Speechmatics

Speechmatics is an enterprise-grade speech intelligence platform headquartered in Cambridge, UK, offering highly accurate speech-to-text APIs supporting 55+ languages with batch and real-time transcription modes. The platform provides REST APIs for batch transcription job management and WebSocket APIs for low-latency real-time streaming transcription, along with speaker diarization, speaker identification, custom vocabulary, sentiment analysis, translation, and topic detection. Speechmatics also offers a Text-to-Speech API, a Voice Agent API (early access), and a Management API for programmatic account and API key management. Deployments are available as cloud SaaS, containerized on-premises, Kubernetes, and virtual appliance options.

Speechmatics publishes 7 APIs on the APIs.io network, including API Keys API, Jobs API, Projects API, and 4 more. Tagged areas include Speech Recognition, Speech-to-Text, Transcription, Real-Time Transcription, and Batch Transcription.

The Speechmatics catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Speechmatics’ developer surface includes authentication, documentation, engineering blog, pricing, developer portal, and 13 more developer resources.

🌐 Visit website 📡 Source on GitHub

48.6/100 developing ▬ flat Agent 28/100 agent aware Front door AI 5/6 prominent saas Full breakdown ↓
scored 2026-10-04 · rubric v0.23.0

AccessFreemiumSelf serve⚡ Free to try

2 published contracts

Speech Recognition Speech-to-Text TranscriptionReal-Time TranscriptionBatch TranscriptionSpeaker Diarization Text-to-Speech Voice AI NLP Audio Processing WebSocket REST Voice

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Developer Platform & API Ecosystem Management

BC-4270

API Keys

Kin Score

Kin Score How this is scored →
scored 2026-10-04 · rubric v0.23.0

Composite quality — 48.6/100 · developing

Contract Quality 11.1 / 19

Developer Ergonomics 6.8 / 15

Access Clarity 8.2 / 15

Operational Transparency 4.6 / 10

Contract Governance 0.9 / 9

Discoverability 5.0 / 8

Regulatory Posture 3.0 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 28/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 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

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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/speechmatics: 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 7

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

Speechmatics Realtime Transcription API

WebSocket API for low-latency real-time streaming transcription supporting live audio input, speaker diarization, and partial/final transcript events.

Speechmatics Management API

REST API for programmatic management of projects, API keys, usage tracking, and account administration.

Speechmatics Text-to-Speech API

REST API for converting text to natural-sounding speech with multiple voice options and language support.

Speechmatics API Keys API

The API Keys API from Speechmatics — 2 operation(s) for api keys.

Speechmatics Jobs API

The Jobs API from Speechmatics — 4 operation(s) for jobs.

Speechmatics Projects API

The Projects API from Speechmatics — 2 operation(s) for projects.

Speechmatics Usage API

The Usage API from Speechmatics — 1 operation(s) for usage.

Scroll for all 7

Open Collections 5

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Speechmatics Batch Transcription API Keys API

OPEN COLLECTION

Speechmatics Batch Transcription API Keys Jobs API

OPEN COLLECTION

Speechmatics Batch Transcription API Keys Projects API

OPEN COLLECTION

Speechmatics Batch Transcription API Keys Usage API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Speechmatics Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Speechmatics Rate Limits

11 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Speechmatics Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Speechmatics Context

13 classes · 18 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Speechmatics API Rules

6 rules · 5 warnings 1 info

SPECTRAL

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

JobConfig

14 properties

JSON SCHEMA

Examples 1

Example request and response payloads for these APIs.

Speechmatics Batch Transcription Job

7 fields

EXAMPLE

Security Posture 3

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

Speechmatics Authentication

apiKey · 1 scheme

SECURITY

Speechmatics Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Speechmatics Trust Center

SOC 2, ISO 27001, HIPAA, GDPR

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Speechmatics Agentic Access

15 operations · 7 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

Portal

Portal

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

TrustCenter

TrustCenter

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 3

Status, limits, changes, and where to get help

StatusPage

StatusPage

Discord

Discord

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: speechmatics
name: Speechmatics
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/speechmatics.png
url: https://raw.githubusercontent.com/api-evangelist/speechmatics/refs/heads/main/apis.yml
created: 2026-06-12
modified: 2026-06-12
artifacts:
- type: OpenAPI
  url: openapi/speechmatics-batch-transcription-api-openapi.yml
- type: OpenAPI
  url: openapi/speechmatics-management-api-openapi.yml
- type: JSONSchema
  url: json-schema/speechmatics-job-config.json
- type: JSONLDContext
  url: json-ld/speechmatics-context.jsonld
- type: Vocabulary
  url: vocabulary/speechmatics-vocabulary.yml
- type: Examples
  url: examples/speechmatics-batch-transcription-job.json
specificationVersion: '0.23'
description: 'Speechmatics is an enterprise-grade speech intelligence platform headquartered in Cambridge, UK, offering highly
  accurate speech-to-text APIs supporting 55+ languages with batch and real-time transcription modes. The platform provides
  REST APIs for batch transcription job management and WebSocket APIs for low-latency real-time streaming transcription, along
  with speaker diarization, speaker identification, custom vocabulary, sentiment analysis, translation, and topic detection.
  Speechmatics also offers a Text-to-Speech API, a Voice Agent API (early access), and a Management API for programmatic account
  and API key management. Deployments are available as cloud SaaS, containerized on-premises, Kubernetes, and virtual appliance
  options.

