# Fix list: Vast.ai

From Anchor Terminal's listing at https://www.anchorterminal.com/tools/vast-ai, the October 2026 research run, assessed 8 October 2026. Grade B, 62.6 out of 100.

This is everything the published grade says the listing lacks, the biggest possible gain to the total first. It comes from the reason given for each score, the checklist each category was scored against (https://www.anchorterminal.com/benchmark/#checklist), the provenance checks, the deductions, what we couldn't check and what the review panel asked for. A fix counts at the next check, once it's public.

For a coding agent working on Vast.ai: work through the items below in the product, its docs and its public pages. Each category gives the reason for its score, with the points each checklist item earned, and the checklist itself, so the gap is the items that earned less than their points. Change the product, not the wording, and keep a note of what you changed and where it's published.

## 1. Payments & pricing, 20 out of 100, up to 10 more on the total

Why it scored 20: No x402, MPP or L402 found (0). Live per-GPU rates are public without a login at vast.ai/pricing, and billing units (per second for GPU and storage, per byte for bandwidth) are documented. Rates are set per listing by hosts, so there is no fixed list (20). No free tier or trial found. Credit is prepaid with a $5 minimum deposit (0). Signup is a browser flow with email verification. Further keys can be created through the API once an account and key exist (0).

The checklist (https://www.anchorterminal.com/benchmark/#checklist-payments):

The published rubric, also on the [x402 page](https://www.anchorterminal.com/x402/).

- 40, a machine payment protocol (x402, MPP or L402) on the tool's own endpoints. 10 to 30 when it covers only some endpoints or only goes through a third party, and the note says which.
- 20, per-call or per-unit pricing published without a login. 10 for public plan-only pricing, 0 for "contact sales" or prices behind a login.
- 20, a free tier or trial that doesn't need a card.
- 20, autonomous onboarding, meaning an agent can get access without a person signing up in a browser (keyless use, x402, a programmatic key API).

Payment platforms and agent wallets rarely charge for their own API over a machine protocol, so the first line has steps for them, and the highest one that applies counts. 40 when x402, MPP or L402 runs on all their own endpoints, 30 when it runs on part of their own API, 25 when their merchants can accept one, 20 for running a facilitator, 15 for paying as a buyer, and 0 when the only protocol is their own. Merchant acceptance sits above a facilitator because the platform's own customers can charge agents through it, while a facilitator settles for sellers who wire up the protocol themselves. The counter-argument (a facilitator does more for the protocol as a whole) has a point. Each note says which step applied.

Open-source software you run yourself is scored on its hosted or paid option if it has one. A free, self-hosted package with nothing to buy gets 20, 20 and 20 for the last three lines, and 0 to 40 for the first only if it ships a payment protocol.

## 2. Reliability, 65 out of 100, up to 7 more on the total

Why it scored 65: Graded as a hosted service. status.vast.ai is Vast.ai's own page with three components (vast, console, serverless) and 30-day bars built from roughly hourly checks, with no incident write-ups (20). The raw check logs run from 12 July to 8 October 2026. The console and serverless checks each failed 5 times of 2,000 (3, 4, 5, 7 and 29 August) and the website once, never twice in a row, so we read the record as minor incidents only. The page covers Vast.ai's control plane and not the independent hosts' machines (20). Rate limits are described as a minimum interval per endpoint and identity, but thresholds are unpublished apart from an `x-rateLimit` value on 2 of 89 operations in the OpenAPI file (5 of 15). 429 is documented with backoff advice and the CLI retries it three times, but there is no `Retry-After` header and no idempotency key for instance creation (10 of 15). No SLA found, and the terms say availability is not guaranteed (0). Instances, serverless and the REST API carry no beta label (10).

The checklist (https://www.anchorterminal.com/benchmark/#checklist-reliability):

Hosted APIs, MCP servers, models and platforms.

- 20, a public status page with component history (Statuspage, Instatus, BetterStack or the vendor's own).
- 0 to 30, the incident record for the last 90 days on that page. 30 for a clean record or trivial incidents only, 20 for minor incidents only, 10 for one major outage (an hour or more of a core API down, or errors across the board), 0 for several. 5 when there's no history we could read, and the note says so.
- 15, rate limits documented with numbers.
- 15, documented 429 or overload handling (Retry-After, backoff guidance), and idempotency keys or safe-retry guidance where writes are involved.
- 10, an SLA published for any paid tier.
- 10, the surface agents use is generally available, not beta or preview.

Local packages, SDKs, frameworks and stdio MCP servers.

- 20, installs from an official package with supported runtimes stated.
- 25, a public CI and test suite, passing on the default branch.
- 0 to 25, open crash or regression issues relative to activity (25 for few and handled, 0 for many, old and unanswered).
- 15, semver discipline and breaking changes called out in a changelog.
- 15, version 1.0 or later, or declared stable.

Protocols are read from their reference implementations, the public facilitators or servers, spec stability and test vectors.

