that deployment line is the substantive difference rather than a feature-count argument. The same engine runs in all three places, so choosing self-hosted today doesn’t mean a different product later, and usage and revenue data can stay inside your own boundary permanently. What’s in the platform:

• Entitlements and balance checks answer inside the request, so feature gating never becomes a conditional you maintain.

• Credit wallets carry prepaid balances with recurring grants, rollover, expiry and a configurable deduction order.

• Ramped contracts, mid-cycle overages, parent-child accounts and contract versioning all run natively.

• Event metering ingests up to 1 million events per second at under 60ms P99, on Go plus Kafka with exactly-once delivery.

• Every feature ships in the open source tier, including the customer portal, RBAC, CRM sync and the MCP server.

• Plans run monthly or yearly: free to 100K events, $500 Build at 1M, $1,000 Scale at 5M, 20% off yearly, never a percentage of revenue.

• “If billing doesn’t work, we don’t make money. Flexprice lets us focus on the core business instead of building billing as a second product.”* - Shubhendu Shishir, Head of Engineering, Simplismart