Rivet
By Rivet (YC, a16z Speedrun)
Actor-based infrastructure for stateful AI agent workloads, providing durable Actors, agent orchestration, and replayable Workflows that run inside your own backend instead of a custom runtime; open-source library plus a paid cloud and self-hosted enterprise option, roughly 6,000 GitHub stars on its core Actors library.
Best for
- durable stateful agent processes
- running agents inside your own backend
- replayable multi-step agent workflows
- self-hosted or air-gapped agent infra
- Aug 12, 2026Added to the catalogue: YC/a16z-backed actor infrastructure for durable, stateful agent workloads that run inside your own backend.
Other Sandboxes & code execution
E2B
Sandboxed cloud VMs purpose-built for AI agents — spin up a Linux environment in milliseconds, run untrusted code, throw it away.
Vercel Sandbox
Firecracker-based microVMs from Vercel for running untrusted code at the edge. Strong fit if you're already deploying on Vercel.
Modal
Serverless compute platform built for AI workloads — GPU jobs, ephemeral functions, and code sandboxes triggered from agents or webhooks.
Daytona
Cloud dev environments designed for AI agents. Each agent gets its own isolated, reproducible workspace it can install tools into.
Runloop
Secure code-execution sandboxes for AI agents with evaluation tooling and snapshot/checkpoint support, built for enterprise scale.
Blaxel
Infrastructure platform for autonomous agents using microVMs that boot in milliseconds and resume in ~25ms with $0 idle cost.
Northflank
Deployment platform offering secure sandboxes and microVMs (200ms spin-up) for running untrusted and AI-generated code at scale.
Beam
On-demand AI compute platform for running agent sandboxes, task queues and GPU workloads, with bring-your-own-cloud support.