“Will my API crash when 1000 users hit it simultaneously during peak hours?”
“How do I know if my payment endpoint can handle the morning rush without spending thousands on load testing tools?”
“Why did our API work perfectly in testing but fail easily in production?”
“What will my Customer Experience (CX) be if 5000 users use my application at the same time?”
If you’ve ever asked these questions as a developer, tester, SDET, or product manager, you’re not alone. After analyzing hundreds of forum discussions, Stack Overflow questions, and Sub-Reddit, we’ve found that API load testing is broken for most teams—and it’s not your fault.
Research shows that “increased demand for speed of delivery is the #1 challenge teams face when delivering high quality APIs”, yet traditional load testing tools slow teams down with their complexity.
APIs that pass your regular load tests often fail in production because:
✅ Real users don’t make requests in straightforward, predictable patterns
✅ Mobile apps have network delays and retry logic
✅ Frontend applications usually batch requests differently than test scripts
✅ Geographic distribution affects latency and connection patterns
We have a solution
Load/Performance Testing Reimagined
We built Virtual User Balance to solve these exact problems—based on real feedback from developers, testers, and product managers who were frustrated with existing solutions.
Test Your APIs Like Real Users, Who Actually Use Them
Unlike other tools that create artificial load patterns, VUB simulates realistic user behavior
Simulate up to 5,000 concurrent users easily!
How VUB Works:
Individual User Wallets: Instead of sending same requests, VUB simulates a good user profile within your workspace. Each user instance operates with its own unique “wallet”: a dedicated allocation of credits.
Your Free Monthly Credits: A generous pool of credits is available to each month. These can be allocated across projects or used with pre-defined templates on our platform.
– Paid (Private) wallet – Opportunity to buy more as needed, and its up to the user’s discretion to use them at all their workspaces.
-Team wallet – procure Virtual Users for a team to use
-Easily transfer users between wallets
Test Scenarios, Not Just Stress: You define interesting and relevant test scenarios – “simulate 300 users browsing products and adding them to carts for 15 minutes,” “test transaction flow success under livestock updates,” etc.
Each workspace you create has a “wallet” where you can use its credits to cover costs and make things easier.
Distributed Smart Engine: Our backend runs a distributed engine optimized for handling thousands of concurrent wallet-based user sessions, ensuring realistic isolation and load ramping.
Balanced Visibility: Monitoring isn’t just about averaging; it provides granular metrics per transaction group, transaction success percentage, latency distributions, and resource breakdowns driven by the “wallet” concept.
How to use it?
Once your API collection is ready, create a test suite to test them together.
Next, select them and click on executing performance tests.
As you can see in the image below, based on the number of threads you choose, you can see the number of users you consume.
Once selected, click on execute.
Get detailed analysis and breakdown for each user you selected
For a better experience, check the number of users available in your wallet and use it as you please.
To get started, all users get 100 free virtual users, and the best part. You can buy more Only if you need it.
For Pro plan users, you get 500 per month
Key Benefits of Our Virtual User Balance System:
✅ Meaningful Metrics, Not Raw Counts: VUB provides intelligence. You gather data on transaction success rates, resource impact, and stability. You finally can ask, “Does my integrated rate-limiting handle this wave correctly?” or “Under sustained, realistic load, am I seeing frequent database connection failures?”
✅ Real User Simulation: Allow actual API calls (GET, POST, PATCH) using natural flows like user authentication, context-dependent data retrieval, and transaction processing chains.
You can track relevant metrics when users fail or get blocked, not just in specific conditions involving complex state interactions.
✅ One Test Machine for Thousands: Forget requiring dedicated hardware per user batch. Our distributed system intelligently routes and services thousands of virtual users from a single test machine.
Plus, the peace of mind knowing tests will run smoothly.
✅ Accessibility & Zero Upfront Costs: Start small. You’re given a free pool of monthly credits valued at several thousand interconnected requests – importantly, enough to conduct many locally meaningful tests without breaking your operational budget. Scale only when needed.
✅ Actionable Insights: If you test API functionality within complex workflows like order API transactions, user API onboarding, or policy APIs controls, the outcome is clear with detailed summary reports that pinpoint weaknesses.
Getting Started with Virtual User Balance
Ready to test your APIs like no other tools now possible?
Virtual User Balance is now available. Experience the future of API load testing—realistic, affordable, and designed for modern development teams.
