The pay-as-you-go model: how to control and monitor expenses

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In this article, you will learn:

• What the pay-as-you-go model is
• How the pay-as-you-go model works in cloud-based ERP systems
• What tools are available for controlling costs in a pay-as-you-go model
• What effective cost management looks like in practice

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Paying only for the resources actually used is the most effective way to eliminate waste in your company’s technology budget. A modern cloud-based ERP system operating on a pay-as-you-go model allows for dynamic infrastructure scaling, eliminating the risk of overpaying for unused licenses. However, effective cloud cost management requires implementing real-time expense monitoring tools to avoid bill shock during sudden spikes in demand. Learn how to combine high operational performance with full financial control through proven optimization strategies.

What is the pay-as-you-go model?

The pay-as-you-go model is a billing method where the user pays only for the actual consumption of resources or services. It is currently one of the most popular payment models in cloud services, primarily due to its flexibility, which makes it one of the potential development directions for ERP systems and other industries. The customer pays only for what they have actually used, so they can not only avoid overpayment or underpayment but also dynamically scale resource consumption to current needs. The pay-as-you-go model does not involve large initial capital expenditures, so it is no surprise that it is also used in contexts other than cloud computing – it is used in energy, telecommunications, and transport services (companies like Bolt or Lime use it). The advantages have already been mentioned – this model is transparent, easy to understand, and does not involve hidden fees. However, this does not mean it is a perfect model – it not only requires constant monitoring of resource consumption (in the case of the cloud, this could be disk space) but can also lead to unforeseen expenses. Why? Imagine a situation where a company needs a terabyte of disk space, which might cost 10 PLN in a subscription model, but if it is billed in a pay-as-you-go model where a gigabyte of space costs 0.15 PLN, it will pay 15 PLN for the same space. It should also be remembered that discounts and rebates, which subscription holders can often count on, are rare in this billing method.

Monitoring resources and expenses in real time

Every company using an ERP system wonders from time to time – how to improve its performance? How do you do this when using a cloud ERP and a pay-as-you-go billing model? The solution is simple: monitor resources and expenses in real time, although monitoring pay-as-you-go expenses can be quite demanding. How can both processes be simplified? First, you need to collect as much data as possible. Whether it concerns CPU usage, RAM, or data transfer, it should be collected automatically from every system or device, and the company should collect as much as possible. This way, you can not only accurately calculate how high the bill will be but also find areas for improvement. Second, you need to ensure real-time data processing, and it is best to set up alerts that trigger when consumption or expenses exceed a set limit. Integrating ERP with tools such as AWS CloudWatch, Microsoft Azure Monitor, or Google Cloud Operations is a good solution. You can also use open-source solutions such as Datadog, Grafana, or Prometheus. Third, periodic reports are important – daily, weekly, monthly, quarterly, and annual. Some trends only become visible over long periods, but every report can be the basis for optimizing resource consumption. By monitoring data usage in real time, you can avoid unexpected bills and adjust system performance on an ongoing basis.

Tools for controlling costs in a pay-as-you-go model

So how do you control resources and monitor expenses in a pay-as-you-go model? Monitoring tools, especially those built into popular cloud platforms, can help. Focusing only on the big three cloud providers, we can distinguish:

• AWS Cost Management and AWS Budgets, which are used to monitor consumption and expenses, as well as set budgets on the Amazon Web Services platform.
• Microsoft Azure Cost Management and Billing used in Microsoft solutions; with their help, you can, for example, optimize expenses thanks to recommendations regarding turning off unused resources.
• Google Cloud Billing is a monitoring solution in Google Cloud that includes, for example, the Recommender tool – it helps with resource optimization (e.g., reducing instance size).

For multi-cloud solutions, applications like Spot.io and CloudHealth will be helpful – they not only allow you to analyze expenses across multiple platforms but can also help with automatic cost optimization. There are also tools for controlling costs in a pay-as-you-go model in solutions other than cloud computing – an example is the energy industry, where “smart” meters are increasingly being used to monitor electricity, gas, or water consumption in real time, and based on this, they can, for example, send notifications about high consumption to a special application. In these apps, you can also set up the use of dynamic tariffs and pay less, for example, for consumption at night when demand is lower.

Examples of effective on-demand cost management

Effective cost management in an on-demand model can be illustrated by the example of an e-commerce company that uses AWS to handle seasonal traffic spikes, such as Black Friday. To do this, it can use auto-scaling to launch additional instances only during peak hours, as well as use reserved or spot instances (cheaper, low-priority instances) during low-load periods. This way, it can reduce its costs. You can also look at a marketing agency using SaaS data analysis tools. In their case, costs can be optimized by reviewing subscriptions and switching to lower-tier user plans (e.g., only for active employees), as well as disabling paid but rarely used features. From this, a general lesson can be drawn: conduct a license audit every quarter, as this is how you can detect unused ones. Looking for examples outside the technology industry, you can look at fleet management in a rental model – imagine a courier company that uses van rental services in a pay-as-you-go system. To reduce costs, it can rent vehicles only when there is a real need (e.g., during holiday periods), and it can also optimize routes using tools such as Google Maps API or Route4Me. And what are some general tips for monitoring pay-as-you-go expenses? It is good to rely on automatic alerts for excessive resource consumption, regularly analyze resource usage, and set budget limits with the help of cost forecasting tools. This way, you can save money while maintaining high performance.