| What it does | Cloud agent sandbox with persistent filesystem and on-demand compute
| An engine for long-running agents that rebuilds its prompt under a cap and runs on your budget
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| Stage | MVP
| MVP
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| Founded | Not given
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| Based in | US
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| Pricing model | Paid
| Freemium
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| Pricing | Compute: $0.015 per GiB-hour (approximately $0.000004167 per GiB-second, billed by the second). Storage: $0.02 per GiB-month for retained incremental RootFS data and memory checkpoints. Network ingress and egress currently free. Object-store GET and PUT requests free. New users receive $5 free credi
| Prototype: free during beta, then from December 16, 2026 it costs $1 per 1,000 agent calls after 1,000 monthly included calls. Production: $20 a month with 20,000 agent calls included, then $1 per 1,000 calls after that. Top-ups: $1 per 1,000 calls, from $10 to $500 at a time, never expiring.
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| Key features | - Automatic filesystem growth as storage fills
- Pause compute without losing work or paying compute charges
- Resume to same environment on demand
- Access files while paused without waking compute
- Public HTTP services with auto-resume capability
- Command-line interface (s0 CLI) for agent-native workflows
- Incremental checkpoints to avoid full filesystem copies
- Scoped API keys and team-based access controls
- On-demand file reads without downloading entire filesystem
| - Prompt rebuilt from journal under token cap at each step to keep it bounded as history grows
- Spending limits checked before each model call at token prices you declare
- Resume after crash without repeating finished actions
- Tool calls returned as actions for your code to carry out
- Proof of what ran: check prompts, re-run engine, download hash-chained journal
- Integrations with Vercel AI SDK, OpenAI Agents SDK, LangGraph, Mastra, Pydantic AI
- MCP server for Claude Code, Claude Projects and Codex
- Works with any model via bring-your-own-key
- TypeScript and Python clients for HTTP API access
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| What makes it different | - Persistent filesystem across pause/resume without duplicating data
- Pay only for compute time used; paused sandboxes have zero compute charges
- Automatic filesystem growth so agents can install and persist unlimited tools
- Same API for both human users and AI agents
| - Bounded prompt under a fixed cap while history grows, so costs per call stop climbing on long sessions
- Every run recorded with cryptographic proof: rebuilable prompts, hash-chained journal, re-runnable engine
- Resumes from crash without repeating finished actions using stable idempotency keys
- Budget enforcement before each model call, not reactive overage billing
- No model key storage or logging; your provider bills you directly
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| Free plan | Not given
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| Open source | Not given
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| Platforms | Not given
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| Public API | Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 16 ▲ +1 (up) since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 5 | 0 |
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| Citation Flow (Majestic) | 21 | 9 |
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| Referring domains (Majestic) | 17 | 4 |
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Argentic