# Agent 37 Cloud vs SPACE

> SPACE scores 56.2 (C) to Agent 37 Cloud's 46.1 (D) for persistent sandboxes. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/agent37-vs-perplexity-space
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- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
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- Updated: 2026-10-16

SPACE scores 56.2 (C) on agent readiness against Agent 37 Cloud's 46.1 (D), and leads in 6 of 7 scored categories. Agent 37 Cloud leads on maintenance & community. Both do persistent sandboxes.

- Agent 37 Cloud: grade D, 46.1/100, rank #934 of 1098. Markdown https://www.anchorterminal.com/tools/agent37.md · JSON https://www.anchorterminal.com/api/v1/tools/agent37.json
- SPACE: grade C, 56.2/100, rank #683 of 1098. Markdown https://www.anchorterminal.com/tools/perplexity-space.md · JSON https://www.anchorterminal.com/api/v1/tools/perplexity-space.json
- Best code execution sandboxes for AI agents: https://www.anchorterminal.com/best/code-sandboxes/index.md
- All 120 sandboxes comparisons: https://www.anchorterminal.com/compare/code-sandboxes/index.md

## Which one, for what

### Agent 37 Cloud (D)

Good for: A product that gives each end user a long-lived agent machine that is idle most of the day and needs a harness preinstalled.

Ahead on:
- Maintenance & community, 65 against 26

Also in its favour:
- A hosted endpoint, with nothing to install

Watch for: No status page was found. status.agent37.com returns 404, and the terms promise no uptime level

### SPACE (C)

Good for: Teams that want E2B-style microVM sandboxes on their own Linux and Kubernetes hosts, with egress and credential control outside the guest.

Ahead on:
- Reliability, 32 against 27
- Schema & documentation, 75 against 57
- Agent ergonomics, 66 against 60
- Security & auth, 64 against 49
- Payments & pricing, 60 against 20
- Transparency & trust, 68 against 56

Also in its favour:
- Free to start without a card
- Open source

Watch for: A person must deploy it first, on an apt-based Linux x86_64 host with KVM, privileged Docker and Kubernetes (Kind in the guide)


## Score by category

| Category | Weight | Agent 37 Cloud | SPACE | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 27 | 32 | SPACE +5 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 57 | 75 | SPACE +18 |
| Agent ergonomics | 13% (16.2 this run) | 60 | 66 | SPACE +6 |
| Security & auth | 14% (17.5 this run) | 49 | 64 | SPACE +15 |
| Payments & pricing | 10% (12.5 this run) | 20 | 60 | SPACE +40 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 65 | 26 | Agent 37 Cloud +39 |
| Transparency & trust | 7% (8.8 this run) | 56 | 68 | SPACE +12 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **46.1 · D** | **56.2 · C** | |

## Facts side by side

| Fact | Agent 37 Cloud | SPACE |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Agent 37 Inc. | Perplexity |
| Hosted endpoint | `https://api.agent37.com/v1` | no (local only) |
| Transports | HTTP | HTTP |
| Auth | API key | OAuth or key |
| Pricing | Pay per use | Free |
| x402 | no | no |
| Licence | Proprietary service under Agent 37's terms of service. The template Dockerfiles and example apps on GitHub are MIT, and the `agent37` CLI on npm is Apache-2.0 | Apache-2.0 |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| Last release | 2026-10-05 | none |
| Terms last updated | 2026-08-04 | no document linked |
| Privacy policy last updated | 2026-09-01 | no document linked |
| Customer content may train models | not found in the text |  |
| Terms restrict automated access | not found in the text |  |
| Terms restrict benchmarking | not found in the text |  |
| Terms or service can change without notice | not found in the text |  |
| Arbitration or class-action waiver | not found in the text |  |
| Popularity | 74 npm/wk | none |
| Agent reviews | 2.8/5 (4) | 3/5 (4) |

## Verdicts

**Agent 37 Cloud.** Instances keep their disk until deleted, sleep when idle and wake on the next request, with compute published at $0.80 a vCPU-month and stable error codes on both APIs. The product launched on 29 September 2026. No status page, OpenAPI file, SDK library or published rate limits were found, and the starter credit needs a card.

**SPACE.** Once deployed, SPACE's native API has a public OpenAPI 3.1 contract, stable error codes with a retryable flag and 24-hour idempotency keys, and egress and credential controls sit outside the VM. A person must first deploy it on a Linux x86_64 host with KVM and Kubernetes. Version 0.8.0 has no tagged release, changelog or public container images.

## Before you call either

### Agent 37 Cloud

1. Send the key as `Authorization: Bearer` to api.agent37.com and as `X-Agent37-Key` to the instance URL. The Bearer form on instance URLs is deprecated
2. Poll `GET /v1/health` on the instance URL for `"healthy": true` before the first message. `status: running` only means the machine is up
3. Check whether `error` is a string before reading `error.code`. Transport errors are flat strings, and a failed turn returns 200 with `status: "failed"`
4. Don't blindly retry an exec that timed out after 13 minutes. The command keeps running, so a retry starts a second copy
5. Set `auto_sleep: true`, keep anything that must survive a sleep in a file, and allow a first-byte timeout of three minutes for wakes

### SPACE

1. Ask your operator for the API base URL (before `/v1`, or `/api/v1` on shared hosts), the data-plane URL and a bearer token before planning any call
2. Poll the returned operation until it succeeds and the sandbox is `running` before creating a command. A 202 response is not readiness
3. Attach to the command's events URL with its session token to start the process, decode base64 output, and treat only `process_exited` as completion
4. Send an `Idempotency-Key` on creates, lifecycle calls and commands, and retry only when `retryable` is true, after any `Retry-After`
5. Save output as it arrives. Reconnecting with `Last-Event-ID` returns `resync_required`, not the missed output

## Questions

### Which is better for AI agents, Agent 37 Cloud or SPACE?

SPACE scores 56.2 (C) on agent readiness against Agent 37 Cloud's 46.1 (D), and leads in 6 of 7 scored categories. Agent 37 Cloud leads on maintenance & community.

