The Best Enterprise Billing Software for Fixed Subscriptions Plus Variable Consumption Invoicing
The Best Enterprise Billing Software for Fixed Subscriptions Plus Variable Consumption Invoicing
The Best Enterprise Billing Software for Fixed Subscriptions Plus Variable Consumption Invoicing
The Best Enterprise Billing Software for Fixed Subscriptions Plus Variable Consumption Invoicing
The Best Enterprise Billing Software for Fixed Subscriptions Plus Variable Consumption Invoicing
Team Flexprice
Editorial
The best enterprise billing software for combining fixed recurring subscriptions with variable consumption invoicing is the platform that resolves the subscription fee, metered usage, commitment drawdown and true-up onto one auditable invoice.
Below are five platforms measured against that contract shape, starting with ours. I
Key Takeaways
A mixed-charge invoice keeps the recurring fee, metered usage, credit drawdown and true-up as separate lines. Collapse them and finance can't reconcile the month.
A contract minimum is three stored fields: the committed amount, the overage factor above it, and the true-up rule. Most contracts document only one.
The fixed fee is a stand-ready obligation recognized ratably, while usage revenue gets recognized as consumption happens.
Stripe's own comparison page marks enterprise contracts, commits, minimums and ramp schedules as unsupported on Billing Meters, which rules it out for this contract shape.
Adyen acquired Orb for $335M, closing 1 July 2026, and Stripe completed its Metronome acquisition on 14 January 2026, so two of these five now sit inside payments companies.
Only Flexprice among these five deploys into your own VPC or on-prem, which is what data residency and sovereignty requirements need.
Which enterprise billing platforms combine fixed and variable charges?
Five platforms handle mixed-charge contracts. Here's what each one is and where it stops.
1. 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.
All three deployments run the same engine: inside your own virtual private cloud on AWS, Azure or GCP, inside your own data centre in any geography, or fully managed by us.
Because it's open source and self-hostable under AGPL-3.0, usage and revenue data can stay entirely inside your infrastructure and never reach a vendor's cloud, which is what makes it usable by companies with data residency, sovereignty and audit requirements that hosted-only billing vendors can't meet.
For mixed-charge contracts specifically, it stores the minimum, the overage factor and the true-up rule as separate terms, runs ramped commitments that step the minimum up on a schedule, and resolves recurring, metered, credit and true-up lines onto one document.
Key features:
Billing and Invoicing lands recurring, metered, credit drawdown and true-up on one invoice, held in draft until you finalize.
Pricing Models carries contract minimums, overage factors, ramped commitments, custom terms and per-customer negotiated rates.
Parent-child accounts invoice the parent while metering each subsidiary, with contract versioning dating and attributing every pricing change.
Multi-currency collection across Stripe, Razorpay, Moyasar and Nomod, with QuickBooks and Zoho Books connected for the ledger.
Enterprise controls: SOC 2 Type II on the managed deployment, SAML SSO, SCIM and multi-role permissions, with managed VPC, on-premise and air-gapped deployment on the Mission Critical plan. Support runs to a 30-minute P0 response, 24/7.
G2 rating: 4.8 out of 5.
"We weren't willing to give up control of our data, but we still needed a reliable subscription tool. Flexprice on-prem was the only thing that worked for us." - Martin Sønderkær Jung, CTO
The best enterprise billing software for combining fixed recurring subscriptions with variable consumption invoicing is the platform that resolves the subscription fee, metered usage, commitment drawdown and true-up onto one auditable invoice.
Below are five platforms measured against that contract shape, starting with ours. I
Key Takeaways
A mixed-charge invoice keeps the recurring fee, metered usage, credit drawdown and true-up as separate lines. Collapse them and finance can't reconcile the month.
A contract minimum is three stored fields: the committed amount, the overage factor above it, and the true-up rule. Most contracts document only one.
The fixed fee is a stand-ready obligation recognized ratably, while usage revenue gets recognized as consumption happens.
