AI Billing
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Flexprice

Open-source usage metering and wallet-credit billing with a no-code pricing dashboard for SaaS and AI teams.

Invoice-basedOpen SourcePricing SimulationMulti-PSP
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Last verified: April 2026

Good fit if...

  • →Startups and growth-stage teams adopting usage-based or credit-based pricing who need transparent, predictable flat-fee pricing
  • →Teams that want open-source code transparency and the option to self-host without vendor lock-in
  • →Product and growth teams that need to run pricing experiments without engineering changes for each update
  • →AI and SaaS companies in the US or India market that want multi-PSP support including Razorpay and Stripe
  • →Companies needing wallet credit infrastructure and a no-code pricing console without enterprise contract complexity

Pricing

Model
Flat monthly fee by event volume tier; no revenue percentage
Free tier
Yes
Starting price
$500/month (Starter, billed monthly; $400/month billed annually)
Revenue %
None
Per customer
None
Per event
None (event volume included in tier)
Seat fees
None
Transparency
Full

Canonical scenario — 100 customers, $2K MRR, 100K events, 5 seats

Line itemCost
Platform fee$500 (Starter tier, billed monthly; $400/month billed annually)
Per customer$0
Seat fees$0
Event fees$0
Revenue %$0
Payment processingPass-through
Total / month$500 (Starter); $1,000 (Premium, if advanced credit features required)

The canonical scenario (100K events/month) fits within both the Starter and Premium event limits (10M and 25M respectively). The Starter tier ($500/month) covers core billing, usage metering, wallets, and customer portal. Flexprice does not publicly confirm whether real-time prepaid credit balance, recurring wallet top-ups, and entitlement management require the Premium tier ($1,000/month); if so, effective comparison cost is $1,000/month. Annual billing reduces these by 20%. Payment processing fees are charged by the connected PSP at pass-through rates. The open-source self-hosted version is excluded as it does not include wallet and credit features needed for a like-for-like comparison.

Technical profile

DimensionValue
Billing model
Hybrid
Usage authorization
Post-usage
No pre-authorization gate is documented. Balance monitoring uses low-balance alerts rather than per-event wallet authorization before work runs.
Usage tracking
Real-time metering + periodic invoice
Wallet architecture
First-class primitive
Wallets are documented as core infrastructure with a full lifecycle: create, top-up, auto-recharge, debit, and low-balance alerts. However, automatic usage-based debit from usage events is invoice-driven (debited via INVOICE_PAYMENT transaction), not triggered on individual event ingestion. Manual API debit is synchronous and immediate.
Multi-asset support
USD-with-labels
Payment processing
Integrated
Requires a PSP account setup. Supported PSPs: Stripe, Razorpay, Paddle, and Chargebee. Not fully open to arbitrary PSPs.
PSP agnostic
Partial
Customer portal
Drop-in
Pre-built portal URL, embeddable via iframe and generated via an API token. The portal is read-only for customers — they can view balances, invoices, and usage analytics but cannot initiate payments or self-service top-ups.
Auto top-up
Platform-configured
Merchants set the top-up threshold and amount; end customers have no self-service threshold control in the documented feature set.
Integration model
Replaces stack
Profitability analytics
Aggregate
Open source
Partial
The AGPLv3 core covers metering, invoicing, and credit systems. Advanced features (real-time prepaid credit balance, recurring wallet top-ups, entitlement management, revenue analytics) are available on paid cloud tiers.
License
Open core
Deployment
Both
Enterprise contracts
Basic
Pricing models
Per-unit, Tiered, Volume, Subscription, Hybrid (subscription + usage), Prepaid credits / wallet, Seat-based

Strengths

  • +Published, transparent flat-fee pricing starting at $500/month with no revenue percentage and a free tier for evaluation
  • +Wallet system with full lifecycle documentation — create, top-up, auto-recharge, debit, and low-balance alerts — positioned as core infrastructure
  • +No-code pricing management dashboard lets non-engineers modify pricing without code deployments or engineering tickets
  • +AGPLv3 open-source core with self-hosting on Docker Compose or AWS ECS/EKS; 3,600+ GitHub stars and active development (v2.1.3, April 2026)
  • +ClickHouse-backed real-time event metering for high-volume analytics with flexible deployment options
  • +Multiple PSP integrations — Stripe, Razorpay, Paddle, and Chargebee — suits teams in US and India markets

Limitations

  • −Automatic wallet debit from usage events is invoice-driven (INVOICE_PAYMENT transaction), not triggered atomically on each event ingestion
  • −No pre-usage authorization primitive — the platform monitors balance via low-balance alerts but cannot gate individual events before they run
  • −Customer portal is read-only — end customers can view balances and invoices but cannot initiate payments or self-service top-ups
  • −Auto top-up is merchant-controlled — end customers cannot set their own top-up threshold or amount via self-service
  • −PSP selection is limited to Stripe, Razorpay, Paddle, and Chargebee; no bring-your-own PSP model is documented
  • −Early-stage company (founded 2023) with limited publicly named enterprise customers; track record is thinner than more established billing platforms

Not ideal for

  • ×Products that need real-time pre-authorization of wallet balance before individual usage events are incurred
  • ×Teams with complex enterprise contract requirements — commitments, true-ups, multi-year deals — which are not documented in Flexprice's current feature set
  • ×Companies requiring regulated-industry compliance certifications not publicly listed by Flexprice
  • ×Teams needing customer-controlled self-service wallet top-up rather than platform-configured auto-recharge rules

Similar providers

Lago
Open-source billing platform for usage-based pricing, self-hostable under AGPLv3 with managed cloud tiers.
Invoice · Both
Orb
Enterprise usage-based billing with SQL-defined metrics, pricing simulation, and deep finance integrations.
Invoice · Cloud only
Stripe Billing
Subscription and usage-based billing tightly integrated with Stripe payments, tax, and revenue recognition.
Invoice · Cloud only

Company

Founded
2023
Headquarters
Not publicly disclosed
Funding
Seed stage; specific funding figures not publicly disclosed

Sources