UnitPay
Billing infrastructure built specifically for AI companies — tracks usage like API calls or tokens, generates invoices, and shows margins in real time.
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Description
When a company charges customers based on how much they actually use — a certain number of AI tokens, API calls, or generated images — regular invoicing software struggles, because it's built around flat monthly fees, not usage that changes every second. UnitPay is a billing system built specifically for that kind of pricing: it counts usage as it happens, turns it into a bill automatically, and tells the company in real time whether it's actually making money on each customer once server costs are subtracted.
UnitPay meters usage events at scale (50M+ events/month claimed), handles multi-currency invoicing, and routes payments through existing processors like Stripe, Razorpay or Paddle rather than replacing them. It includes spend controls to prevent surprise bills for end customers, revenue-intelligence dashboards with churn prediction and margin/ROI tracking per customer, and a CPQ tool for negotiating custom enterprise quotes. It's SOC 2 Type II certified and GDPR-ready, and claims sub-10-minute setup with 1ms ingestion latency.
💬 Our review
The short version: UnitPay is usage-based billing infrastructure aimed squarely at AI companies charging per token or API call, with a free tier generous enough (up to $500K ARR) that most early-stage AI startups could run on it at no cost.
The free-until-$500K-ARR model is the standout detail — Metronome, Orb and Lago (the closest comparable usage-billing platforms) don't offer anything nearly that generous, typically gating real usage-metering behind paid plans from day one. That makes UnitPay a reasonable default for an AI startup that isn't sure yet what its billing needs will look like at scale. The tradeoff is that UnitPay is the newest and least established name in this specific niche — Metronome's track record (acquired by Stripe for ~$1B in January 2026) and Orb's enterprise adoption both suggest more battle-tested infrastructure for companies already past the $500K mark, where UnitPay's pricing becomes a sales conversation like everyone else's.
💰 Pricing
📊 Global score
🤖 AI-enriched data
Free: $0/month, unlimited event tracking and full features until $500K ARR. Growth: custom pricing above $500K ARR, requires consultation.
Pros
Free until $500K ARR — unusually generous for usage-based billing infrastructure
Real-time metering claimed at 50M+ events/month with 1ms ingestion latency
Integrates with existing payment processors (Stripe, Razorpay, Paddle) instead of replacing them
SOC 2 Type II certified and GDPR-ready
Cons
Newest, least-proven name versus Metronome (acquired by Stripe ~$1B) or Orb
Custom pricing above $500K ARR requires a sales consultation like competitors
No open-source or self-hosted option, unlike Lago