Unreal Speech

Unreal Speech is a low-cost, high-scale text-to-speech (TTS) API for turning text into natural-sounding speech. It exposes a small REST surface - a low-latency HTTP streaming endpoint, a synchronous speech endpoint that returns an MP3 plus per-word or per-sentence timestamps, and an asynchronous synthesis tasks endpoint for long-form audio up to 500,000 characters. Requests are authenticated with a Bearer API key issued from the dashboard, and pricing is metered per character with a free monthly allowance.

Unreal Speech publishes 3 API contracts indexed on the APIs.io network, including Stream API, Synthesis Tasks API, and 1 more. Tagged areas include Text-to-Speech, Speech Synthesis, Audio, Voice, and Artificial Intelligence.

The Unreal Speech catalog on APIs.io includes 1 Spectral governance ruleset.

Unreal Speech’s developer surface includes pricing, authentication, documentation, and 8 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

35.3/100 thin ▬ flat Agent 22/100 agent aware Front door AI 3/6 light Heartbeat 0/100 dormant saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Text-to-Speech Speech Synthesis Audio Voice Artificial Intelligence

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 35.3/100 · thin

Contract Quality 9.4 / 19

Developer Ergonomics 4.5 / 15

Access Clarity 5.1 / 15

Operational Transparency 3.2 / 10

Contract Governance 1.2 / 9

Discoverability 5.0 / 8

Regulatory Posture 0.8 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 22/100 · 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 5 / 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 Ask about this →
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) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →

9 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 29.8 — up to +14.0 composite points Ask about this →
Access Clarity scores 34.0 — up to +13.2 composite points Ask about this →
Contract Quality scores 50.2 — up to +12.5 composite points Ask about this →

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.

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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 3

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

Unreal Speech API

Synchronous text-to-speech returning an MP3 and timestamp URLs.

Unreal Speech Stream API

Low-latency HTTP streaming synthesis returning audio bytes.

Unreal Speech Synthesis Tasks API

Asynchronous synthesis for long-form audio via submit-and-poll.

Open Collections 4

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

Unreal Speech API

OPEN COLLECTION

Unreal Speech Stream API

OPEN COLLECTION

Unreal Speech Synthesis Tasks API

OPEN COLLECTION

Unreal Speech API

OPEN COLLECTION

Unreal Speech API pricing

Prices published by Unreal Speech, read 2026-10-07 from unrealspeech.com/pricing.

Plan	Price
Free	$0 Includes: 250K characters 6 hours of audio
Basic	$4.99/mo Includes: 3M characters 67 hours of audio
Plus	$499/mo Includes: 42M characters 933 hours of audio
Pro	$1499/mo Includes: 150M characters 3K hours of audio
Enterprise	$4999/mo Includes: 625M characters 14K hours of audio
Custom	High Volume Inquiry Includes: 1B+ characters Volume discounts

Plan details, limits and sources →

Rate limits

Free plan rate limit: Free 2
Basic plan rate limit: Basic 8
Pro plan rate limit: Pro 32

Rate-limit details →

Pricing Plans 1

Published pricing tiers and plan structures.

Unreal Speech Plans Pricing

6 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Unreal Speech Rate Limits

3 limits

RATE LIMITS

FinOps 1

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

Unreal Speech Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Unreal Speech API Rules

60 rules · 58 error-severity 1 warn-severity 1 info-severity

SPECTRAL

Security Posture 2

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

Unreal Speech Authentication

http · 1 scheme

SECURITY

Unreal Speech Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Unreal Speech Agentic Access

4 operations · 3 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 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 2

The organization behind the API

LinkedIn

Website

Website

Source (apis.yml)