## 3. Agent ergonomics, 57 out of 100, up to 7 more on the total

Why it scored 57: No MCP server for account actions. The CLI skill file is about 19 KB, `--raw` returns JSON on every command, and the v1 instances route supports column selection (18 of 25). Search takes filter operators, sort fields and a price cap, and v1 instances use keyset pagination with at most 25 a page (16 of 20). The usual error body has `success`, `error` and `msg`, but some endpoints omit fields and 429 is often plain text (10 of 20). No idempotency keys were found in the OpenAPI file. The CLI retries only 429, and `vastai destroy instance` asks for confirmation unless `-y` is passed (5 of 20). Templates supply launch defaults. The only official SDK is Python, and the docs send other languages to raw REST (8 of 15).

The checklist (https://www.anchorterminal.com/benchmark/#checklist-ergonomics):

- 0 to 25, context cost. For MCP, the number and size of the tool definitions (25 for ten or fewer compact tools, 15 for 11 to 30, 5 for more than 30, plus up to 10 back for toolsets, dynamic loading or read-only subsets). For APIs, whether responses can be sized (field selection, limits, summaries).
- 20, pagination, filtering and output-size controls.
- 20, actionable, documented error responses, codes and messages an agent can recover from.
- 20, idempotency or safe retries, and for MCP the `readOnlyHint` and `destructiveHint` annotations.
- 15, sensible defaults, few required parameters, and official SDKs in at least two languages.

Models are read for tool use, structured output, prompt caching, context length, batch and SDKs. Frameworks for how much code and how many defaults a tool-calling agent with MCP needs.

## 4. Security & auth, 72 out of 100, up to 4.9 more on the total

Why it scored 72: Keys can be scoped to 11 permission categories and narrowed by constraints to resource IDs, are shown once, and can be reset or deleted with immediate effect (30). The rate-limit page names an `api_key` query parameter as part of a caller's identity while the authentication page shows only the Bearer header. We took 5 of the checklist's 10 points for a key that can travel in a URL, a judgement call because the option is acknowledged but not taught (25 of 30). Read-only categories and per-instance constraints exist. The CLI confirms a destroy, and Vast.ai's auth.md asks agents to confirm paid or destructive actions, but nothing on the server enforces approval and default keys have full access (15 of 20). The service runs the customer's own containers and returns their logs (10). `vastai show audit-logs` returns account action history. Its retention and fields were not reviewed (10 of 15). A vulnerability disclosure policy dated 23 July 2025 has safe harbour, triage within 5 business days and a discretionary bounty. Vast.ai states SOC 2 Type 2 with the report under NDA. There is no security.txt and no public advisories were found, and the security FAQ says individual hosts may have less formal security (12 of 20).

The checklist (https://www.anchorterminal.com/benchmark/#checklist-security):

- 0 to 30, the credential model. 30 for OAuth 2.1 with scopes, or scoped and revocable keys with rotation. 20 for plain revocable API keys. 10 for one all-powerful key. 10 off when a secret can travel in a URL query string as a documented option.
- 0 to 20, read-only or least-privilege modes, and confirmation or approval for destructive actions.
- 0 to 15, prompt-injection posture where the tool returns untrusted content (documented mitigations or guidance). A tool that returns no untrusted content gets 10.
- 0 to 15, audit logs or per-call visibility for the operator.
- 0 to 20, a security programme. security.txt or a disclosure policy, a bug bounty, SOC 2 or ISO 27001, advisories handled in public.

Models are read for retention, whether API data trains models (and whether that's off by default), zero-retention options and certifications. Frameworks for telemetry defaults, approval hooks, guardrails and sandboxing.

## 5. Schema & documentation, 78 out of 100, up to 3.6 more on the total

Why it scored 78: Public OpenAPI 3.1 file with 66 paths and 89 operations, plus the YAML source in the CLI repository (25). llms.txt on both vast.ai and docs.vast.ai, with every docs page served as Markdown (10). Operation descriptions give the matching CLI command and rules such as template precedence, and the SKILL.md files list quirks and common errors, though the API introduction steers most users to the CLI (15 of 20). Request bodies are typed, with 37 enums and required fields marked. Search filters are operator objects and several routes are not REST-shaped, such as PUT /asks/{id}/ to create an instance (10 of 15). Examples on most operations and 400, 401 and 429 responses on most, but the docs say the error body varies by endpoint (11 of 15). Routes are versioned v0 and v1 and the CLI has tagged releases. No API changelog was found in the docs index (7 of 15).

The checklist (https://www.anchorterminal.com/benchmark/#checklist-schema):

APIs and MCP servers.

- 25, a machine-readable contract (a public OpenAPI file or similar; for MCP, typed JSON Schema inputs on every tool).
- 10, llms.txt or Markdown docs served for agents.
- 0 to 20, descriptions that say what a tool is for, when to use it and when not to, read from the tool definitions in the source or the API reference.
- 0 to 15, typed inputs with enums, constraints and required fields, and no free-form JSON blobs.
- 0 to 15, examples and documented error responses.
- 15, versioning and a public changelog.

Models are read from the API reference, the OpenAPI file, llms.txt, the structured-output and tool-use docs and the model cards. Frameworks from docs a model can follow, typed interfaces, examples and the API reference.

