Ryan Echternacht
Usage charges are common in SaaS and AI products, where actual usage can change quickly based on API calls, token volume, cloud computing resources, storage, or AI agent activity.
Charging every customer the same monthly subscription fee is a poor decision when product usage varies from one account to another.
With usage-based charges, your company's revenue scales with consumption. When customers use more of the product, cloud bills and profits can move in the same direction to protect gross margins.
This guide covers what usage charges mean, how they compare with other billing models, and why most SaaS and AI companies charge based on usage.
TL;DR
- Usage charges are fees tied to the amount of a product or service a customer consumes.
- SaaS and AI companies charge based on usage to connect pricing with customer value, protect margins, grow revenue as product activity increases, and support product-led growth.
- Usage-based charges work best when consumption is measurable, varies between customers, and is linked to either customer value or the cost of serving each account.
- Common types of usage charges include per-unit, tiered, prepaid, committed usage, and overage charges on top of subscription fees.
- Schematic helps software and AI companies charge customers based on usage with metering, billing, runtime entitlements, configurable spending limits, and real-time visibility into consumption.
What Are Usage Charges?
Usage charges are fees the customers pay based on the amount of a product or service they consume. The process of charging for this activity is often called usage billing or consumption billing.
Unlike a flat-fee subscription model where customers pay the same amount each billing period, usage charges require customers to pay per use. That's why monthly invoices can change based on measured activity or usage events.
In SaaS and AI products, usage charges may be tied to units like API calls, tokens, data storage, AI credits, or compute hours.
Usage-based billing is popular among software and AI businesses because it allows them to bill product consumption using virtually any metric.
Usage Charges vs. Other Billing Models
Usage charges differ from fixed or prepaid billing models because the final invoice changes with actual consumption.
Below, we'll take a closer look at different pricing structures and how they affect what customers pay for and cost predictability.
Subscription Charges
Base subscription charges are fixed recurring fees that customers pay for access to the product.
Most teams offer multiple subscription plans, with each pricing tier having a different level of functionality, limits, or support.
Customers can easily predict costs because the fee usually stays the same at the end of the billing period.
Usage charges are different because the bill changes with actual consumption. A customer who uses more of the product pays more, while a light user pays less.
Subscription charges suit products with fairly steady consumption patterns. However, usage charges may be the right choice when consumption varies widely.
Usage-based billing is also a good fit when the value customers receive increases with product use.
Seat-Based Charges
Seat-based pricing charges customers based on the number of users who can access the product.
For example, a company may pay $6 per user each month for 20 employees. Their monthly invoice reflects a total amount of $120.
The bill grows when the customer adds more seats or users to their account. That makes it easy to understand and forecast spending.
In contrast, usage charges do not depend on seats. A small team (with fewer than 10 employees) can generate heavy usage, while a large business (with more than 100 employees) may use the product lightly.
The charges reflect actual usage instead of headcount. Usage billing can fit products where activity matters more than the number of users.
Credit-Based Charges
Credit-based charges refer to prepaid credits that customers purchased or credit allowances included in a subscription plan.
Prepaid credits are a core component of credit burndown pricing. They give customers a universal currency they can spend on product actions or services.
Different actions can consume varying credit amounts. For example, in an AI platform, one model inference call costs one credit, while an image generation task consumes five credits.
Credits are useful for companies offering multiple products because all functionalities can draw from a single balance. They give customers more predictability over product activity while allowing vendors to price products with more flexibility.
Meanwhile, usage charges are tied directly to raw consumption events, such as API calls, tokens, storage, or processing time. A usage meter records those units, and the customer is billed based on the amount used.
Credit-based pricing can give customers greater control over spending because they already know their balance in advance and can monitor it over time.
Why Do SaaS and AI Companies Charge Customers Based on Usage?
Here are the main reasons why SaaS companies and AI businesses charge customers for actual product usage.
Connect Pricing to Customer Value
Usage charges connect pricing and costs to the amount of value a customer receives from the product. A user with low activity pays less, while a business that relies heavily on the product pays more.
For example, an AI platform may charge for tokens processed, agent tasks completed, or API calls made. Customers who run more workflows through the product generate a larger bill because they receive more value from it.
