❯ api simulation platform

Don’t just mock APIs. Simulate environments

Accelerate testing and AI-native development with isolated pre-production environments that mimic reality. Decouple your code from the APIs it depends on, shift-left testing, and move faster — regardless of who’s writing the code.

An industry standard, now AI-native.

WireMock is trusted by the world’s largest companies to deliver enterprise-grade mocking and service virtualization. Now, it’s powering the transformation from traditional coding to the AI SDLC.

We’re no longer dependent on other teams or 3rd party vendor APIs, and this saves us a lot of time and costs.

Divyeshkumar PatelCloud Engineering, Ally Financial

WireMock is awesome because we can shorten our feature release lifecycle by three weeks.

Andy HeywoodEngineering Manager, OVO Energy

WireMock Cloud has become the backbone of our daily regression and sanity testing.

Fady MikhaelQA Lead, Cuscal

Built for accelerating delivery — by people and by agents

Advanced capabilities, light years beyond basic mocking

From a single prompt, create stateful mocks to test complex application flows, validation that keeps your mock responses up-to-date, and responses driven by external data sources. WireMock Cloud gives you full, dynamic simulation capabilities — and AI flattens the learning curve.

WireMock Cloud stub editor for a PayPal Invoicing API simulation, with dynamic state operations, Git syncing, and chaos enabled

Use AI to simulate any API you depend on, anywhere

REST, GraphQL, gRPC — if it’s in your environment, WireMock Cloud can simulate it. Use the AI, UI, or CLI to build a simulation from scratch, or point WireMock Runner at a live API to record one — even services locked behind your corporate firewall, where no traffic ever leaves your network.

An AI agent building a full WhatsApp for Business API simulation in WireMock Cloud from a single slash command

Run performance and validation tests that mimic reality

Deliver resilient code, even when it’s written by AI. WireMock Cloud puts shift-left testing in the hands of every developer and tester — no shared staging, no waiting on another team. Get off the happy path and inject failure modes, rate limits, and latency, or turn on chaos engineering.

WireMock Cloud failure scenarios and chaos testing settings — random API delay, failure types, and percentage of failures

Self-serve for agents. Governed for the enterprise.

Let agents write the tests, but stay in control. Every simulation is versioned with Git integration, every request is logged, and access is controlled with RBAC and SSO — so a hundred agents can create and modify mocks all day while your platform team keeps a full audit trail. SOC 2 certified, ready for your security review.

GitHub Actions workflow runs playing back staged WireMock simulations in CI

Want more features? We’ve got ’em

Multi-protocol: REST, GraphQL & gRPC

Simulate whatever your stack speaks. Full matching and templating support across REST, GraphQL, and gRPC, so one platform covers your public APIs and your internal service mesh.

Traffic recording & snapshots

Point WireMock Cloud at a real API and record its behavior into editable stubs. Use the CLI to capture services running locally or inside your corporate network — no traffic ever has to leave it.

OpenAPI-native workflows

Import a spec to generate a working simulation, validate every stub against the schema, and catch drift when the spec changes. Your mocks stay honest instead of quietly rotting.

Dynamic response templating

Handlebars templates build responses from the request: echo IDs, compute dates, vary payloads. The difference between a demo mock and one your whole test suite can lean on.

Data-driven simulation

Back your mocks with CSV files or database data sources, so a thousand test users return a thousand different profiles. Agents generating test cases get realistic variety for free.

Webhooks & async callbacks

Simulate the other half of modern APIs: payment confirmations, delivery notifications, long-running job callbacks. Fire webhooks on a delay or in response to a request, just like production.

Proxying & selective pass-through

Mock the endpoints you need and proxy the rest to the real API. Hybrid mode lets you simulate the one flaky dependency without faking an entire vendor.

Live request logs & debugging

Every request in, every response out, with a diagnosis for anything that didn't match a stub. When an agent-written test fails at 3am, the log shows exactly what it sent.

Versioning & Git integration

Every change to a simulation is versioned, diffable, and syncable to Git. Roll back a bad edit — yours or your agent's — in one click.

Enterprise security

SOC 2 certified, with role-based access control and OpenID Connect SSO. The mock layer clears your security review as fast as the code it tests.

Embedded developer portals

Auto-generate API docs and embed live sandboxes in your developer portal, so internal and partner developers can try your APIs against a simulation before they ever get credentials.

Import & migration

Bring existing mocks in from Postman, HAR files, OpenAPI/Swagger, or WireMock open source. Nothing you've already built is wasted work.

Retire your mocks. Ship simulations.

Get the guided tour of WireMock Cloud, or start free and build your first stateful simulation today.