# Massed Compute vs Vast.ai

> Vast.ai scores 62.6 (B) to Massed Compute's 42.3 (E) for gpu compute. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/massed-compute-vs-vast-ai
- Markdown: https://www.anchorterminal.com/compare/massed-compute-vs-vast-ai.md (~2,750 tokens)
- Slim: https://www.anchorterminal.com/compare/massed-compute-vs-vast-ai.min.md (~780 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/massed-compute-vs-vast-ai.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

Vast.ai scores 62.6 (B) on agent readiness against Massed Compute's 42.3 (E), and leads in 6 of 7 scored categories. Both do gpu compute.

- Massed Compute: grade E, 42.3/100, rank #896 of 950. Markdown https://www.anchorterminal.com/tools/massed-compute.md · JSON https://www.anchorterminal.com/api/v1/tools/massed-compute.json
- Vast.ai: grade B, 62.6/100, rank #425 of 950. Markdown https://www.anchorterminal.com/tools/vast-ai.md · JSON https://www.anchorterminal.com/api/v1/tools/vast-ai.json
- Best GPU and serverless compute for AI workloads: https://www.anchorterminal.com/best/gpu-compute/index.md
- All 167 gpu compute comparisons: https://www.anchorterminal.com/compare/gpu-compute/index.md

## Which one, for what

### Massed Compute (E)

Good for: Agents that rent whole GPU VMs by the hour for training, fine-tuning or a model server and want a small MCP tool set with a read-only mode.

Watch for: No status page, incident history or security.txt was found on any of the vendor's hosts

### Vast.ai (B)

Good for: Cost-sensitive training, batch work and self-managed inference where the agent can search listings, set a price cap and tolerate host variance or interruption.

Ahead on:
- Reliability, 65 against 20
- Schema & documentation, 78 against 69
- Security & auth, 72 against 61
- Maintenance & community, 81 against 51

Also in its favour:
- No incidents deducted, where Massed Compute loses 5 points for them

Watch for: No SLA. The terms say availability is not guaranteed and the service can change without notice


## Score by category

| Category | Weight | Massed Compute | Vast.ai | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 20 | 65 | Vast.ai +45 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 69 | 78 | Vast.ai +9 |
| Agent ergonomics | 13% (16.2 this run) | 56 | 57 | Vast.ai +1 |
| Security & auth | 14% (17.5 this run) | 61 | 72 | Vast.ai +11 |
| 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) | 51 | 81 | Vast.ai +30 |
| Transparency & trust | 7% (8.8 this run) | 61 | 62 | Vast.ai +1 |
| Negative events | ≤15 | -5 | 0 | |
| **Total** | | **42.3 · E** | **62.6 · B** | |

## Facts side by side

| Fact | Massed Compute | Vast.ai |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Massed Compute | Vast.ai Inc. |
| Hosted endpoint | `https://vm.massedcompute.com/api/v1` | `https://console.vast.ai/api/v0` |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | OAuth or key | API key |
| Pricing | Pay per use | Pay per use |
| Price for gpu compute | $5.43 per GPU-hour | not published |
| x402 | no | no |
| Licence | Proprietary service under Massed Compute's Terms & Conditions and End User Licence Agreement. The `massed-compute-mcp` wrapper on GitHub is MIT | Proprietary service under Vast.ai's Terms of Use Agreement. The `vastai` CLI and Python SDK on GitHub are MIT |
| Tools exposed | 17 | none |
| Read-only variant documented | yes | no |
| llms.txt | yes | yes |
| MCP registry | `io.github.Massed-Compute/mcp` | not listed |
| Last release | 2026-07-24 | 2026-10-02 |
| Terms last updated | couldn't be read | 2026-09-01 |
| Privacy policy last updated | 2026-07-22 | 2025-06-18 |
| Customer content may train models | couldn't be read | not found in the text |
| Terms restrict automated access | couldn't be read | yes |
| Terms restrict benchmarking | couldn't be read | yes |
| Terms or service can change without notice | couldn't be read | yes |
| Arbitration or class-action waiver | couldn't be read | yes |
| Popularity | 1 stars | 223 stars, 33k PyPI/wk |

## Verdicts

**Massed Compute.** The hosted MCP server and REST API accept OAuth grants or API tokens in read-only and full-access tiers, and all 17 tools carry typed schemas and safety annotations in a public server card. No status page, rate limit figures or API changelog were found, a launch has no idempotency key, and the governing terms could not be read.