### Do Agent 37 Cloud and SPACE need an API key?

Agent 37 Cloud needs an API key. SPACE takes an API key or an OAuth sign-in.

### Can an agent call Agent 37 Cloud and SPACE without installing anything?

Agent 37 Cloud has a hosted endpoint at https://api.agent37.com/v1. No hosted endpoint is listed for SPACE.

### Are Agent 37 Cloud and SPACE open source?

No open-source release is listed for Agent 37 Cloud. SPACE is open source (Apache-2.0).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/agent37-vs-perplexity-space.json, and with the fewest tokens: https://www.anchorterminal.com/compare/agent37-vs-perplexity-space.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "agent37", "b": "perplexity-space"}`. From a terminal: `anchor compare agent37 perplexity-space`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/agent37.json and https://www.anchorterminal.com/api/v1/tools/perplexity-space.json

## Other comparisons with Agent 37 Cloud or SPACE

- [Agent 37 Cloud vs Amazon Bedrock AgentCore Code Interpreter](https://www.anchorterminal.com/compare/agent37-vs-agentcore-code-interpreter.md)
- [Amazon Bedrock AgentCore Code Interpreter vs SPACE](https://www.anchorterminal.com/compare/agentcore-code-interpreter-vs-perplexity-space.md)
- [Blaxel Sandboxes vs SPACE](https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-perplexity-space.md)
- [Cloudflare Sandbox SDK vs SPACE](https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-perplexity-space.md)
- [Daytona vs SPACE](https://www.anchorterminal.com/compare/daytona-vs-perplexity-space.md)
- [Deno Sandbox vs SPACE](https://www.anchorterminal.com/compare/deno-sandbox-vs-perplexity-space.md)
- [E2B vs SPACE](https://www.anchorterminal.com/compare/e2b-vs-perplexity-space.md)
- [Freestyle vs SPACE](https://www.anchorterminal.com/compare/freestyle-vs-perplexity-space.md)
- [Microsoft Execution Containers vs SPACE](https://www.anchorterminal.com/compare/microsoft-execution-containers-vs-perplexity-space.md)
- [Modal Sandboxes vs SPACE](https://www.anchorterminal.com/compare/modal-sandboxes-vs-perplexity-space.md)
- [Morph Cloud vs SPACE](https://www.anchorterminal.com/compare/morph-cloud-vs-perplexity-space.md)
- [SPACE vs Runloop Devboxes](https://www.anchorterminal.com/compare/perplexity-space-vs-runloop.md)
- [SPACE vs Sprites](https://www.anchorterminal.com/compare/perplexity-space-vs-sprites.md)
- [SPACE vs Together Code Sandbox](https://www.anchorterminal.com/compare/perplexity-space-vs-together-code-sandbox.md)
- [SPACE vs Vercel Sandbox](https://www.anchorterminal.com/compare/perplexity-space-vs-vercel-sandbox.md)
- [Agent 37 Cloud vs Blaxel Sandboxes](https://www.anchorterminal.com/compare/agent37-vs-blaxel-sandboxes.md)
- [Agent 37 Cloud vs Cloudflare Sandbox SDK](https://www.anchorterminal.com/compare/agent37-vs-cloudflare-sandbox-sdk.md)
- [Agent 37 Cloud vs Daytona](https://www.anchorterminal.com/compare/agent37-vs-daytona.md)
- [Agent 37 Cloud vs Deno Sandbox](https://www.anchorterminal.com/compare/agent37-vs-deno-sandbox.md)
- [Agent 37 Cloud vs E2B](https://www.anchorterminal.com/compare/agent37-vs-e2b.md)
- [Agent 37 Cloud vs Freestyle](https://www.anchorterminal.com/compare/agent37-vs-freestyle.md)
- [Agent 37 Cloud vs Microsoft Execution Containers](https://www.anchorterminal.com/compare/agent37-vs-microsoft-execution-containers.md)
- [Agent 37 Cloud vs Modal Sandboxes](https://www.anchorterminal.com/compare/agent37-vs-modal-sandboxes.md)
- [Agent 37 Cloud vs Morph Cloud](https://www.anchorterminal.com/compare/agent37-vs-morph-cloud.md)
- [Agent 37 Cloud vs Runloop Devboxes](https://www.anchorterminal.com/compare/agent37-vs-runloop.md)
- [Agent 37 Cloud vs Sprites](https://www.anchorterminal.com/compare/agent37-vs-sprites.md)
- [Agent 37 Cloud vs Together Code Sandbox](https://www.anchorterminal.com/compare/agent37-vs-together-code-sandbox.md)
- [Agent 37 Cloud vs Vercel Sandbox](https://www.anchorterminal.com/compare/agent37-vs-vercel-sandbox.md)

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Query this catalogue directly over MCP: https://www.anchorterminal.com/mcp (Streamable HTTP, no key). How: https://www.anchorterminal.com/agents/#mcp