Agent Substrate FetchSandbox

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Agent Substrate:

About

Agent Substrate is an open-source runtime for operating isolated, stateful agent and code-execution sandboxes on Kubernetes. It coordinates actor and worker lifecycles, places active workloads on a shared pool of ready capacity, and can suspend idle environments while preserving memory and filesystem state for later resumption. Sandboxes use gVisor or Cloud Hypervisor microVM isolation, with per-actor identity and network controls. Agent Substrate is designed for platform and infrastructure teams building agent-hosting services, coding environments, and other workloads that execute untrusted or intermittent tasks. The core project is Kubernetes-portable; Google Cloud also provides GKE-optimized deployment tooling. Optional Filestore agent volumes can persist workspaces across suspend and resume cycles.
FetchSandbox:

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.
Agent Substrate:

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Supported
Cloud Not Supported
On-Premises Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported
FetchSandbox:

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
Agent Substrate:

Audience

Platform and infrastructure teams building services that run isolated agent or code-execution workloads on Kubernetes.
FetchSandbox:

Audience

Developers and engineering teams that need to build, test, and validate API integrations in realistic sandbox environments before deployment
Agent Substrate:

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported
FetchSandbox:

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported
Agent Substrate:

API

Offers API Supported
FetchSandbox:

API

Offers API Supported
Agent Substrate:

Screenshots and Videos

FetchSandbox:

Screenshots and Videos

Agent Substrate:

Pricing

$0
Agent Substrate on GKE is offered at no extra charge. GKE pricing applies to the resources you create.
Free Version Supported
Free Trial Not Supported
FetchSandbox:

Pricing

$5 per month
Free Version Supported
Free Trial Not Supported
Agent Substrate:

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software
FetchSandbox:

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software
Agent Substrate:

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported
FetchSandbox:

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported
Agent Substrate:

Company Information

Google
Founded: 1998
United States
github.com/agent-substrate/substrate
FetchSandbox:

Company Information

FetchSandbox
Founded: 2026
United States
fetchsandbox.com
Agent Substrate:

Alternatives

FetchSandbox:

Alternatives

Agent Substrate:
FetchSandbox:
Agent Substrate:
FetchSandbox:
Agent Substrate:
FetchSandbox:
Agent Substrate:
Sprites

Sprites

Fly.io
FetchSandbox:
Apidog

Apidog

4.0 out of 5 stars
Agent Substrate:

Categories

FetchSandbox:

Categories

API Design Supported
Agent Substrate:

Integrations

Model Context Protocol (MCP) Supported
AgentMail Not Supported
Claude Code Not Supported
Clerk Not Supported
Cursor Not Supported
GitHub Not Supported
Google Cloud Filestore Supported
Google Cloud Platform Supported
Kulipa Not Supported
Paddle Not Supported
Resend Not Supported
Sendmux Not Supported
Shopify Not Supported
Stripe Not Supported
Twilio Not Supported
Visual Studio Code Not Supported
Windsurf Browser Not Supported
FetchSandbox:

Integrations

Model Context Protocol (MCP) Supported
AgentMail Supported
Claude Code Supported
Clerk Supported
Cursor Supported
GitHub Supported
Google Cloud Filestore Not Supported
Google Cloud Platform Not Supported
Kulipa Supported
Paddle Supported
Resend Supported
Sendmux Supported
Shopify Supported
Stripe Supported
Twilio Supported
Visual Studio Code Supported
Windsurf Browser Supported
Agent Substrate:
Claim Agent Substrate and update features and information
Claim Agent Substrate and update features and information
FetchSandbox:
Claim FetchSandbox and update features and information
Claim FetchSandbox and update features and information