Speechify

Speechify is a text-to-speech platform whose Speechify Voice API (also surfaced through Speechify Studio) synthesizes lifelike speech in 30+ languages from plain text or SSML. The REST API at https://api.sws.speechify.com offers non-streaming and streaming text-to-speech, a voice catalog, and instant voice cloning, authenticated with a Bearer API key.

Speechify publishes 2 API contracts indexed on the APIs.io network: Audio API and Voices API. Tagged areas include Artificial Intelligence, Text-to-Speech, Voice, Speech Synthesis, and Voice Cloning.

The Speechify catalog on APIs.io includes 1 Spectral governance ruleset.

Speechify’s developer surface includes authentication, documentation, engineering blog, and 8 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

27.1/100 thin ▬ flat Agent 19/100 agent aware Front door AI 6/6 dominant Heartbeat 98/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Artificial Intelligence Text-to-Speech Voice Speech Synthesis Voice Cloning

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 27.1/100 · thin

Contract Quality 9.6 / 19

Developer Ergonomics 3.8 / 15

Access Clarity 1.2 / 15

Operational Transparency 1.0 / 10

Contract Governance 1.2 / 9

Discoverability 5.0 / 8

Regulatory Posture 1.6 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 19/100 · 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 0 / 8

Request/Response Examples 0 / 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

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the AI & Biometrics 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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

10 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 7.9 — up to +18.4 composite points
Developer Ergonomics scores 25.0 — up to +15.0 composite points
Contract Quality scores 51.1 — up to +12.2 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/speechify/apis.yml: open an issue on github.com/api-evangelist/speechify to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Speech and Voice AI	covered	46.0	-	-
Discord App Directory (builders of apps on Discord)	covered	46.0	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 2

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

Speechify Audio API

The Audio API from Speechify — 2 operation(s) for audio.

Speechify Voices API

The Voices API from Speechify — 2 operation(s) for voices.

Open Collections 3

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

Speechify Voice Audio API

OPEN COLLECTION

Speechify Voice Audio Voices API

OPEN COLLECTION

Speechify Voice API

OPEN COLLECTION

Speechify API pricing

Not yet checked against Speechify's own pricing page. Compiled by API Evangelist on 2026-06-21 from speechify.com/pricing-api/; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Starter (Free) free	Free
Pay-As-You-Go usage	—
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Requests Per Minute (RPM): see provider documentation requests
Concurrent Streams: see provider documentation concurrent requests
Characters Per Period: 50000 on Starter; unlimited on Pay-As-You-Go characters

Compiled by API Evangelist, not yet checked against Speechify's documentation. All 4 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Speechify Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Speechify Rate Limits

4 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Speechify

SLA

FinOps 1

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

Speechify Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Speechify API Rules

59 rules · 57 errors 1 warnings 1 info

SPECTRAL

Security Posture 2

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

Speechify Authentication

http · 1 scheme

SECURITY

Speechify Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Speechify Agentic Access

5 operations · 4 acting

AGENTIC

Resources

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 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: speechify
url: https://raw.githubusercontent.com/api-evangelist/speechify/refs/heads/main/apis.yml
name: Speechify
kind: company
description: Speechify is a text-to-speech platform whose Speechify Voice API (also surfaced through Speechify Studio) synthesizes
  lifelike speech in 30+ languages from plain text or SSML. The REST API at https://api.sws.speechify.com offers non-streaming
  and streaming text-to-speech, a voice catalog, and instant voice cloning, authenticated with a Bearer API key.
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
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/speechify.png
x-docs-platform: fern
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
tags:
- Artificial Intelligence
- Text-to-Speech
- Voice
- Speech Synthesis
- Voice Cloning
tags_raw:
- AI
- Text to Speech
- Voice
- Speech Synthesis
- Voice Cloning
created: '2026-06-21'
modified: '2026-06-21'
specificationVersion: '0.23'
apis:
- aid: speechify:speechify-audio-api
  name: Speechify Audio API
  description: The Audio API from Speechify — 2 operation(s) for audio.
  humanURL: https://docs.sws.speechify.com/v1/api-reference/api-reference/tts/audio/speech
  baseURL: https://api.sws.speechify.com/v1
  tags:
  - Audio
  properties:
  - type: OpenAPI
    url: openapi/speechify-audio-api-openapi.yml
  - type: Documentation
    url: https://docs.sws.speechify.com/tts/overview/welcome
  - type: APIReference
    url: https://docs.sws.speechify.com/v1/api-reference/api-reference/tts/audio/speech
  - type: Postman
    url: collections/speechify.postman_collection.json
  - type: Documentation
    url: https://docs.sws.speechify.com/docs/features/streaming
  - type: APIReference
    url: https://docs.sws.speechify.com/v1/api-reference/api-reference/tts/audio/stream
  - type: APIReference
    url: https://docs.sws.speechify.com/v1/api-reference/api-reference/tts/voices/delete
  - type: Documentation
    url: https://docs.sws.speechify.com/v1/docs/features/voice-cloning
- aid: speechify:speechify-voices-api
  name: Speechify Voices API
  description: The Voices API from Speechify — 2 operation(s) for voices.
  humanURL: https://docs.sws.speechify.com/v1/api-reference/api-reference/tts/audio/speech
  baseURL: https://api.sws.speechify.com/v1
  tags:
  - Voice
  tags_raw:
  - Voices
  properties:
  - type: OpenAPI
    url: openapi/speechify-voices-api-openapi.yml
  - type: Documentation
    url: https://docs.sws.speechify.com/tts/overview/welcome
  - type: APIReference
    url: https://docs.sws.speechify.com/v1/api-reference/api-reference/tts/audio/speech
  - type: Postman
    url: collections/speechify.postman_collection.json
  - type: Documentation
    url: https://docs.sws.speechify.com/docs/features/streaming
  - type: APIReference
    url: https://docs.sws.speechify.com/v1/api-reference/api-reference/tts/audio/stream
  - type: APIReference
    url: https://docs.sws.speechify.com/v1/api-reference/api-reference/tts/voices/delete
  - type: Documentation
    url: https://docs.sws.speechify.com/v1/docs/features/voice-cloning
common:
- type: AgenticAccess
  url: agentic-access/speechify-agentic-access.yml
- type: DomainSecurity
  url: security/speechify-domain-security.yml
- type: Authentication
  url: authentication/speechify-authentication.yml
- type: GitHubOrganization
  url: https://github.com/SpeechifyInc
- type: LinkedIn
  url: https://www.linkedin.com/company/speechify
- type: Website
  url: https://speechify.com
- type: Documentation
  url: https://docs.sws.speechify.com
- type: Plans
  url: plans/speechify-plans-pricing.yml
- type: RateLimits
  url: rate-limits/speechify-rate-limits.yml
- type: FinOps
  url: finops/speechify-finops.yml
- url: https://speechify.com/blog
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Speechify API — frequently asked questions

Does Speechify have an API?

Yes. APIs.io lists 2 APIs from Speechify, including Speechify Audio API and Speechify Voices API.

Is there an OpenAPI specification for the Speechify API?

Yes. APIs.io indexes 2 OpenAPI specifications for Speechify, each linked for download from this page.

How do I authenticate with the Speechify API?

Speechify uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Speechify Authentication.

How much does the Speechify API cost?

APIs.io lists 3 pricing plans for Speechify, with each plan's price, limits and inclusions under Pricing on this page.

Is the Speechify API ready for AI agents?

Speechify has a Kin Score of 27.1 out of 100 (thin) and an Agent Readiness score of 19.0 (agent-aware), scored by API Evangelist on 2026-11-06.

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