# Agent 37 Cloud vs Deno Sandbox

> Deno Sandbox scores 50.3 (D) on agent readiness against Agent 37 Cloud's 46.1 (D), and leads in 4 of 7 scored categories. Agent 37 Cloud leads on maintenance & community. Both do sandbox persist. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/agent37-vs-deno-sandbox
- Markdown: https://www.anchorterminal.com/compare/agent37-vs-deno-sandbox.md (~2,600 tokens)
- Slim: https://www.anchorterminal.com/compare/agent37-vs-deno-sandbox.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/agent37-vs-deno-sandbox.json (this page as data, same URL with Accept: application/json)
- 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
- Updated: 2026-10-09

Deno Sandbox scores 50.3 (D) on agent readiness against Agent 37 Cloud's 46.1 (D), and leads in 4 of 7 scored categories. Agent 37 Cloud leads on maintenance & community. Both do sandbox persist.

- Agent 37 Cloud: grade D, 46.1/100, rank #759 of 842. Markdown https://www.anchorterminal.com/tools/agent37.md · JSON https://www.anchorterminal.com/api/v1/tools/agent37.json
- Deno Sandbox: grade D, 50.3/100, rank #689 of 842. Markdown https://www.anchorterminal.com/tools/deno-sandbox.md · JSON https://www.anchorterminal.com/api/v1/tools/deno-sandbox.json

## 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 45

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

### Deno Sandbox (D)

Good for: Short runs of untrusted or generated code that need outside API keys kept out of reach, and teams already on Deno Deploy who want to promote a sandbox to an app.

Ahead on:
- Reliability, 48 against 27
- Schema & documentation, 66 against 57
- Security & auth, 61 against 49

Watch for: Beta since 3 February 2026. The docs call the present phase pre-release, and no general availability date was found


## Score by category

| Category | Weight | Agent 37 Cloud | Deno Sandbox | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 27 | 48 | Deno Sandbox +21 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 57 | 66 | Deno Sandbox +9 |
| Agent ergonomics | 13% (16.2 this run) | 60 | 60 | even |
| Security & auth | 14% (17.5 this run) | 49 | 61 | Deno Sandbox +12 |
| Payments & pricing | 10% (12.5 this run) | 20 | 20 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 65 | 45 | Agent 37 Cloud +20 |
| Transparency & trust | 7% (8.8 this run) | 56 | 58 | Deno Sandbox +2 |
| Negative events | ≤15 | 0 | -2 | |
| **Total** | | **46.1 · D** | **50.3 · D** | |

## Facts side by side

| Fact | Agent 37 Cloud | Deno Sandbox |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Agent 37 Inc. | Deno Land Inc. |
| Hosted endpoint | `https://api.agent37.com/v1` | no (local only) |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Paid |
| 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 | Proprietary service under the Deno Deploy terms and conditions. The `@deno/sandbox` and `deno-sandbox` SDKs are MIT |
| Read-only variant documented | no | yes |
| llms.txt | yes | yes |
| Last release | 2026-10-05 | 2026-07-22 |
| Terms last updated | 2026-08-04 | 2026-09-30 |
| Privacy policy last updated | 2026-09-01 | 2026-09-30 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | not found in the text | yes |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | 74 npm/wk | 6 stars, 2k npm/wk, 32k PyPI/wk |

## 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.

**Deno Sandbox.** Secrets stay outside the microVM and are substituted only on outbound requests to approved hosts, and an allowlist limits egress. The service is still in beta, sandboxes need the $20 Pro plan, lifetime is capped at 30 minutes, and no sandbox operation appears in the published OpenAPI document.

## 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

### Deno Sandbox

1. Set `DENO_DEPLOY_TOKEN` to an organisation token (prefix `ddo_`) from Settings in console.deno.com. The organisation must be on Pro or above
2. Pass `allowNet` on every `Sandbox.create()`. The Security page says outbound access is unrestricted when it is omitted
3. Pass credentials through `secrets` with a `hosts` list, not `env`, so code in the VM sees only a placeholder
4. The default timeout ends the VM when the client disconnects. Pass a duration such as `"10m"` and reconnect with `Sandbox.connect({ id })`, up to 30 minutes
5. Create volumes in `ord` and start the sandbox in `ord`. A volume mounts only in its own region
6. `exposeHttp` URLs are public with no authentication. Treat the random subdomain as a secret

## Questions

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

Deno Sandbox scores 50.3 (D) on agent readiness against Agent 37 Cloud's 46.1 (D), and leads in 4 of 7 scored categories. Agent 37 Cloud leads on maintenance & community.

### Do Agent 37 Cloud and Deno Sandbox need an API key?

Both need an API key.

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

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


## For agents

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

## Other comparisons with Agent 37 Cloud or Deno Sandbox

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