Mock APIs.
No setup.
Free, hosted mocks of the third-party APIs you build against: Stripe, HSBC, Vipps, and more. No signup. No setup. No SDK. Just a URL that returns the response shape, generated straight from the provider's OpenAPI spec.
Featured mocks
Stripe API
Mock the Stripe API for payments, subscriptions, and invoicing without test keys, webhooks, or rate limits.
№ 002HSBC Account Information API
Mock HSBC's UK Open Banking AIS: account access consents, balances, transactions, direct debits, and scheduled payments.
№ 003Vipps Recurring Payments
Mock the Vipps Recurring Payments API: draft agreements, activate subscriptions, charge customers, and replay the webhooks.
Powered by mockzilla
Mock APIs, generated from OpenAPI specs.
mockzilla is an open-source mock server. Point it at an OpenAPI spec and it serves realistic responses for every endpoint: correct schemas, correct status codes, correct content types. It runs anywhere a binary or Docker container runs.
mockzilla.org is the hosted version. Push your OpenAPI spec to GitHub, get a private simulation URL in seconds. PR environments, multi-region deploy, rate-limit headers, optional API keys. The free tier covers one repo, ten thousand requests a month, no credit card.
justmocks is this public catalog: pre-built mocks of third-party services (Stripe, HSBC, Vipps, and growing), running on the same mockzilla engine. Free for anyone to curl, no signup required.
How it works
Provider publishes an OpenAPI spec.
We grab it untouched. No hand-written stubs, no AI-generated fixtures.
mockzilla generates the simulation.
Every endpoint, status code, schema. Responses match the contract field-for-field.
Listed on justmocks.
Each mock gets its own page with the full endpoint list, the live URL, and a link to the source OpenAPI spec.
You hit the URL.
No signup. No key. Just a hostname that returns the shape.
Questions
FAQ.
Still confused? Email info@justmocks.com.
01Are these real APIs? +
api.justmocks.com/<slug>/… and returns synthetic responses generated from the provider's OpenAPI spec. They look real, but they don't move money, talk to your bank, or trigger webhooks at the real provider.