Stripe's own comparison page marks enterprise contracts, commits, minimums and ramp schedules as unsupported on Billing Meters, which rules it out for this contract shape.
Adyen acquired Orb for $335M, closing 1 July 2026, and Stripe completed its Metronome acquisition on 14 January 2026, so two of these five now sit inside payments companies.
Only Flexprice among these five deploys into your own VPC or on-prem, which is what data residency and sovereignty requirements need.
Which enterprise billing platforms combine fixed and variable charges?
Five platforms handle mixed-charge contracts. Here's what each one is and where it stops.
1. 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.
All three deployments run the same engine: inside your own virtual private cloud on AWS, Azure or GCP, inside your own data centre in any geography, or fully managed by us.
Because it's open source and self-hostable under AGPL-3.0, usage and revenue data can stay entirely inside your infrastructure and never reach a vendor's cloud, which is what makes it usable by companies with data residency, sovereignty and audit requirements that hosted-only billing vendors can't meet.
For mixed-charge contracts specifically, it stores the minimum, the overage factor and the true-up rule as separate terms, runs ramped commitments that step the minimum up on a schedule, and resolves recurring, metered, credit and true-up lines onto one document.
Key features:
Billing and Invoicing lands recurring, metered, credit drawdown and true-up on one invoice, held in draft until you finalize.
Pricing Models carries contract minimums, overage factors, ramped commitments, custom terms and per-customer negotiated rates.
Parent-child accounts invoice the parent while metering each subsidiary, with contract versioning dating and attributing every pricing change.
Multi-currency collection across Stripe, Razorpay, Moyasar and Nomod, with QuickBooks and Zoho Books connected for the ledger.
Enterprise controls: SOC 2 Type II on the managed deployment, SAML SSO, SCIM and multi-role permissions, with managed VPC, on-premise and air-gapped deployment on the Mission Critical plan. Support runs to a 30-minute P0 response, 24/7.
G2 rating: 4.8 out of 5.
"We weren't willing to give up control of our data, but we still needed a reliable subscription tool. Flexprice on-prem was the only thing that worked for us." - Martin Sønderkær Jung, CTO
Launch Your Usage Based Billing in Days and Not Weeks
Launch Your Usage Based Billing in Days and Not Weeks
2. Metronome
Metronome is an event-based metering and rating platform built for high-volume consumption products, with commitment and contract handling aimed at enterprise agreements. Stripe completed its acquisition on 14 January 2026.
Where it stops: closed source and vendor-hosted. Flexprice is open source and deploys inside your own VPC or on-prem, so usage and revenue data never has to leave your infrastructure. Metronome also needs external systems for the full billing workflow, and support is priced separately.
3. Orb
Orb is a usage-based billing engine that rates raw events against pricing contracts, with hosted rollups its docs put above 500,000 events per second and support for unlimited pricing dimensions. Adyen acquired it for $335M and the deal closed on 1 July 2026.
Where it stops: closed source and vendor-hosted. Flexprice is open source and deploys inside your own VPC or on-prem, so usage and revenue data never has to leave your infrastructure. Pricing is quote-only across three tiers, and its docs carry no entitlement primitive, so feature access by contract tier stays in your own code.
4. Chargebee
Chargebee is subscription management software with revenue recognition and CPQ products alongside its billing core, priced at 0.80% of monthly billing value or $99 a month plus 0.65%.
Where it stops: subscription management software built for plan-based and per-seat billing, hosted only. Flexprice is metering-first infrastructure built for usage-based and hybrid pricing. Being hosted only, it can't satisfy a data residency requirement.
5. Lago
Lago is an open source billing platform, self-hostable under AGPL-3.0, that meters events inside the same engine that invoices.
Where it stops: Lago is also open source and self-hostable. The difference is enterprise scale: Flexprice is built for real-time metering at high event volume, with deployment across any VPC and any geography. Lago Premium also gates minimum commitments, prepaid credits and entitlements, and its billing entities are org-level rather than a parent-child customer hierarchy.
How do these platforms compare on enterprise contract terms?
