Amazon Lex

Amazon Lex is a fully managed artificial intelligence (AI) service with advanced natural language models to design, build, test, and deploy conversational interfaces in applications. It provides the deep learning functionalities of automatic speech recognition (ASR) for converting speech to text, and natural language understanding (NLU) to recognize the intent of the text, enabling you to build applications with highly engaging user experiences and lifelike conversational interactions.

Amazon Lex publishes 2 APIs on the APIs.io network: Bots API and Runtime V2 API. Tagged areas include Artificial Intelligence, Conversational AI, Chatbots, Natural Language Processing, and Speech.

The Amazon Lex catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

Amazon Lex’s developer surface includes authentication, developer portal, documentation, support, engineering blog, developer console, signup flow, and 44 more developer resources.

🌐 Visit website 📡 Source on GitHub

77.6/100 exemplar ▬ flat Agent 34/100 agent ready saas Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0

AccessFreemiumSelf serve⚡ Free to try

2 APIs 1 MCP Servers 6 Features 4 Use Cases

Artificial Intelligence Conversational AI Chatbots Natural Language Processing Speech Voice Contact Center Customer Service

Kin Score

Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0

Composite quality — 77.6/100 · exemplar

Contract Quality 13.4 / 19

Developer Ergonomics 12.2 / 15

Access Clarity 12.4 / 15

Operational Transparency 8.2 / 10

Contract Governance 4.1 / 9

Discoverability 5.6 / 8

Regulatory Posture 4.9 / 15

Create-or-Update Ergonomics 1.1 / 10

Agent readiness — 34/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 12 / 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 5 / 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/amazon-lex: 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 2

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

Amazon Lex Bots API

Lex bot management

Amazon Lex Runtime V2 API

Send user input to a built Amazon Lex V2 bot and manage the conversation session. Six operations: RecognizeText (text turn), RecognizeUtterance (audio or text turn), StartConver...

Postman Collections 1

Ready-to-run Postman collections for exercising this provider's APIs.

Amazon Lex Bots API

POSTMAN

Open Collections 4

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

API Collection

OPEN COLLECTION

Amazon Lex Bots API

OPEN COLLECTION

Amazon Lex API

OPEN COLLECTION

Amazon Lex API

OPEN COLLECTION

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Amazon Lex MCP Server

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Amazon Lex Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Amazon Lex Rate Limits

24 limits

RATE LIMITS

FinOps 1

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

Amazon Lex Finops

FINOPS

Features 6

Notable capabilities this provider offers.

Automatic Speech Recognition

Convert speech to text with high accuracy using the same deep learning technology as Amazon Alexa.

Natural Language Understanding

Understand the intent behind user input to build conversational interfaces.

Multi-Channel Deployment

Deploy bots across web, mobile, messaging channels (Slack, Facebook Messenger, Twilio), and contact centers.

Amazon Connect Integration

Build intelligent contact center bots with native integration with Amazon Connect.

Streaming Conversations

Support multi-turn streaming conversations for complex dialog flows.

Intent Recognition

Recognize user intents and extract slot values from natural language input.

Semantic Vocabularies 1

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

Amazon Lex Context

2 classes · 7 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

Amazon Lex API Rules

4 rules · 2 warnings 2 info

SPECTRAL

Amazon Lex API Rules

24 rules · 9 errors 14 warnings 1 info

SPECTRAL

JSON Schema 2

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

Bot

7 properties

JSON SCHEMA

Intent

7 properties

JSON SCHEMA

JSON Structure 2

JSON Structure definitions describing this provider's data shapes.

Amazon Lex Bot Structure

7 properties

JSON STRUCTURE

Amazon Lex Intent Structure

7 properties

JSON STRUCTURE

Examples 2

Example request and response payloads for these APIs.

Amazon Lex Bot Example

7 fields

EXAMPLE

Amazon Lex Intent Example

7 fields

EXAMPLE

Security Posture 4

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

Amazon Lex Authentication

sigv4 · 1 scheme

SECURITY

Amazon Lex Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Amazon Lex Vulnerability Disclosure

security.txt · contact published

SECURITY

Amazon Lex Trust Center

PCI DSS, HIPAA, FedRAMP, GDPR, FIPS 140

SECURITY

Agentic Access 1

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

Amazon Lex Agentic Access

113 operations · 63 acting · 2 human-in-the-loop

113 operations · 63 acting

AGENTIC

Use Cases 4

What developers build with this provider.

Customer Service Chatbot

Build self-service chatbots for customer support and FAQ handling.

Contact Center Automation

Automate contact center interactions with intelligent IVR and agent assist.

Internal Help Desk

Create employee-facing bots for IT help desk and HR self-service.

E-Commerce Assistant

Build shopping assistants that understand natural language product queries.

Integrations 4

Pre-built integrations with other platforms and tools.

Amazon Connect

Deploy Lex bots in Amazon Connect contact flows for IVR and agent assist.

Amazon Kendra

Combine Lex for dialog management with Kendra for intelligent document search.

AWS Lambda

Use Lambda for fulfillment logic and business rules in bot conversations.

Amazon Polly

Convert bot text responses to natural speech using Amazon Polly TTS.

Resources

Get Started 7

Portal, sign-up, and the first successful call

Portal

Portal

Console

Console

Signup

Signup

Login

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Sandbox

Sandbox

Scroll for all 7

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

WellKnown

MCPServer

LLMsTxt

AgentSkill

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

SpectralRules

Vocabulary

Conformance

ErrorCatalog

Lifecycle

Conventions

DataModel

Scroll for all 7

Build 7

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

GitHubOrganization

Packages

SDKs

CLI

ToolCrosswalk

Examples

Scroll for all 7

Access & Security 7

Authentication, authorization, and security posture

TrustCenter

TrustCenter

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

Authentication

Security

Compliance

SecurityTxt

Scroll for all 7

Learn 1

Tutorials, courses, talks, and written guidance

YouTube

YouTube

Operate 7

Status, limits, changes, and where to get help

Support

StatusPage

StackOverflow

Contact

Deprecation

ChangeLog

RateLimits

Scroll for all 7

Commercial 4

Pricing, plans, and the legal terms of use

TermsOfService

PrivacyPolicy

Pricing

Plans

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

knowledge-center

knowledge-center

Smithy

Smithy

Source (apis.yml)

name: Amazon Lex
description: Amazon Lex is a fully managed artificial intelligence (AI) service with advanced natural language models to design,
  build, test, and deploy conversational interfaces in applications. It provides the deep learning functionalities of automatic
  speech recognition (ASR) for converting speech to text, and natural language understanding (NLU) to recognize the intent
  of the text, enabling you to build applications with highly engaging user experiences and lifelike conversational interactions.
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
specificationVersion: '0.23'
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://a0.awsstatic.com/libra-css/images/logos/aws_logo_smile_1200x630.png
url: https://apis.io/amazon-lex
tags:
- Artificial Intelligence
- Conversational AI
- Chatbots
- Natural Language Processing
- Speech
- Voice
- Contact Center
- Customer Service
- AWS
created: '2024-01-15'
modified: '2026-09-17'
apis:
- aid: amazon-lex:amazon-lex-bots-api
  name: Amazon Lex Bots API
  description: Lex bot management
  baseURL: https://models-v2-lex.us-east-1.amazonaws.com
  humanURL: https://docs.aws.amazon.com/lexv2/latest/APIReference/Welcome.html
  image: https://a0.awsstatic.com/libra-css/images/logos/aws_logo_smile_1200x630.png
  tags:
  - Bots
  properties:
  - type: OpenAPI
    name: OpenAPI (derived from the AWS Smithy service model, 107 operations)
    url: openapi/amazon-lex-models-v2-openapi.yml
  - type: Smithy
    name: AWS Amazon Lex Model Building V2 Smithy 2.0 model (107 operations)
    url: smithy/amazon-lex-models-v2-2020-08-07.json
  - type: Documentation
    url: https://docs.aws.amazon.com/lexv2/latest/dg/what-is.html
  - type: JSONSchema
    url: json-schema/json-schema.yml
  - type: JSONLD
    url: json-ld/json-ld.yml
  - type: Pricing
    url: https://aws.amazon.com/lex/pricing/
  - type: GettingStarted
    url: https://aws.amazon.com/lex/getting-started/
  - type: FAQ
    url: https://aws.amazon.com/lex/faqs/
  - type: APIReference
    url: https://docs.aws.amazon.com/lexv2/latest/APIReference/Welcome.html
  - type: Overlay
    url: overlays/amazon-lex-models-v2-overlay.yaml
  - type: DataModel
    url: data-model/amazon-lex-data-model.yml
  - type: JSONSchema
    url: json-schema/amazon-lex-bot-schema.json
  - type: JSONSchema
    url: json-schema/amazon-lex-intent-schema.json
  - type: JSONLD
    url: json-ld/amazon-lex-context.jsonld
- aid: amazon-lex:amazon-lex-runtime-v2-api
  name: Amazon Lex Runtime V2 API
  description: 'Send user input to a built Amazon Lex V2 bot and manage the conversation session. Six operations: RecognizeText
    (text turn), RecognizeUtterance (audio or text turn), StartConversation (bidirectional HTTP/2 streaming with barge-in),
    and PutSession / GetSession / DeleteSession for session state.'
  baseURL: https://runtime-v2-lex.us-east-1.amazonaws.com
  humanURL: https://docs.aws.amazon.com/lexv2/latest/APIReference/API_Operations_Amazon_Lex_Runtime_V2.html
  image: https://a0.awsstatic.com/libra-css/images/logos/aws_logo_smile_1200x630.png
  tags:
  - Conversational AI
  - Runtime
  - Speech Recognition
  - Sessions
  properties:
  - type: OpenAPI
    name: OpenAPI (derived from the AWS Smithy service model, 6 operations)
    url: openapi/amazon-lex-runtime-v2-openapi.yml
  - type: Smithy
    name: AWS Amazon Lex Runtime V2 Smithy 2.0 model
    url: smithy/amazon-lex-runtime-v2-2020-08-07.json
  - type: Overlay
    url: overlays/amazon-lex-runtime-v2-overlay.yaml
  - type: Documentation
    url: https://docs.aws.amazon.com/lexv2/latest/dg/how-it-works.html
  - type: APIReference
    url: https://docs.aws.amazon.com/lexv2/latest/APIReference/API_Operations_Amazon_Lex_Runtime_V2.html
  - type: Pricing
    url: https://aws.amazon.com/lex/pricing/
common:
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/amazon-lex/overview
- type: AgenticAccess
  url: agentic-access/amazon-lex-agentic-access.yml
- type: TrustCenter
  url: security/amazon-lex-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/amazon-lex-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/amazon-lex-domain-security.yml
- type: Authentication
  url: authentication/amazon-lex-authentication.yml
- type: Portal
  url: https://aws.amazon.com/
- type: Website
  url: https://aws.amazon.com/lex/
- type: Documentation
  url: https://docs.aws.amazon.com/lex/
- type: TermsOfService
  url: https://aws.amazon.com/service-terms/
- type: PrivacyPolicy
  url: https://aws.amazon.com/privacy/
- type: Support
  url: https://aws.amazon.com/premiumsupport/
- type: Blog
  url: https://aws.amazon.com/blogs/machine-learning/
- type: GitHubOrganization
  url: https://github.com/aws
- type: Console
  url: https://console.aws.amazon.com/lexv2/home
- type: Signup
  url: https://portal.aws.amazon.com/billing/signup
- type: Login
  url: https://signin.aws.amazon.com/
- type: StatusPage
  url: https://health.aws.amazon.com/health/status
- type: knowledge-center
  url: https://repost.aws/knowledge-center
- type: YouTube
  url: https://www.youtube.com/user/AmazonWebServices
- type: StackOverflow
  url: https://stackoverflow.com/questions/tagged/amazon-lex
- type: Contact
  url: https://aws.amazon.com/contact-us/
- type: Security
  url: https://aws.amazon.com/security/
- type: Compliance
  url: https://aws.amazon.com/compliance/
- type: Features
  data:
  - name: Automatic Speech Recognition
    description: Convert speech to text with high accuracy using the same deep learning technology as Amazon Alexa.
  - name: Natural Language Understanding
    description: Understand the intent behind user input to build conversational interfaces.
  - name: Multi-Channel Deployment
    description: Deploy bots across web, mobile, messaging channels (Slack, Facebook Messenger, Twilio), and contact centers.
  - name: Amazon Connect Integration
    description: Build intelligent contact center bots with native integration with Amazon Connect.
  - name: Streaming Conversations
    description: Support multi-turn streaming conversations for complex dialog flows.
  - name: Intent Recognition
    description: Recognize user intents and extract slot values from natural language input.
- type: UseCases
  data:
  - name: Customer Service Chatbot
    description: Build self-service chatbots for customer support and FAQ handling.
  - name: Contact Center Automation
    description: Automate contact center interactions with intelligent IVR and agent assist.
  - name: Internal Help Desk
    description: Create employee-facing bots for IT help desk and HR self-service.
  - name: E-Commerce Assistant
    description: Build shopping assistants that understand natural language product queries.
- type: Integrations
  data:
  - name: Amazon Connect
    description: Deploy Lex bots in Amazon Connect contact flows for IVR and agent assist.
  - name: Amazon Kendra
    description: Combine Lex for dialog management with Kendra for intelligent document search.
  - name: AWS Lambda
    description: Use Lambda for fulfillment logic and business rules in bot conversations.
  - name: Amazon Polly
    description: Convert bot text responses to natural speech using Amazon Polly TTS.
- type: SpectralRules
  url: rules/amazon-lex-spectral-rules.yml
- type: Vocabulary
  url: vocabulary/amazon-lex-vocabulary.yaml
- type: DeveloperPortal
  url: https://aws.amazon.com/lex/
- type: APIReference
  url: https://docs.aws.amazon.com/lexv2/latest/APIReference/Welcome.html
- type: GettingStarted
  url: https://docs.aws.amazon.com/lexv2/latest/dg/getting-started.html
- type: Pricing
  url: https://aws.amazon.com/lex/pricing/
- type: Smithy
  name: AWS-published Smithy 2.0 service models (Model Building V2 + Runtime V2)
  url: smithy/amazon-lex-models-v2-2020-08-07.json
- type: Packages
  url: packages/amazon-lex-packages.yml
- type: SDKs
  url: packages/amazon-lex-packages.yml
- type: CLI
  url: cli/amazon-lex-cli.yml
- type: WellKnown
  url: well-known/amazon-lex-well-known.yml
- type: SecurityTxt
  url: well-known/amazon-lex-security.txt
- type: MCPServer
  url: mcp/amazon-lex-mcp.yml
- type: ToolCrosswalk
  url: mcp/amazon-lex-tool-crosswalk.yml
- type: LLMsTxt
  url: llms/amazon-lex-llms.txt
- type: AgentSkill
  url: skills/_index.yml
- type: Conformance
  url: conformance/amazon-lex-conformance.yml
- type: ErrorCatalog
  url: errors/amazon-lex-problem-types.yml
- type: Lifecycle
  url: lifecycle/amazon-lex-lifecycle.yml
- type: Deprecation
  url: https://docs.aws.amazon.com/lexv2/latest/dg/migration.html
- type: Conventions
  url: conventions/amazon-lex-conventions.yml
- type: ChangeLog
  url: changelog/amazon-lex-changelog.yml
- type: Sandbox
  url: sandbox/amazon-lex-sandbox.yml
- type: DataModel
  url: data-model/amazon-lex-data-model.yml
- type: Plans
  url: plans/amazon-lex-plans-pricing.yml
- type: RateLimits
  url: rate-limits/amazon-lex-rate-limits.yml
- type: Examples
  url: examples/amazon-lex-bot-example.json
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-parent: amazon-web-services
x-relationship: product
x-enrichment:
  date: '2026-09-17'
  status: enriched
  artifacts_added: 26
  pass: local-v3

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