A usage-based pricing model can also narrow the gap between what customers use and what they pay.
According to FTI Consulting, 89% of B2B SaaS vendors say a consumption model is the best way to match pricing to variable product costs.
Instead of forcing buyers into tiered pricing plans that may include unused capacity, you can charge based on measurable product activity.
Protect Gross Margins
AI and software products often have costs that increase when customers use more resources. More token processing, model calls, storage, or compute hours can cause your cloud bill to balloon.
If you still charge a flat fee for product usage while infrastructure costs rise, your gross margins can shrink.
Fortunately, usage-based billing can protect profit margins by allowing revenue to scale with expenses.
Customers who cost more to serve can be charged a higher amount. Accounts that use the product less and incur lower costs can pay a small amount.
Capture Expansion Revenue Naturally
Usage charges can turn growing product adoption into expansion revenue without requiring sales teams to intervene.
As customers send more API calls, run more AI tasks, or process more data, their bill can naturally increase with consumption.
Higher usage volume becomes a direct source of revenue growth. A user can start small and spend more as the product becomes part of daily workflows.
Consumption billing differs from fixed subscription plans where revenue may stay unchanged until the customer adds seats or upgrades to a higher tier.
With usage charges, growth can happen inside the existing account as product activity rises. SaaS companies can still use tiers, commitments, or volume discounts while letting customer consumption drive part of the account’s revenue.
Support Product-Led Growth
Charging for usage makes sense for SaaS and AI companies with product-led go-to-market strategies.
New customers can use the product without committing to a large contract. They can quickly test different features and only increase spending when adoption grows.
Buyers don't need to talk to sales reps or ask for negotiated rates. They can begin with low-risk freemium or pay-as-you-go pricing structures.
When Should You Use Usage-Based Charges?
Use usage-based charges when product consumption is measurable and closely linked to customer value or the cost to serve each account.
Usage billing works best if you sell AI agents, infrastructure, data processing, or other consumption-heavy products.
You can consider charging based on usage when:
- Actual consumption varies widely between customers.
- Your business incurs higher costs when customers use the product more.
- Buyers can clearly understand the usage unit being measured.
- Usage naturally expands as customers receive more value from the product.
- Fixed subscription fees or seat-based pricing do not reflect how much each user actually consumes.
Let's say you're an AI company that serves two customers with the same number of users but very different token or compute usage. Charging only by software access or seat can shrink margins and lower revenue.
Usage charges can reflect consumption more closely and protect gross margins. In turn, you can capture higher revenue from customers who use your product more.
Common Types of Usage Charges
Usage charges can take several forms depending on how a SaaS or AI company measures consumption and bills customers.
Per-Unit Charges
Per-unit charges are where customers pay for each unit they consume. The unit can be an API call, AI token, gigabyte of storage, compute minute, message, or another measurable activity.
For example, your SaaS business charges $0.01 per API call. A customer that makes 10,000 calls pays $100 at the end of the billing period.
It's easy to explain pricing because customers can connect each line item in the invoice to a specific amount of product activity.
Tiered Usage Charges
Tiered usage charges apply different prices as consumption moves through set usage levels.
You may charge one rate for the first 1,000 credits, a lower rate for the next 2,000, and another rate for usage above that level.
Implement tiered usage charges to reward higher consumption with lower unit prices. You can also use them to serve customers with very different usage levels under one pricing structure.
Buyers still pay based on usage, but the rate per unit changes depending on how much they consume.
Prepaid Usage Charges
With prepaid usage charges, customers pay for a set amount of consumption before using the product. The usage balance decreases when they use paid features or services.
For example, a buyer purchases $1,000 worth of prepaid usage that can be spent on API calls, compute, or other product activity.
The benefit is that the customer already knows their spending amount before consumption begins. This can reduce billing disputes.
Prepaid charges also give vendors upfront cash instead of waiting until the end of the billing period to collect payment.
Committed Usage Charges
Committed usage charges require customers to agree to a minimum amount of usage or spend over a set billing period. The commitment may apply monthly, quarterly, or annually.
