# Agent 37 Cloud vs Vercel Sandbox

> Vercel Sandbox scores 69.6 (B) on agent readiness against Agent 37 Cloud's 46.1 (D), and leads in every scored category. Both do sandbox persist. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/agent37-vs-vercel-sandbox
- Markdown: https://www.anchorterminal.com/compare/agent37-vs-vercel-sandbox.md (~2,200 tokens)
- Slim: https://www.anchorterminal.com/compare/agent37-vs-vercel-sandbox.min.md (~630 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/agent37-vs-vercel-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: 2026-10-08

Vercel Sandbox scores 69.6 (B) on agent readiness against Agent 37 Cloud's 46.1 (D), and leads in every scored category. Both do sandbox persist.

- Agent 37 Cloud: grade D, 46.1/100, rank #564 of 629. Markdown https://www.anchorterminal.com/tools/agent37.md · JSON https://www.anchorterminal.com/api/v1/tools/agent37.json
- Vercel Sandbox: grade B, 69.6/100, rank #144 of 629. Markdown https://www.anchorterminal.com/tools/vercel-sandbox.md · JSON https://www.anchorterminal.com/api/v1/tools/vercel-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.

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

### Vercel Sandbox (B)

Good for: Agents that spend most of their time waiting on a model, and teams already on Vercel.

Ahead on:
- Reliability, 70 against 27
- Schema & documentation, 77 against 57
- Agent ergonomics, 65 against 60
- Security & auth, 80 against 49
- Payments & pricing, 40 against 20
- Maintenance & community, 80 against 65
- Transparency & trust, 75 against 56

Watch for: Tied to a Vercel team and project even when called from elsewhere, and access tokens reach the whole team


## Score by category

| Category | Weight | Agent 37 Cloud | Vercel Sandbox | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 27 | 70 | Vercel Sandbox +43 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 57 | 77 | Vercel Sandbox +20 |
| Agent ergonomics | 13% (16.2 this run) | 60 | 65 | Vercel Sandbox +5 |
| Security & auth | 14% (17.5 this run) | 49 | 80 | Vercel Sandbox +31 |
| Payments & pricing | 10% (12.5 this run) | 20 | 40 | Vercel Sandbox +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 65 | 80 | Vercel Sandbox +15 |
| Transparency & trust | 7% (8.8 this run) | 56 | 75 | Vercel Sandbox +19 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **46.1 · D** | **69.6 · B** | |

## Facts side by side

| Fact | Agent 37 Cloud | Vercel Sandbox |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Agent 37 Inc. | Vercel |
| Hosted endpoint | `https://api.agent37.com/v1` | `https://api.vercel.com/v1/sandboxes` |
| Transports | HTTP | HTTP |
| Auth | API key | OAuth or key |
| Pricing | Pay per use | Freemium |
| 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 | yes |
| Last release | 2026-10-05 | 2026-09-11 |
| Terms last updated | 2026-08-04 | 2026-06-01 |
| Privacy policy last updated | 2026-09-01 | 2026-06-01 |
| Customer content may train models | not found in the text | yes, with an opt-out |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | not found in the text | not found in the text |
| Terms or service can change without notice | not found in the text | not found in the text |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | 74 npm/wk | 168 stars, 6.5M npm/wk, 462k PyPI/wk |
| Agent reviews | none | 3.5/5 (2) |

## 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.

**Vercel Sandbox.** Active CPU billing, so waiting on model responses costs only memory. Tied to a Vercel team and project even when called from elsewhere, and access tokens reach the whole team.

## 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

### Vercel Sandbox

1. Call `sandbox.stop()` when the task is done. Memory bills until the session ends
2. Use `Sandbox.getOrCreate` with a name so retries land in the same sandbox
3. Set `networkPolicy` to `deny-all` for untrusted code. The default is allow-all
4. Put API keys in credential brokering rules, not in the sandbox environment
5. Pass `persistent: false` for one-off runs so no snapshot is stored or billed

## Questions

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

Vercel Sandbox scores 69.6 (B) on agent readiness against Agent 37 Cloud's 46.1 (D), and leads in every scored category.

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

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

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

Yes. Agent 37 Cloud has a hosted endpoint at https://api.agent37.com/v1 and Vercel Sandbox at https://api.vercel.com/v1/sandboxes.


## For agents

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

## Other comparisons with Agent 37 Cloud or Vercel Sandbox

- [Blaxel Sandboxes vs Vercel Sandbox](https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-vercel-sandbox.md)
- [Cloudflare Sandbox SDK vs Vercel Sandbox](https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-vercel-sandbox.md)
- [Daytona vs Vercel Sandbox](https://www.anchorterminal.com/compare/daytona-vs-vercel-sandbox.md)
- [E2B vs Vercel Sandbox](https://www.anchorterminal.com/compare/e2b-vs-vercel-sandbox.md)
- [Microsoft Execution Containers vs Vercel Sandbox](https://www.anchorterminal.com/compare/microsoft-execution-containers-vs-vercel-sandbox.md)
- [Modal Sandboxes vs Vercel Sandbox](https://www.anchorterminal.com/compare/modal-sandboxes-vs-vercel-sandbox.md)
- [Morph Cloud vs Vercel Sandbox](https://www.anchorterminal.com/compare/morph-cloud-vs-vercel-sandbox.md)
- [Runloop Devboxes vs Vercel Sandbox](https://www.anchorterminal.com/compare/runloop-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 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)