AI companies are moving fast.

They are shipping new features weekly, automating workflows, adapting to user feedback, and scaling usage across teams and geographies. AI companies today are dealing with real-time, variable infrastructure costs from GPUs and cloud providers. As a result, usage-based pricing has become a necessity rather than a choice. Customers now expect to pay only for what they use, and per-seat pricing no longer reflects how AI products deliver value. By 2024, over 85% of AI companies had adopted some form of usage-based or hybrid pricing models.

Stripe Billing works well for traditional SaaS with fixed plans and seat-based pricing. But AI companies need real-time usage metering, flexible credit systems and feature-level controls. Conventional billing systems weren’t built to handle this level of flexibility.

That’s where Flexprice comes in. We’re building an open-source metering and billing platform for AI and agentic companies to monetize their products.

Let’s dive into the differences.

1. Metering & Usage Ingestion
   Flexprice makes it easy to track and price dynamic infrastructure workloads (tokens, GPU seconds, API calls), even at scale.
   
   

   Capability	Stripe Billing	Flexprice
   Usage event schema	❌ Strict 1:1 event-to-metric mapping	✅ Flexible schema
   Usage window aggregation	⚠️ Supports SUM and COUNT , LATEST only	✅ Supports SUM, COUNT, LATEST ,COUNT UNIQUE, MAX, ROLLING AVG and Custom agg
   Usage reset frequency	❌ Not available	✅ Supports both Cumulative (persists value acoss billing cycles) and Periodic (reset aggregation at the start of each billing cycle)
   Real-time usage visibility	❌ No event-level usage records, making it difficult to analyze usage patterns and revenue drivers.	✅ Built-in Event debugger

   
   
   

2. Pricing Model Flexibility
   Whether you’re launching new pricing, experimenting with feature-based tiers, or managing contracts across geographies, Flexprice lets you iterate without rewriting code.
   
   

   Capability	Stripe Billing	Flexprice
   Hybrid plans (fixed + usage)	❌ Workarounds needed by creating multiple subscriptions	✅ Fully supported
   Credit-based pricing	❌ Lacks essential prepaid credit features, including real-time credit balance, rollover, overage and non-monetary credit support.	✅ One-time and recurring credits
   Multiple Billing period in single subscription	❌ All items in a subscription must share the same billing cycle.	✅ Mix and match annual subscriptions with monthly pay-as-you-go billing in a single contract.
   Bulk Pricing updates	❌ Bulk pricing updates are not supported, requiring custom scripts for migrations.	✅ Roll out global updates while preserving custom discounts and terms.
   Entitlements	❌ No support for plan-level feature access management.	✅ Fully supported
   Multi-dimensional pricing (region, tier, resource)	❌ Can’t charge by multiple variables without clunky workarounds.	✅ Fully supported
   Usage-based billing	⚠️ Supports aggregation and Invoice generation at the end of Billing period only leading to unpredictability and revenue loss	✅ Supports real-time aggregation and Invoice generation for better predictibility
   Add-ons, bundles, plan overrides	⚠️ Manual setup	✅ Customize pricing and discounts for specific contracts without hacks or custom logic.
   Discounts, tiers, rollover logic	⚠️ No built-in support for complex discounts, multi-year commits, or negotiated pricing terms for enterprise customers.	✅ Flexible and programmable
   Subscriptions	✅ Fully supported	✅ Fully supported

   
   

3. Invoicing & Financial Accuracy
   
   

   Capability	Stripe Billing	Flexprice
   Invoice detail granularity	⚠️ Supported at product level	✅ Custom line-items with breakdowns based on features and their pricing tears
   Backdated adjustments	❌ Not available	✅ Fully Supported
   Raw exports & auditability	❌ Hidden behind Stripe Sigma	✅ Supports export of all features, aggregation calculations for transparency to the users

   
   

4. Payment Infrastructure
   
   

   Capability	Stripe Billing	Flexprice
   Payment provider support	❌ Stripe-only	✅ Works with Stripe, Razorpay, PayPal, etc.
   Bring-your-own-invoicing	❌ Tied to Stripe only	✅ Yes

   
   

5. Developer Experience & Extensibility
   
   

   Capability	Stripe Billing	Flexprice
   Open-source	❌ Closed	✅ Fully open-source
   Capability to self-host	❌ No	✅ Yes
   Embeddable widgets	⚠️ Limited checkout page	✅ Pricing page, customer portal, usage UI
   Multi-tenant support	⚠️ One Stripe account per tenant	✅ True multi-tenant by design