  '
x-docs-platform: docusaurus
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
tags:
- Speech Recognition
- Speech-to-Text
- Transcription
- Real-Time Transcription
- Batch Transcription
- Speaker Diarization
- Text-to-Speech
- Voice AI
- NLP
- Audio Processing
- WebSocket
- REST
- Voice
apis:
- aid: speechmatics:realtime-transcription-api
  name: Speechmatics Realtime Transcription API
  description: WebSocket API for low-latency real-time streaming transcription supporting live audio input, speaker diarization,
    and partial/final transcript events.
  humanURL: https://docs.speechmatics.com/speech-to-text/realtime
  baseURL: wss://eu2.rt.speechmatics.com/v2
  tags:
  - Real-Time Transcription
  - WebSocket
  - Streaming
  - Speech-to-Text
  properties:
  - type: Documentation
    url: https://docs.speechmatics.com/speech-to-text/realtime
  - type: APIReference
    url: https://docs.speechmatics.com/api-ref/realtime-transcription-websocket
- aid: speechmatics:management-api
  name: Speechmatics Management API
  description: REST API for programmatic management of projects, API keys, usage tracking, and account administration.
  humanURL: https://docs.speechmatics.com/api-ref/management/management-api
  baseURL: https://mp.speechmatics.com/v1
  tags:
  - Management
  - REST
  - APIKeys
  tags_raw:
  - Management
  - REST
  - API Keys
  properties:
  - type: Documentation
    url: https://docs.speechmatics.com/api-ref/management/management-api
  - type: APIReference
    url: https://docs.speechmatics.com/api-ref/management/management-api
- aid: speechmatics:text-to-speech-api
  name: Speechmatics Text-to-Speech API
  description: REST API for converting text to natural-sounding speech with multiple voice options and language support.
  humanURL: https://docs.speechmatics.com/text-to-speech
  baseURL: https://mp.speechmatics.com/v1
  tags:
  - Text-to-Speech
  - REST
  - Voice Synthesis
  properties:
  - type: Documentation
    url: https://docs.speechmatics.com/text-to-speech
- aid: speechmatics:speechmatics-api-keys-api
  name: Speechmatics API Keys API
  description: The API Keys API from Speechmatics — 2 operation(s) for api keys.
  humanURL: https://docs.speechmatics.com/speech-to-text/batch
  baseURL: https://asr.api.speechmatics.com/v2
  tags:
  - APIKeys
  tags_raw:
  - API Keys
  properties:
  - type: OpenAPI
    url: openapi/speechmatics-api-keys-api-openapi.yml
  - type: Documentation
    url: https://docs.speechmatics.com/speech-to-text/batch
  - type: APIReference
    url: https://docs.speechmatics.com/api-ref/batch/speechmatics-asr-rest-api
- aid: speechmatics:speechmatics-jobs-api
  name: Speechmatics Jobs API
  description: The Jobs API from Speechmatics — 4 operation(s) for jobs.
  humanURL: https://docs.speechmatics.com/speech-to-text/batch
  baseURL: https://asr.api.speechmatics.com/v2
  tags:
  - Job
  tags_raw:
  - Jobs
  properties:
  - type: OpenAPI
    url: openapi/speechmatics-jobs-api-openapi.yml
  - type: Documentation
    url: https://docs.speechmatics.com/speech-to-text/batch
  - type: APIReference
    url: https://docs.speechmatics.com/api-ref/batch/speechmatics-asr-rest-api
- aid: speechmatics:speechmatics-projects-api
  name: Speechmatics Projects API
  description: The Projects API from Speechmatics — 2 operation(s) for projects.
  humanURL: https://docs.speechmatics.com/speech-to-text/batch
  baseURL: https://asr.api.speechmatics.com/v2
  tags:
  - Project
  tags_raw:
  - Projects
  properties:
  - type: OpenAPI
    url: openapi/speechmatics-projects-api-openapi.yml
  - type: Documentation
    url: https://docs.speechmatics.com/speech-to-text/batch
  - type: APIReference
    url: https://docs.speechmatics.com/api-ref/batch/speechmatics-asr-rest-api
- aid: speechmatics:speechmatics-usage-api
  name: Speechmatics Usage API
  description: The Usage API from Speechmatics — 1 operation(s) for usage.
  humanURL: https://docs.speechmatics.com/speech-to-text/batch
  baseURL: https://asr.api.speechmatics.com/v2
  tags:
  - Usage
  properties:
  - type: OpenAPI
    url: openapi/speechmatics-usage-api-openapi.yml
  - type: Documentation
    url: https://docs.speechmatics.com/speech-to-text/batch
  - type: APIReference
    url: https://docs.speechmatics.com/api-ref/batch/speechmatics-asr-rest-api
common:
- type: CapabilityMap
  url: capabilities/speechmatics-capability-edges.yml
  name: Speechmatics Business Capability Map
- type: AgenticAccess
  url: agentic-access/speechmatics-agentic-access.yml
- type: TrustCenter
  url: security/speechmatics-trust-center.yml
- type: DomainSecurity
  url: security/speechmatics-domain-security.yml
- type: Authentication
  url: authentication/speechmatics-authentication.yml
- type: Website
  url: https://www.speechmatics.com/
- type: Documentation
  url: https://docs.speechmatics.com/
- type: GitHubOrganization
  url: https://github.com/speechmatics
- type: LinkedIn
  url: https://www.linkedin.com/company/speechmatics
- type: X
  url: https://x.com/Speechmatics
- type: Blog
  url: https://www.speechmatics.com/company/articles-and-news/articles
- type: Pricing
  url: https://www.speechmatics.com/pricing
- type: StatusPage
  url: https://status.speechmatics.com/
- type: Portal
  url: https://portal.speechmatics.com/
- type: Discord
  url: https://discord.gg/speechmatics
- type: Plans
  url: plans/speechmatics-plans-pricing.yml
- type: RateLimits
  url: rate-limits/speechmatics-rate-limits.yml
- type: FinOps
  url: finops/speechmatics-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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