Related Products
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About
FetchSandbox helps you test the integrations your AI wrote without touching production. From API request to production-ready integration, it lets developers build, test, and validate API integrations in realistic environments before deployment, catching failures early, reducing debugging time, and shipping with confidence. Instead of relying on static mocks, fake success responses, or risky production keys, FetchSandbox gives teams runnable API environments that behave like real services. Its stateful API sandbox keeps state across requests, enforces lifecycle transitions, fires real webhook events, and supports multi-step flows where integrations usually break. Developers can use the MCP Server, CLI, web app, OpenAPI import, and monitoring tools to prove an integration against APIs such as Stripe, Resend, Clerk, GitHub, Paddle, and Shopify.
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About
Twinbay is a hosted API simulation platform for developers testing AI agents and applications that call third-party services. Its stateful API twins can return configurable responses and model conditions such as payment declines, rate limits, expired credentials, email bounces, and paginated results. Teams direct compatible SDK requests to a twin, create isolated environments for test runs, inspect request logs, and use the environments in development or CI. The catalog includes twins for services such as GitHub, HubSpot, Plaid, Resend, Klaviyo, Linear, NetSuite, and QuickBooks. Twinbay offers a free plan with limits on twin usage and environment duration, pay-as-you-go twin-hour billing, and an Enterprise option. It is designed for engineers who need repeatable tests of agent behavior without relying on live production accounts or shared provider sandboxes.
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Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Audience
Developers and engineering teams that need to build, test, and validate API integrations in realistic sandbox environments before deployment
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Audience
Engineers at AI startups and larger companies who build agents that call third-party SaaS and fintech APIs, including CRM, accounting, payments, email, issue tracking, and developer tools.
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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API
Offers API
Supported
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API
Offers API
Not Supported
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Screenshots and Videos |
Screenshots and VideosNo images available
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Pricing
$5 per month
Free Version
Supported
Free Trial
Not Supported
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Pricing
$1/twin-hour
A free plan includes up to 5 twins and 1-hour environments. Pay-as-you-go is $1 per twin-hour, billed by the second. Enterprise pricing is custom and annual. Eligible startups may receive $5,000 in credits over 24 months.
Free Version
Supported
Free Trial
Not Supported
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Reviews/
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Reviews/
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Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Company InformationFetchSandbox
Founded: 2026
United States
fetchsandbox.com
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Company InformationTwinbay
Founded: 2024
United States
twinbay.ai
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Alternatives |
Alternatives |
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Categories |
Categories |
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Integrations
GitHub
Supported
Resend
Supported
Shopify
Supported
Stripe
Supported
AgentMail
Supported
BILL
Not Supported
Cursor
Supported
HubSpot CRM
Not Supported
Klaviyo
Not Supported
Kulipa
Supported
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Integrations
GitHub
Supported
Resend
Supported
Shopify
Supported
Stripe
Supported
AgentMail
Not Supported
BILL
Supported
Cursor
Not Supported
HubSpot CRM
Supported
Klaviyo
Supported
Kulipa
Not Supported
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