Speechly

Speechly was a real-time spoken language understanding (SLU) and streaming speech recognition platform from a Finnish startup, offering low-latency voice transcription, intent/entity parsing, written language understanding (WLU), batch audio processing, and audio/text moderation through a gRPC API with browser, React, iOS, Unity/.NET, Python and Go client SDKs and a command-line interface. Speechly was acquired by Roblox; the standalone product and hosted API have since been discontinued — speechly.com now redirects to roblox.com, the api.speechly.com and docs.speechly.com hosts no longer resolve, and the github.com/speechly organization was archived on 2025-01-07. Its open-source client SDKs and protobuf/gRPC API definitions remain publicly available and are cataloged here by the API Evangelist enrichment pipeline.

Speechly publishes 1 API on the APIs.io network. Tagged areas include Company, Speech Recognition, Voice, Spoken Language Understanding, and Speech-to-Text.

Speechly’s developer surface includes CLI, authentication, and 17 more developer resources.

🌐 Visit website 📡 Source on GitHub

22.7/100 emerging ▬ flat Agent 16/100 agent aware self hosted · MIT Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs

Company Speech Recognition VoiceSpoken Language UnderstandingSpeech-to-Text Content Moderation Machine-Learning gRPC Artificial Intelligence

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 22.7/100 · emerging

Contract Quality 6.0 / 23

Developer Ergonomics 4.7 / 18

Access Clarity 0.0 / 18

Operational Transparency 2.2 / 12

Contract Governance 0.5 / 11

Discoverability 6.8 / 9

Open Source Surface 2.5 / 10

Agent readiness — 16/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 90 points between them, because the conditional facet above carries the other 10. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 90% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/speechly: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Speechly API

Speechly's gRPC API surface: Identity (access tokens), SLU (streaming spoken language understanding), WLU (written language understanding), Batch audio processing, Config/Model ...

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Speechly Authentication

oauth2-like/bearer · 1 scheme

SECURITY

Speechly Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

X-MCPServerCandidate

X-MCPServerCandidate

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Conformance

Lifecycle

DataModel

Conventions

Build 5

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

SourceCode

Packages

SDKs

CLI

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

IssueTracker

IssueTracker

Releases

Releases

Commercial 1

Pricing, plans, and the legal terms of use

License

License

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

ParentCompany

ParentCompany

Protobuf

Protobuf

Source (apis.yml)

aid: speechly
name: Speechly
description: Speechly was a real-time spoken language understanding (SLU) and streaming speech recognition platform from a
  Finnish startup, offering low-latency voice transcription, intent/entity parsing, written language understanding (WLU),
  batch audio processing, and audio/text moderation through a gRPC API with browser, React, iOS, Unity/.NET, Python and Go
  client SDKs and a command-line interface. Speechly was acquired by Roblox; the standalone product and hosted API have since
  been discontinued — speechly.com now redirects to roblox.com, the api.speechly.com and docs.speechly.com hosts no longer
  resolve, and the github.com/speechly organization was archived on 2025-01-07. Its open-source client SDKs and protobuf/gRPC
  API definitions remain publicly available and are cataloged here by the API Evangelist enrichment pipeline.
deliveryModel:
  model: self-hosted
  license: MIT
  open_source: true
  commercial: false
  callable_host: false
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - url: http://speechly.com
    status: 301
    note: declared website redirects to https://www.roblox.com:443/ — a different registrable domain (speechly.com -> roblox.com),
      possible rename or acquisition (probed 2026-09-03, roadmap#169)
  generated: '2026-07-22'
  method: derived
image: https://avatars.githubusercontent.com/u/25465412?v=4
url: https://raw.githubusercontent.com/api-evangelist/speechly/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- seedcamp
x-tier: stub
x-tier-reason: portfolio-lead
x-status: discontinued
x-acquired-by: roblox
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Speech Recognition
- Voice
- Spoken Language Understanding
- Speech-to-Text
- Content Moderation
- Machine-Learning
- gRPC
- Artificial Intelligence
tags_raw:
- Company
- Speech Recognition
- Voice
- Spoken Language Understanding
- Speech-to-Text
- Content Moderation
- Machine Learning
- gRPC
- Artificial Intelligence
apis:
- name: Speechly API
  description: 'Speechly''s gRPC API surface: Identity (access tokens), SLU (streaming spoken language understanding), WLU
    (written language understanding), Batch audio processing, Config/Model management, Analytics, and audio/text Moderation.
    The hosted service has been discontinued; protobuf definitions are retained verbatim under grpc/.'
  humanURL: https://github.com/speechly/api
  baseURL: https://api.speechly.com
  x-status: discontinued
  properties:
  - type: Protobuf
    url: grpc/_index.yml
  - type: Authentication
    url: authentication/speechly-authentication.yml
  - type: Conformance
    url: conformance/speechly-conformance.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: ParentCompany
  url: https://apis.io/providers/roblox/
  name: Roblox
  x-relationship: acquired
  x-evidence: Speechly was acquired by Roblox; the standalone product and hosted API have since been discontinued — speechly.
- type: IssueTracker
  url: https://github.com/speechly/api/issues
- type: Releases
  url: https://github.com/speechly/api/releases
- type: License
  name: MIT
  url: https://github.com/speechly/api/blob/master/LICENSE
- type: Website
  url: http://speechly.com
- type: GitHubOrganization
  url: https://github.com/speechly
- type: SourceCode
  url: https://github.com/speechly/api
- type: Packages
  url: packages/speechly-packages.yml
- type: SDKs
  url: packages/speechly-packages.yml
- type: CLI
  url: cli/speechly-cli.yml
- type: Protobuf
  url: grpc/_index.yml
- type: Authentication
  url: authentication/speechly-authentication.yml
- type: Conformance
  url: conformance/speechly-conformance.yml
- type: Lifecycle
  url: lifecycle/speechly-lifecycle.yml
- type: DomainSecurity
  url: security/speechly-domain-security.yml
- type: LLMsTxt
  url: llms/speechly-llms.txt
- type: X-MCPServerCandidate
  url: mcp/speechly-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: DataModel
  url: data-model/speechly-data-model.yml
- type: Conventions
  url: conventions/speechly-conventions.yml
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 3
  pass: local-v1

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