**Vast.ai.** API keys can be limited by permission category and by resource ID, the REST API has a public OpenAPI 3.1 file, and the CLI ships weekly with a skill file for coding agents. Machines belong to independent hosts, prices move with the market, rate-limit thresholds are unpublished, and there is no SLA or free tier.

## Before you call either

### Massed Compute

1. Use `https://vm.massedcompute.com/api/v1`. The older docs at api-docs.massedcompute.com describe a separate marketplace API on `api.massedcompute.com` whose keys come from support.
2. Ask the owner for a read-only token unless the task must launch or terminate. Read-only credentials cannot call launch, restart, terminate or SSH key changes.
3. Call `gpu_inventory_list` and `images_list` before `instances_launch`. Product names and image IDs are free values, and SXM-only images do not run on PCIe cards.
4. Expect 402 on launch until the owner has added credit and set a recharge amount and threshold. List instances before retrying a launch.
5. Terminate to end billing. Stopping keeps the full hourly charge, and termination deletes the instance data.

### Vast.ai

1. Create a scoped key with `vastai create api-key --permissions` for the agent. A default key has full account access, billing and key management included
2. Pass `--raw` on every CLI command for JSON output, and `-y` on `vastai destroy instance`, which otherwise waits for a confirmation prompt
3. Register an SSH key with `vastai create ssh-key` before creating an instance, or the host is unreachable
4. Destroy instances when finished. A stopped instance still bills storage, and a zero balance without a saved card leads to deletion
5. Back off on HTTP 429 yourself when calling REST directly. The CLI retries 429 three times from 0.15 seconds
6. Filter searches with `verified=true` or the Secure Cloud option for sensitive data, and set a `dph_total` price cap

## Questions

### Which is better for AI agents, Massed Compute or Vast.ai?

Vast.ai scores 62.6 (B) on agent readiness against Massed Compute's 42.3 (E), and leads in 6 of 7 scored categories.

### Do Massed Compute and Vast.ai need an API key?

Massed Compute takes an API key or an OAuth sign-in. Vast.ai needs an API key.

### Can an agent call Massed Compute and Vast.ai without installing anything?

Yes. Massed Compute has a hosted endpoint at https://vm.massedcompute.com/api/v1 and Vast.ai at https://console.vast.ai/api/v0.


## For agents

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

## Other comparisons with Massed Compute or Vast.ai

- [Baseten vs Massed Compute](https://www.anchorterminal.com/compare/baseten-vs-massed-compute.md)
- [Baseten vs Vast.ai](https://www.anchorterminal.com/compare/baseten-vs-vast-ai.md)
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- [Hyperbolic vs Massed Compute](https://www.anchorterminal.com/compare/hyperbolic-vs-massed-compute.md)
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- [Massed Compute vs Northflank](https://www.anchorterminal.com/compare/massed-compute-vs-northflank.md)
- [Massed Compute vs Replicate Deployments](https://www.anchorterminal.com/compare/massed-compute-vs-replicate-deploy.md)
- [Massed Compute vs Runpod](https://www.anchorterminal.com/compare/massed-compute-vs-runpod.md)
- [Massed Compute vs Thunder Compute](https://www.anchorterminal.com/compare/massed-compute-vs-thunder-compute.md)
- [Massed Compute vs Verda](https://www.anchorterminal.com/compare/massed-compute-vs-verda.md)
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- [Nebius AI Cloud vs Vast.ai](https://www.anchorterminal.com/compare/nebius-ai-cloud-vs-vast-ai.md)
- [Northflank vs Vast.ai](https://www.anchorterminal.com/compare/northflank-vs-vast-ai.md)
- [Replicate Deployments vs Vast.ai](https://www.anchorterminal.com/compare/replicate-deploy-vs-vast-ai.md)
- [Runpod vs Vast.ai](https://www.anchorterminal.com/compare/runpod-vs-vast-ai.md)
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