For example, a customer may commit to spending at least $5,000 per month on API usage. If actual consumption stays below that amount, the customer still pays the agreed minimum amount. If usage exceeds the commitment, extra charges may apply.
This model gives vendors more predictable revenue and stable cash flow while still allowing customers to increase consumption.
It is common in enterprise contracts where customers expect better rates in return for a spending commitment.
Subscription Plus Overage Charges
Subscription plus overage pricing combines a fixed recurring fee with a set amount of included usage.
In this hybrid model, customers pay a flat subscription fee every month or year. They also pay extra when consumption exceeds the included usage allowance in their subscription plan.
For example, a Pro plan costs $49 per month and includes 100 AI credits. Any credits consumed above that limit are billed at a set overage rate.
Vendors benefit from stable recurring revenue while still capturing upside from heavy usage.
Pros and Cons of Usage Charges
Usage charges can benefit AI and SaaS companies in several ways, but they also come with trade-offs. Let's take a closer look at the benefits and downsides of usage-based charges.
Advantages of Usage-Based Charges
- Lower barrier to adoption: Customers can pay as they use the product. They can start with low usage instead of committing to an expensive subscription plan.
- Perceived pricing fairness: Buyers only pay based on what they consume. Light users are not charged the same amount as power users, which makes pricing feel fairer.
- Wider market reach: Usage-based charges can support both small businesses and large enterprises. Each customer can spend at a level that matches their activity and demand.
- Scalable revenue growth: Revenue can increase as product usage grows. Vendors can earn more from existing customers without relying on plan upgrades or new customer acquisition.
- Actionable usage data insights: Charging based on consumption provides relevant insights into which features customers use most and where activity is growing. RevOps teams can use this information to improve pricing and packaging.
- Pricing flexibility: With usage billing, you can charge a flat rate per unit or offer volume pricing when customers buy more units. You can also sell prepaid credits or bill for overage fees under a hybrid model.
Disadvantages of Usage-Based Charges
- Revenue volatility: Profits depend on customer usage. If buyers consume fewer resources than expected, your business earns less. Usage charges also make it difficult to forecast monthly or annual recurring revenue.
- Cost uncertainty: Customers may struggle to predict how much they will pay each month. The lack of control over spending makes it harder to trust usage billing.
- Billing disputes: Unexpected usage charges can lead to bill shock, especially when customers cannot clearly see how their actual usage was measured or priced.
- Gradual customer churn: Customer drop-off is harder to track because users quietly reduce their consumption instead of canceling a subscription.
- Complex billing infrastructure requirements: Companies need a reliable billing system that can track usage at scale, apply pricing rules, produce accurate charges, and enforce consumption limits inside the product.
Schematic Helps You Charge Customers Based on Usage
Schematic is a complete usage-based billing platform for AI and software companies selling to enterprise customers.
Teams use Schematic to launch usage-based pricing, meter credits, manage software entitlements, enforce usage limits at runtime, and give customers full control over consumption.
Enterprise buyers can see real-time usage, forecast spend, set per-user or per-agent limits, and configure credit top-up policies. These prevent runaway bills and unexpected access throttling.
Unlike traditional billing systems, Schematic also addresses customer trust structurally by bringing runtime entitlements, usage metering, and billing into one platform.
A single flag check can gate features and answer access questions from the same credit ledger that bills customers. Checks and meter events update in milliseconds to keep balances, limits, and usage current wherever the product reads them.
FAQs About Usage Charges
How does usage-based billing work?
Usage-based billing tracks how much of a product a customer consumes, applies the agreed pricing rules, and calculates the final charge. The bill may depend on API requests, credits, tokens, storage, compute time, or other measured units.
What are usage fees?
Usage fees are charges tied to the amount of a product or service a customer uses. Instead of paying a fixed amount, customers are billed based on product activity during a billing period.
What does a usage-based pricing model mean?
A usage-based pricing model means charging customers based on consumption. Heavy users pay more, while lighter users pay less. It is a popular software monetization model for SaaS and AI products with variable consumption patterns.
What is a consumption cost?
A consumption cost is the amount charged for the resources a user consumes inside the product. It may refer to API usage, tokens, projects, monthly active users, or another billable unit tied to product usage.