Who it is for
Backend and integration teams that need a stand-in API before the real service exists.
Overview
What StubEngine does
StubEngine converts written requirements into running mock endpoints. A request describes the route, the status code, and the response body in ordinary language, and the app creates a mock that can be called right away.
Scope ranges from one endpoint to a set of related endpoints held together as a project. Mocks live in a shared workspace, so a team works against the same definitions instead of local stubs that drift apart.
Two skills are listed, one for creating mocks and one for managing them. The sample requests include a GET route returning a healthy status payload and a POST payments route that answers with a 402 error, which suggests error paths are part of the intended use.
What stands out
Mock definitions sit in a shared team workspace rather than on individual machines.
Availability
Where StubEngine is listed
StubEngine is listed in the ChatGPT apps directory only. StubEngine has no connector under the same domain in the Claude directory; 392 of the 3,150 products here are on both marketplaces, and this is not one of them.
ChatGPT apps are built on MCP, and the same server can back a Claude connector, so the absence is a distribution decision rather than a technical one.
ChatGPT listing
In the ChatGPT apps directory
- Developer
- StubEngine
- Filed under
- Developer Tools
- Listed since
- July 2026
- Authentication
- Authenticates when installed
- Website
- stubengine.com
- Policies published
- Privacy policy · Terms of service
- Official listing
- Open in ChatGPT
- Snapshot
- August 2026
Named skills
StubEngine declares 2 named skills, which puts it in the 6.7% of ChatGPT-listed apps that do.
- create-api-mock
- manage-api-mocks
Example prompts from the listing
- Create a GET endpoint /api/v1/status. It should return a 200 OK status and a JSON body containing {"status": "healthy"}
- Create a POST mock payments charge that returns a 402 error.
Nearby
Other Developer Tools connectors
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Product specs, PRDs, and tasks pulled into a coding session
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Error Log Parser
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Ezoic Setup
Implementation help for Ezoic ad integration on websites
Claude · ChatGPT
Git Diff Patcher Bridge
Repository inspection with patches queued for local review
ChatGPT
This is an independent catalogue entry compiled by Node8 from StubEngine's public marketplace listing as it stood in August 2026. Listing facts come from the marketplaces; the comparisons against the rest of the directory and any live-endpoint measurements are Node8's. Node8 is not affiliated with StubEngine, and inclusion here is not an endorsement.
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