StubEngine

StubEngine helps companies speed up API delivery by turning plain-English requirements into live API mocks. Users can generate valid mock APIs and manage everything in a shared business workspace. Whether you need a single mocked endpoint or a full API project with related endpoints, StubEngine makes it faster to prototype, test and ship integrations. By reducing manual setup and accelerating mock creation, teams can move from idea to working API simulation in minutes.

View in the ChatGPT registry

Integration type: Plugin
Verification status: Not applicable
Platform: ChatGPT
Category: Developer Tools
Primary Subcategory: API Development & Testing Platforms
Secondary Subcategories: None listed
Brand: StubEngine
Access: Account required
First tracked: 2026-07-29
Tool count: 4
Geography: US

ChatGPT Plugin Discoverability Score

ChatGPT organic discovery is not live yet

StubEngine is tracked in the ChatGPT Plugin registry. Public organic-discovery measurement is not live for ChatGPT yet, so there is no score to publish today.

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Primary Subcategory

Competing in ChatGPT API Development & Testing Platforms

View Category

Listed in alphabetical order

Primary Subcategory

3Min APIOrganic discovery is pendingGet the score at launch

AI App Readiness CheckerOrganic discovery is pendingGet the score at launch

StubEngineOrganic discovery is pendingGet the score at launch

Score explained

How the Discoverability Score works

Organic discovery scoring for StubEngine on ChatGPT is not live yet. The score will use measured agent conversations when it launches.

InvisibleBuriedEmergingCompetitiveWinning

Organic discovery scoring is pending. Your Plugin score will appear on this scale when measurement goes live.

FoundDiagnostic

Whether Claude found your Plugin in connector search. It must be Found before it can reach the picker, but the score counts picker appearances—not search results.

PickedMain score

How often your Plugin appeared in the picker, or Claude invoked it directly, across contested conversations. This percentage is the Discoverability Score; the headline number is rounded.

PositionedDiagnostic

What position your Plugin appeared in when it was shown in the picker. This shows prominence, but it does not affect the score.

Read the full scoring methodology Recommended guideHow to get your Claude Connector organically discoveredFollow the practical steps agents use to find, shortlist, and choose your Connector.

Tools

4 tools agents can invoke

Creates a new mock or middleware endpoint. Pass id, slug, or name from list_organizations. For paths with parameters, prefer 'urlPathTemplate' (e.g. /users/{id}) over regex patterns. For proxies, include response.proxyBaseUrl.
create_endpoint
Deletes a mock or middleware endpoint. Pass endpoint id, or path plus organization id/slug/name from list_organizations.
delete_endpoint
Lists existing mock and middleware endpoints in an organization. Pass id, slug, or name from list_organizations.
list_endpoints
Lists organizations where you are a member. Use returned id, name, and slug for other tools.
list_organizations

StubEngine FAQ

How do I improve a ChatGPT Plugin's discoverability?

The levers are the listing surface agents actually read: names, descriptions, keywords, tool metadata, and registry health. Which lever matters depends on where discovery breaks, which is what continuous measurement shows.

What are StubEngine alternatives on ChatGPT?

As of 2026-08-14, StubEngine competes with 3Min API, AI App Readiness Checker in ChatGPT API Development & Testing Platforms, ranked by public Discoverability Score.

Where is this profile measured?

This profile uses the geography attached to the latest public registry snapshot: US. Locale tags are intentionally omitted.