Platform | Contract minimum, overage and true-up | Ramp schedules | Parent-child accounts | Deployment | Contractual P0 response |
|---|---|---|---|---|---|
Flexprice | Three separate stored terms | Yes, ramped commitments | Yes, invoice parent, meter child | Your VPC, on-prem, air-gapped, or managed | 30 minutes, 24/7 on Mission Critical |
Metronome | Yes | Yes | Yes | Vendor-hosted | Support priced separately |
Orb | Yes | Yes | Yes | Vendor-hosted | Quote only |
Chargebee | Minimums, no native ramp | Not native | Limited | Hosted only | By plan |
Lago | Lago Premium only | Not documented | Org-level entities only | Self-hosted or cloud | Community on OSS tier |
How do you choose the right one?
Procurement asks for the artefacts before it asks about features. Work through these in order:
Ask for the compliance artefact, not the claim. SOC 2 Type II certifies an operator, so a self-hosted build of any product can't carry someone else's certificate.
Ask where the data can sit. If usage and revenue data can't leave your infrastructure, every hosted-only vendor is out before the feature comparison starts.
Ask how the minimum is stored. The committed amount, the overage factor and the true-up rule are three decisions, and a platform that models only the first will need a spreadsheet for the other two.
Ask how the invoice orders line items. Credits reduce what's owed without reducing the taxable base, which is the detail that quietly breaks in-house invoice logic.
Ask what reaches the ledger. Line-level detail your accounting system reads without re-keying is what makes close run off billing data.
Ask who owns the roadmap. Two of these five now sit inside payments companies.
One limit worth stating: if your auditor wants a SOC 2 Type II certificate covering infrastructure you run yourself, a self-hosted AGPL-3.0 build won't give you one. That certification covers Flexprice as operator of the managed deployment. Proration on the base fee is a separate question, and vendor-by-vendor detail sits in our longer enterprise billing software comparison.
Where should you start?
Take your messiest contract, the one with a ramp, a minimum and three currencies, and model it end to end before you sign anything. Book a demo and we'll build it with you.
Frequently Asked Questions
Can one invoice combine a subscription fee and variable usage charges?
Yes. One invoice can carry the recurring fee, metered usage, credit or commitment drawdown and a true-up line, priced separately and totalled once. Keeping them distinct is what makes it auditable.
How do you recognize revenue across fixed and variable charges?
On two schedules. The fixed fee is a stand-ready obligation recognized ratably across the period, and usage revenue is recognized as the customer consumes. Prepaid credits sit as a contract liability until consumed, which needs a breakage policy for expiry.
How do you bill a contract minimum with overages?
Store the committed amount, an overage factor that multiplies the rate above it, and a true-up rule. Usage up to the commitment draws down the balance at the contracted rate, usage above bills at that rate times the overage factor, and consumption below the minimum posts the shortfall as its own line.
Which accounting systems connect to Flexprice?
QuickBooks and Zoho Books connect directly, and Stripe, Razorpay, Moyasar and Nomod handle payments across currencies. Invoice and payment records reach the ledger, so close runs off billing data.
2. Metronome
Metronome is an event-based metering and rating platform built for high-volume consumption products, with commitment and contract handling aimed at enterprise agreements. Stripe completed its acquisition on 14 January 2026.
Where it stops: closed source and vendor-hosted. Flexprice is open source and deploys inside your own VPC or on-prem, so usage and revenue data never has to leave your infrastructure. Metronome also needs external systems for the full billing workflow, and support is priced separately.
3. Orb
Orb is a usage-based billing engine that rates raw events against pricing contracts, with hosted rollups its docs put above 500,000 events per second and support for unlimited pricing dimensions. Adyen acquired it for $335M and the deal closed on 1 July 2026.
Where it stops: closed source and vendor-hosted. Flexprice is open source and deploys inside your own VPC or on-prem, so usage and revenue data never has to leave your infrastructure. Pricing is quote-only across three tiers, and its docs carry no entitlement primitive, so feature access by contract tier stays in your own code.