aid: unrealspeech
url: https://raw.githubusercontent.com/api-evangelist/unrealspeech/refs/heads/main/apis.yml
name: Unreal Speech
kind: company
description: Unreal Speech is a low-cost, high-scale text-to-speech (TTS) API for turning text into natural-sounding speech.
  It exposes a small REST surface - a low-latency HTTP streaming endpoint, a synchronous speech endpoint that returns an MP3
  plus per-word or per-sentence timestamps, and an asynchronous synthesis tasks endpoint for long-form audio up to 500,000
  characters. Requests are authenticated with a Bearer API key issued from the dashboard, and pricing is metered per character
  with a free monthly allowance.
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: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/unrealspeech.png
x-docs-platform: readme
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-10-17
tags:
- Text-to-Speech
- Speech Synthesis
- Audio
- Voice
- Artificial Intelligence
tags_raw:
- Text to Speech
- TTS
- Speech Synthesis
- Audio
- Voice
- AI
created: '2026-07-11'
modified: '2026-09-16'
specificationVersion: '0.23'
apis:
- aid: unrealspeech:unrealspeech-speech-api
  name: Unreal Speech API
  description: Synchronous text-to-speech returning an MP3 and timestamp URLs.
  humanURL: https://docs.unrealspeech.com/reference/speech
  baseURL: https://api.v7.unrealspeech.com
  tags:
  - Speech
  properties:
  - type: OpenAPI
    url: openapi/unrealspeech-speech-api-openapi.yml
  - type: Documentation
    url: https://docs.unrealspeech.com/reference/getting-started-with-our-api
  - type: APIReference
    url: https://docs.unrealspeech.com/reference/speech
  - type: PostmanCollection
    url: collections/unrealspeech.postman_collection.json
  - type: OpenCollection
    url: collections/unrealspeech.opencollection.json
  - type: APIReference
    url: https://docs.unrealspeech.com/reference/stream
  - type: APIReference
    url: https://docs.unrealspeech.com/reference/synthesistasks
- aid: unrealspeech:unrealspeech-stream-api
  name: Unreal Speech Stream API
  description: Low-latency HTTP streaming synthesis returning audio bytes.
  humanURL: https://docs.unrealspeech.com/reference/speech
  baseURL: https://api.v7.unrealspeech.com
  tags:
  - Stream
  properties:
  - type: OpenAPI
    url: openapi/unrealspeech-stream-api-openapi.yml
  - type: Documentation
    url: https://docs.unrealspeech.com/reference/getting-started-with-our-api
  - type: APIReference
    url: https://docs.unrealspeech.com/reference/speech
  - type: PostmanCollection
    url: collections/unrealspeech.postman_collection.json
  - type: OpenCollection
    url: collections/unrealspeech.opencollection.json
  - type: APIReference
    url: https://docs.unrealspeech.com/reference/stream
  - type: APIReference
    url: https://docs.unrealspeech.com/reference/synthesistasks
- aid: unrealspeech:unrealspeech-synthesis-tasks-api
  name: Unreal Speech Synthesis Tasks API
  description: Asynchronous synthesis for long-form audio via submit-and-poll.
  humanURL: https://docs.unrealspeech.com/reference/speech
  baseURL: https://api.v7.unrealspeech.com
  tags:
  - Synthesis Tasks
  properties:
  - type: OpenAPI
    url: openapi/unrealspeech-synthesis-tasks-api-openapi.yml
  - type: Documentation
    url: https://docs.unrealspeech.com/reference/getting-started-with-our-api
  - type: APIReference
    url: https://docs.unrealspeech.com/reference/speech
  - type: PostmanCollection
    url: collections/unrealspeech.postman_collection.json
  - type: OpenCollection
    url: collections/unrealspeech.opencollection.json
  - type: APIReference
    url: https://docs.unrealspeech.com/reference/stream
  - type: APIReference
    url: https://docs.unrealspeech.com/reference/synthesistasks
common:
- type: Pricing
  url: https://unrealspeech.com/pricing
- type: AgenticAccess
  url: agentic-access/unrealspeech-agentic-access.yml
- type: DomainSecurity
  url: security/unrealspeech-domain-security.yml
- type: Authentication
  url: authentication/unrealspeech-authentication.yml
- type: GitHubOrganization
  url: https://github.com/unrealspeech
- type: LinkedIn
  url: https://www.linkedin.com/company/unrealspeech
- type: Website
  url: https://unrealspeech.com
- type: Documentation
  url: https://docs.unrealspeech.com
- type: Plans
  url: plans/unrealspeech-plans-pricing.yml
- type: RateLimits
  url: rate-limits/unrealspeech-rate-limits.yml
- type: FinOps
  url: finops/unrealspeech-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Unreal Speech API — frequently asked questions

Does Unreal Speech have an API?

Yes. APIs.io lists 3 APIs from Unreal Speech, including Unreal Speech API, Unreal Speech Stream API and Unreal Speech Synthesis Tasks API.

Is there an OpenAPI specification for the Unreal Speech API?

Yes. APIs.io indexes 3 OpenAPI specifications for Unreal Speech, each linked for download from this page.

How do I authenticate with the Unreal Speech API?

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

How much does the Unreal Speech API cost?

Unreal Speech publishes its prices; its Free plan is $0 as of 2026-10-07. APIs.io lists 6 pricing plans for Unreal Speech, with each plan's price, limits and inclusions under Pricing on this page.

Is the Unreal Speech API ready for AI agents?

Unreal Speech has a Kin Score of 35.3 out of 100 (thin) and an Agent Readiness score of 21.5 (agent-aware), scored by API Evangelist on 2026-11-13.

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