## 6. Transparency & trust, 62 out of 100, up to 3.3 more on the total

Made of editorial 45, provenance 79.

Why it scored 62: A closed service with an MIT CLI and SDK. The Terms of Use Agreement of 1 September 2026 prohibits scripts and automated access to the services without a separate written agreement, which conflicts with the public API and agent tooling (17 of 30). The compliance page says data is destroyed when an instance is deleted, and the DPA allows return or deletion on written notice within 30 days of termination. The privacy policy of 18 June 2025 is written for website users, gives no retention periods, allows targeted advertising and contains an unfilled `[INSERT HYPERLINK]` placeholder (15 of 30). No deprecation policy was found, and the terms allow changes or discontinuation without notice. v0 and v1 routes coexist (3 of 20). The DPA names five sub-processors without locations and gives new ones only on request. Host location is shown per listing and can be filtered (10 of 20).

The checklist (https://www.anchorterminal.com/benchmark/#checklist-transparency):

- 0 to 30, source availability and licence clarity. 30 for open source under an OSI licence, 15 for closed with clear terms, 0 for unclear terms.
- 0 to 30, data handling and retention statements that agree with each other (privacy policy, DPA, retention periods, subprocessors).
- 0 to 20, a deprecation policy or notices with dates.
- 0 to 20, telemetry disclosed with an opt-out (local software), or subprocessors and data locations disclosed (hosted).

The other half of Transparency and trust is the provenance score, computed from checked facts (below). The category score is the mean of the two.

Provenance checks not met in full (half of this category, computed from checked facts):

- Domain age: vast.ai, registered 2017-12-16 (8 years) (11 of 15)
- Terms of service: read, states 6 of the 7 things a reader expects, and has 3 clauses that cost points (3.1 of 10)
- security.txt: not found (0 of 10)

## 7. Maintenance & community, 81 out of 100, up to 1.7 more on the total

Why it scored 81: `vastai` 1.8.3 was published to PyPI on 2 October 2026 (30). Twelve tagged releases between 27 July and 2 October 2026 (20). The repository had 54 open issues and pull requests. Of the 30 most recently opened, 22 had no comments, among them issues from June, August and September 2026. Vast.ai lists 24/7 chat support and Discord, which we did not test (10 of 25). The CLI and Python SDK are current and ship together (15). Three CI workflows cover the installer, publishing and SDK tests. An open issue of 6 September 2026 reports hard-pinned dependencies, and we did not check whether CI passes (6 of 10).

The checklist (https://www.anchorterminal.com/benchmark/#checklist-maintenance):

- 0 to 30, time since the last release, or the last published model or API change for a closed service. 30 within 30 days, 20 within 90, 10 within 180, 0 older.
- 20, at least three releases or dated changelog entries in the last 90 days.
- 0 to 25, responsiveness. Issues and pull requests answered on GitHub (the open issues and how recent the replies are). For closed services, a public changelog and a support or community channel that answers, 0 to 15.
- 15, presence in the official MCP registry under a verified namespace (MCP servers), or current official SDKs (APIs and models).
- 10, package health, current dependencies and CI.

Models are read for deprecation notice periods and model churn rather than release counts.

## What we couldn't check

What we couldn't read counted as absent. Publishing it on a page a plain HTTP fetch can read (not only in a browser) lets the next check count it.

- unchecked: per-GPU prices. The pricing page loads rates with JavaScript, and the public JSON feed's terms ask for a data licence before use in any index or benchmark, so we did not read it and recorded no unit prices.
- unchecked: whether CI passes on the default branch, and the retention and fields of the account audit log.
- unchecked: response times on live chat and Discord.
- The terms of 1 September 2026 prohibit scripts and automated access to the services without a separate written agreement. We could not establish whether Vast.ai treats the published API, CLI and agent skills as that authorisation.
- Whether the REST API still accepts the key as an `api_key` query parameter is not stated on the authentication page; the rate-limit page implies it.
- The lead's interface (CLI, Python SDK, REST API, serverless endpoints) was correct. The MCP server Vast.ai lists is documentation only.

## Weaknesses

- No SLA. The terms say availability is not guaranteed and the service can change without notice
- Rate-limit thresholds are unpublished and 429 responses carry no `Retry-After` header
- No free tier. Credit is prepaid with a $5 minimum deposit after a browser signup and email verification
- Hosts are independent. The security FAQ says individual hosts may have less formal security than Secure Cloud data centres
- The terms of 1 September 2026 prohibit scripts and automated access to the services without a separate written agreement, which conflicts with the public API

## What costs an agent a turn today

The notes we give agents before they call it. Each one is a workaround an agent shouldn't need.

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

## When it's done

Send what changed and where it's published as a dispute (https://www.anchorterminal.com/builders/#disputes, or `POST https://www.anchorterminal.com/api/v1/contact` with `"kind": "dispute"`). Disputes are answered in public, and the listing is checked again by the same checklist. Paying for an audit or a listing claim changes nothing here.