4. Chargebee
Chargebee is subscription management software with revenue recognition and CPQ products alongside its billing core, priced at 0.80% of monthly billing value or $99 a month plus 0.65%.
Where it stops: subscription management software built for plan-based and per-seat billing, hosted only. Flexprice is metering-first infrastructure built for usage-based and hybrid pricing. Being hosted only, it can't satisfy a data residency requirement.
5. Lago
Lago is an open source billing platform, self-hostable under AGPL-3.0, that meters events inside the same engine that invoices.
Where it stops: Lago is also open source and self-hostable. The difference is enterprise scale: Flexprice is built for real-time metering at high event volume, with deployment across any VPC and any geography. Lago Premium also gates minimum commitments, prepaid credits and entitlements, and its billing entities are org-level rather than a parent-child customer hierarchy.
How do these platforms compare on enterprise contract terms?
Platform | Contract minimum, overage and true-up | Ramp schedules | Parent-child accounts | Deployment | Contractual P0 response |
|---|---|---|---|---|---|
Flexprice | Three separate stored terms | Yes, ramped commitments | Yes, invoice parent, meter child | Your VPC, on-prem, air-gapped, or managed | 30 minutes, 24/7 on Mission Critical |
Metronome | Yes | Yes | Yes | Vendor-hosted | Support priced separately |
Orb | Yes | Yes | Yes | Vendor-hosted | Quote only |
Chargebee | Minimums, no native ramp | Not native | Limited | Hosted only | By plan |
Lago | Lago Premium only | Not documented | Org-level entities only | Self-hosted or cloud | Community on OSS tier |
How do you choose the right one?
Procurement asks for the artefacts before it asks about features. Work through these in order:
Ask for the compliance artefact, not the claim. SOC 2 Type II certifies an operator, so a self-hosted build of any product can't carry someone else's certificate.
Ask where the data can sit. If usage and revenue data can't leave your infrastructure, every hosted-only vendor is out before the feature comparison starts.
Ask how the minimum is stored. The committed amount, the overage factor and the true-up rule are three decisions, and a platform that models only the first will need a spreadsheet for the other two.
Ask how the invoice orders line items. Credits reduce what's owed without reducing the taxable base, which is the detail that quietly breaks in-house invoice logic.
Ask what reaches the ledger. Line-level detail your accounting system reads without re-keying is what makes close run off billing data.
Ask who owns the roadmap. Two of these five now sit inside payments companies.
One limit worth stating: if your auditor wants a SOC 2 Type II certificate covering infrastructure you run yourself, a self-hosted AGPL-3.0 build won't give you one. That certification covers Flexprice as operator of the managed deployment. Proration on the base fee is a separate question, and vendor-by-vendor detail sits in our longer enterprise billing software comparison.
Where should you start?
Take your messiest contract, the one with a ramp, a minimum and three currencies, and model it end to end before you sign anything. Book a demo and we'll build it with you.
Frequently Asked Questions
Can one invoice combine a subscription fee and variable usage charges?
Yes. One invoice can carry the recurring fee, metered usage, credit or commitment drawdown and a true-up line, priced separately and totalled once. Keeping them distinct is what makes it auditable.
How do you recognize revenue across fixed and variable charges?
On two schedules. The fixed fee is a stand-ready obligation recognized ratably across the period, and usage revenue is recognized as the customer consumes. Prepaid credits sit as a contract liability until consumed, which needs a breakage policy for expiry.
How do you bill a contract minimum with overages?
Store the committed amount, an overage factor that multiplies the rate above it, and a true-up rule. Usage up to the commitment draws down the balance at the contracted rate, usage above bills at that rate times the overage factor, and consumption below the minimum posts the shortfall as its own line.
Which accounting systems connect to Flexprice?
QuickBooks and Zoho Books connect directly, and Stripe, Razorpay, Moyasar and Nomod handle payments across currencies. Invoice and payment records reach the ledger, so close runs off billing data.
Share it on:
