Amazon Polly
Amazon Polly is a cloud service that converts text into lifelike speech, enabling you to create applications that talk and build entirely new categories of speech-enabled products. Polly supports multiple voices, languages, and audio output formats including neural and generative engines for natural-sounding speech.
Reference-quality API operations across every facet — a rich contract, published governance, transparent operations, and machine-readable commercial terms.
API Evangelist profiles Amazon Polly the way a machine reads it — 110 machine-readable artifacts across 5 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Amazon Polly scores 73.0/100 (exemplar), with a separate agent-readiness read of 55/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Amazon Polly
Each block below is one kind of artifact we hold for Amazon Polly. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 5
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Amazon Polly Lexicons API
The Lexicons API from Amazon Polly — 2 operation(s) for lexicons.
Amazon Polly Speech API
The Speech API from Amazon Polly — 1 operation(s) for speech.
Amazon Polly Speech Synthesis API
Operations for synthesizing speech from text
Amazon Polly SynthesisTasks API
The SynthesisTasks API from Amazon Polly — 2 operation(s) for synthesistasks.
Amazon Polly Voices API
The Voices API from Amazon Polly — 1 operation(s) for voices.
Postman Collections 2
A runnable collection turns the contract into something a developer can execute in seconds. We profile them because the fastest way to trust an API is to make a real call against it.
Ready-to-run Postman collections for exercising this provider's APIs.
Amazon Polly
POSTMANAmazon Polly API
POSTMANOpen Collections 1
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Amazon Polly API
OPEN COLLECTIONArazzo Workflows 9
Real integrations are rarely a single call. Arazzo describes the multi-step sequences — auth, then create, then confirm — so both a human and an agent can follow the choreography, not just the endpoints.
Multi-step API workflows described with the Arazzo specification.
Amazon Polly Store Lexicon, Start Async Task, and Poll
Store a lexicon, start an async synthesis task applying it, then poll to completion.
ARAZZOAmazon Polly List Synthesis Tasks and Inspect One
List synthesis tasks filtered by status, then fetch full detail on the first.
ARAZZOAmazon Polly Select Voice and Start Synthesis Task
Discover a voice for a language, then start an async synthesis task with it.
ARAZZOAmazon Polly List Voices and Synthesize Speech
Pick an available voice for a language and synthesize speech with it.
ARAZZOAmazon Polly Paginate the Voice Catalog
Page through the full DescribeVoices catalog using the NextToken cursor.
ARAZZOAmazon Polly Store Lexicon and Synthesize With It
Store a pronunciation lexicon, confirm it, then synthesize speech applying it.
ARAZZOAmazon Polly Replace Lexicon and Re-synthesize
Overwrite an existing lexicon, confirm the change, then re-synthesize speech with it.
ARAZZOAmazon Polly Start Synthesis Task and Poll to Completion
Start an async speech synthesis task, then poll it until it completes.
ARAZZOScroll within the panel for all 9 ·
Pricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Amazon Polly Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Amazon Polly Finops
FINOPSFeatures 8
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
Notable capabilities this provider offers.
Neural Text-to-Speech
Produce natural-sounding speech using neural network-based text-to-speech technology.
Generative Engine
New generative engine delivers the highest quality, most human-like speech synthesis.
Multiple Voices and Languages
Choose from 60+ voices across 30+ languages including male, female, and child voices.
SSML Support
Use Speech Synthesis Markup Language (SSML) to control pronunciation, volume, pitch, and speech rate.
Custom Lexicons
Create custom pronunciation lexicons to control how specific words and phrases are spoken.
Speech Marks
Generate speech marks metadata to synchronize spoken text with animations or visual highlights.
Asynchronous Synthesis Tasks
Process large text bodies asynchronously with S3 output for long-form content.
Multiple Audio Formats
Output audio in MP3, OGG, PCM, and JSON (speech marks) formats.
Scroll within the panel for all 8 ·
Semantic Vocabularies 1
JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.
JSON-LD contexts and semantic vocabularies used across these APIs.
Amazon Polly Context
JSON-LDSpectral Rules 2
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
Amazon Polly API Rules
SPECTRALAmazon Polly API Rules
SPECTRALJSON Schema 24
Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.
Standalone JSON Schema definitions for this provider's data models.
