---
title: Service virtualization | Qventis One
description: Simulate APIs that are down, unfinished or costly to call, from OpenAPI specs or recorded traffic, in the same plain-English steps.
---

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[Qventis One](https://qventis.ai/one?hsLang=en)/Engines/Service virtualization

Service virtualization engine

# Stop waiting on APIs that aren't ready

Simulate services that are down, unfinished or charge per call, from a spec or recorded traffic, using the same plain-English steps as your tests.

[Book a demo](https://qventis.ai/contact#demo)[See Qventis One](https://qventis.ai/one?hsLang=en)

- Unblock tests today
- No per-call sandbox charges
- Always know simulated from real

**Loan approved on a good score**Web + simulation, 5 steps

1. Simulate GET '/credit-score' returning '720'
2. Open the 'Loan application' app
3. Click the 'Submit' button
4. Check that 'Decision' shows 'Approved'
5. Check that '/credit-score' was called once

## Unblock tests waiting on a service

### It is down

A shared environment is offline or a partner sandbox is flaky. Simulate it and keep the suite green for the right reasons.

### It is unfinished

The front end is ready and the API is not. Simulate from the agreed spec and test the screens now.

### It is costly

Credit bureaus and payment gateways charge per call. Simulate them daily and call the real one before release.

## How service virtualization works

Build a simulationFrom a spec or traffic

Edge casesErrors and delays in one sentence

Simulated or realAlways know which you tested

One model, one paneShared APIs, one results view

### Start from a spec or traffic

Simulations use the same step language and editor as your tests, so there is no second tool to learn.

- From an OpenAPI spec: every path and response shape
- From recorded traffic: the responses your app actually gets, with sensitive values masked
- Tune behavior with steps: return a value, an error or a delay

[Build simulations in Studio](https://qventis.ai/platform/studio?hsLang=en)

### Hard cases made easy

A timeout or a 503 is hard to trigger on a real service. Here it is one step.

1. Simulate POST '/payments' returning status '503'
2. Simulate POST '/payments' returning '201' after 4 seconds
3. Check that the 'Retry' button is shown

[Use simulations under load](https://qventis.ai/engines/performance?hsLang=en)

### Honest evidence by stage

A pass against a simulation is useful, and it is a different kind of evidence from a pass against the real service.

- Developer and CI runs simulate unfinished and costly services
- Integration runs use real internal services and simulated third parties
- Release readiness flags any check that only passed on a simulation

[See readiness in Quality View](https://qventis.ai/one/quality-view?hsLang=en)

### Switch by environment

Simulations sit in the [App Model](https://qventis.ai/one/app-model?hsLang=en) next to the real APIs they stand in for.

- Functional, performance and data tests switch to a simulation without editing a step
- Every run records which services were simulated
- [Quality View](https://qventis.ai/one/quality-view?hsLang=en) uses that record to keep readiness honest

[Explore the App Model](https://qventis.ai/one/app-model?hsLang=en)

## Questions

Do I need a separate tool for simulations?

No. Simulations use the same step language and editor as your tests.

Can a performance test use a simulation?

Yes, so a load test doesn't run up third-party charges or hit a partner's rate limits.

## Unblock your stuck suite in one session

Bring the API that holds your tests up, and leave with a simulation your steps can use.

[Book a demo](https://qventis.ai/contact#demo)

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Qventis One is the autonomous quality platform from qventis.ai. Learn your app once. See every kind of quality in one place. Change nothing without your approval.

[contact@qventis.ai](mailto:contact@qventis.ai)

## Platform

- [Qventis One](https://qventis.ai/one?hsLang=en)
- [Qventis Engine](https://qventis.ai/engine?hsLang=en)
- [App Model](https://qventis.ai/one/app-model?hsLang=en)
- [Quality View](https://qventis.ai/one/quality-view?hsLang=en)
- [Studio](https://qventis.ai/platform/studio?hsLang=en)
- [Agent gateway](https://qventis.ai/platform/agent-gateway?hsLang=en)
- [Editions](https://qventis.ai/editions?hsLang=en)

## Engines

- [Functional](https://qventis.ai/engines/functional?hsLang=en)
- [Performance](https://qventis.ai/engines/performance?hsLang=en)
- [Security](https://qventis.ai/engines/security?hsLang=en)
- [Service virtualization](https://qventis.ai/engines/virtualization?hsLang=en)
- [Test data](https://qventis.ai/engines/test-data?hsLang=en)
- [Data & ETL](https://qventis.ai/engines/data-etl?hsLang=en)
- [Visual](https://qventis.ai/engines/visual?hsLang=en)
- [Accessibility](https://qventis.ai/engines/accessibility?hsLang=en)

## Solutions

- [Enterprise platforms](https://qventis.ai/platforms?hsLang=en)
- [Industries](https://qventis.ai/industries?hsLang=en)
- [Legacy desktop](https://qventis.ai/solutions/legacy-desktop?hsLang=en)
- [Release testing](https://qventis.ai/solutions/release-testing?hsLang=en)
- [Quality CoE](https://qventis.ai/solutions/quality-coe?hsLang=en)

## Company

- [About](https://qventis.ai/about?hsLang=en)
- [Customers](https://qventis.ai/customers?hsLang=en)
- [Blog](https://qventis.ai/blog?hsLang=en)
- [Trust center](https://qventis.ai/platform/trust?hsLang=en)
- [Contact](https://qventis.ai/contact?hsLang=en)
- [Legal](https://qventis.ai/legal?hsLang=en)

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