PlayHT Voice Cloning API by PlayHT

# Fix list: PlayHT Voice Cloning API

From Anchor Terminal's listing at https://www.anchorterminal.com/tools/playht-voice-cloning, the October 2026 research run, assessed 1 October 2026. Grade F, 4.2 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 PlayHT Voice Cloning API: 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. Reliability, 0 out of 100, up to 20 more on the total

Why it scored 0: Retired. On 2026-10-01 api.play.ht didn't resolve, so there's nothing to answer a call. Third-party migration guides put the API going dark around 26 July 2025 and the whole platform closing on 31 December 2025. No status page (0), no incident record (0), and the historical rate limits and 429 codes describe a service that's gone (0).

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.

## 2. Security & auth, 0 out of 100, up to 17.5 more on the total

Why it scored 0: No live surface. Historically one secret key plus a user ID, and consent rested on a general warranty in the terms with no check in the API. Clones and audio were reportedly deleted at shutdown with no export. Nothing left to score (0).

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.

## 3. Agent ergonomics, 0 out of 100, up to 16.3 more on the total

Why it scored 0: No live surface to call, so every line scores 0.

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. Payments & pricing, 0 out of 100, up to 12.5 more on the total

Why it scored 0: Nothing can be bought. No x402 was ever documented (0), no live pricing (0), no free tier (0), no signup (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.

## 5. Schema & documentation, 31 out of 100, up to 11.2 more on the total

Why it scored 31: What's left is the docs, still served at docs.play.ht. No OpenAPI file confirmed (0) and we didn't confirm an llms.txt (0). The clone endpoint page states the purpose and limits (8 of 20). Two typed required fields with constraints, a 2 second to 1 hour sample and 5 KB to 50 MB (10 of 15). Response codes listed (201, 400, 401, 403, 415, 429, 500) with examples (8 of 15). Versioned `/api/v2` path, no changelog found (5 of 15). The pages carry no shutdown notice, so a model reading them would call an API that doesn't exist.

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. Maintenance & community, 0 out of 100, up to 8.8 more on the total

Why it scored 0: Last Python SDK release 0.1.14 on 2025-03-29, nothing since (0). No releases or changelog entries in the last 90 days (0). No support channel (0). SDKs abandoned (0). No package health (0).

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.

## 7. Transparency & trust, 36 out of 100, up to 5.6 more on the total

Made of editorial 5, provenance 66.

Why it scored 36: SDKs remain on GitHub under Apache-2.0, while the terms survive only as Internet Archive copies (5 of 30). No live privacy policy or retention statement, and the deletion of clones at shutdown is reported by third parties, not by PlayHT (0 of 30). We found no shutdown notice from PlayHT itself (0 of 20). No subprocessors or data locations (0 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: play.ht, registered 2016-11-29 (9 years) (11 of 15)
- Status page: not found (0 of 10)
- Changelog: not found (0 of 10)
- security.txt: could not be fetched (0 of 10)

## Deductions

Each comes off the total. A fixed and documented problem counts for less at the next check.

- 2026-10-01. docs.play.ht still documents `POST /api/v2/cloned-voices/instant` with no shutdown notice, and play.ht served its old marketing page, while api.play.ht doesn't resolve and the platform closed on 2025-12-31. An endpoint removed while still advertised. https://docs.play.ht/reference/api-create-instant-voice-clone and https://inworld.ai/resources/migrate-from-playht

## 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.

- We found no shutdown notice or data-deletion statement from PlayHT itself, only third-party migration guides
- Whether play.ht resolves for everyone. Last week's check said it didn't, today's fetch returned the old marketing page
- Whether docs.play.ht still serves an llms.txt

## Weaknesses

- Shut down, api.play.ht doesn't resolve
- Cloned voices reportedly deleted at shutdown with no export
- Docs and marketing pages still advertise the API with no shutdown notice
- No consent or verification step was ever in the 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.

- Don't call `api.play.ht`. The host doesn't resolve
- Ignore docs.play.ht for new work. It documents an API that no longer exists
- Re-create voices with another vendor from the original recordings, the clones can't be recovered

## What the review panel asked for

- Shutdown notice on docs
- a dated shutdown notice
- a data deletion statement

## 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.