DescribeVoicesOutput
JSON SCHEMAEngine
JSON SCHEMAGender
JSON SCHEMAGetLexiconOutput
JSON SCHEMAGetSpeechSynthesisTaskOutput
JSON SCHEMALanguageCode
JSON SCHEMALexiconAttributes
JSON SCHEMALexiconDescription
JSON SCHEMALexicon
JSON SCHEMAListLexiconsOutput
JSON SCHEMAListSpeechSynthesisTasksOutput
JSON SCHEMAOutputFormat
JSON SCHEMAPutLexiconInput
JSON SCHEMAAmazon Polly Speech Synthesis Definition
JSON SCHEMASpeechMarkType
JSON SCHEMAStartSpeechSynthesisTaskInput
JSON SCHEMAStartSpeechSynthesisTaskOutput
JSON SCHEMASynthesisTask
JSON SCHEMASynthesizeSpeechInput
JSON SCHEMASynthesizeSpeechOutput
JSON SCHEMATaskStatus
JSON SCHEMATextType
JSON SCHEMAVoiceId
JSON SCHEMAVoice
JSON SCHEMAScroll within the panel for all 24 ·
JSON Structure 24
JSON Structure captures the data shapes in a form built for tooling — a complement to JSON Schema that keeps the model machine-legible.
JSON Structure definitions describing this provider's data shapes.
Amazon Polly Describe Voices Output Structure
JSON STRUCTUREAmazon Polly Engine Structure
JSON STRUCTUREAmazon Polly Gender Structure
JSON STRUCTUREAmazon Polly Get Lexicon Output Structure
JSON STRUCTUREAmazon Polly Get Speech Synthesis Task Output Structure
JSON STRUCTUREAmazon Polly Language Code Structure
JSON STRUCTUREAmazon Polly Lexicon Attributes Structure
JSON STRUCTUREAmazon Polly Lexicon Description Structure
JSON STRUCTUREAmazon Polly Lexicon Structure
JSON STRUCTUREAmazon Polly List Lexicons Output Structure
JSON STRUCTUREAmazon Polly Output Format Structure
JSON STRUCTUREAmazon Polly Put Lexicon Input Structure
JSON STRUCTUREAmazon Polly Speech Mark Type Structure
JSON STRUCTUREAmazon Polly Start Speech Synthesis Task Input Structure
JSON STRUCTUREAmazon Polly Structure
JSON STRUCTUREAmazon Polly Synthesis Task Structure
JSON STRUCTUREAmazon Polly Synthesize Speech Input Structure
JSON STRUCTUREAmazon Polly Synthesize Speech Output Structure
JSON STRUCTUREAmazon Polly Task Status Structure
JSON STRUCTUREAmazon Polly Text Type Structure
JSON STRUCTUREAmazon Polly Voice Id Structure
JSON STRUCTUREAmazon Polly Voice Structure
JSON STRUCTUREScroll within the panel for all 24 ·
Examples 16
Real request and response payloads are what turn a spec from abstract into obvious — and they're one of the twelve things an agent needs to call an API correctly on the first try.
Example request and response payloads for these APIs.
Scroll within the panel for all 16 ·
Security Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Use Cases 6
What developers actually build with this provider — captured so the catalogue answers 'what is this for', not just 'what does this expose'.
What developers build with this provider.
Voice Assistants
Build conversational interfaces that speak responses to users.
Accessibility Features
Add text-to-speech reading to applications for visually impaired users.
Podcast and Audio Content
Convert written articles and content into audio podcasts automatically.
E-Learning Narration
Add spoken narration to educational courses and training materials.
Call Center IVR
Create interactive voice response systems with natural-sounding speech.
Language Learning Apps
Provide native-speaker pronunciation examples for language education.
Integrations 5
Pre-built integrations with other platforms tell you where this provider already fits in a stack.
Pre-built integrations with other platforms and tools.
Amazon S3
Store synthesized speech output from asynchronous synthesis tasks in S3 buckets.
Amazon Lex
Combine Polly speech synthesis with Lex conversational AI for voice chatbots.
AWS Lambda
Trigger speech synthesis from Lambda functions for event-driven voice applications.
Amazon Transcribe
Pair Polly text-to-speech with Transcribe speech-to-text for round-trip voice applications.
Amazon Connect
Power Amazon Connect contact center voice responses with Polly neural speech.
Resources
Every other property we hold for Amazon Polly — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 3
Portal, sign-up, and the first successful call
Documentation 25
Reference material describing how the API behaves
Scroll within the panel for all 25 ·
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 36
Pagination, idempotency, versioning, errors, and events
Scroll within the panel for all 36 ·
Build 21
SDKs, sample code, and the tooling you integrate with
Scroll within the panel for all 21 ·
Access & Security 4
Authentication, authorization, and security posture
Operate 4
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 1
The organization behind the API
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