LISNR

LISNR is a Cincinnati, Ohio company whose ultrasonic data-over-audio technology transmits data between devices using inaudible high-frequency tones instead of radio. Its Radius SDKs (Radius, Radius 3, Point, and the legacy and SDA product lines) embed a transmitter/receiver into iOS, Android, React Native, Linux and Windows applications so that a speaker and a microphone become a proximity data channel for contactless payment, identification, confirmation and device-pairing transactions. Developers work through the LISNR Portal, which issues per-application API tokens and SDK tokens, exposes SDK releases and sample projects, and provides a Tone Creator and a tone-speed calculator. The public Tones Service API generates a downloadable 24-bit audio tone (WAV or MP3) from a hexadecimal payload for a chosen tone profile, with optional AES-256 payload encryption and ToneLock pairing so that only matching receivers can demodulate the tone.

LISNR publishes 10 APIs on the APIs.io network, including Accounts API, API Tokens API, Applications API, and 7 more. Tagged areas include Company, Ultrasonic, Data Over Audio, Proximity, and Contactless Payments.

LISNR’s developer surface includes documentation, API reference, getting-started guide, support, signup flow, authentication, and 16 more developer resources.

🌐 Visit website 📡 Source on GitHub

41.3/100 thin ▬ flat Agent 40/100 agent ready Full breakdown ↓
scored 2026-08-10 · rubric v0.9.1

AccessSelf serve

10 APIs 1 MCP Servers

CompanyUltrasonicData Over AudioProximityContactless PaymentsDevice PairingIdentificationAudioInternet of ThingsSDK

Kin Score

Kin Score How this is scored →
scored 2026-08-10 · rubric v0.9.1

Composite quality — 41.3/100 · thin

Contract Quality 15.2 / 25

Developer Ergonomics 12.1 / 20

Commercial Clarity 2.6 / 20

Operational Transparency 0.7 / 13

Governance 1.4 / 12

Discoverability 9.3 / 10

Agent readiness — 40/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/lisnr: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 10

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

MCP Servers 1

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

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

WellKnown

MCPServer

LLMsTxt

AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

Conformance

DataModel

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

SDKs

SDKs

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

Support

Support

HelpCenter

HelpCenter

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: lisnr
name: LISNR
description: LISNR is a Cincinnati, Ohio company whose ultrasonic data-over-audio technology transmits data between devices
  using inaudible high-frequency tones instead of radio. Its Radius SDKs (Radius, Radius 3, Point, and the legacy and SDA
  product lines) embed a transmitter/receiver into iOS, Android, React Native, Linux and Windows applications so that a speaker
  and a microphone become a proximity data channel for contactless payment, identification, confirmation and device-pairing
  transactions. Developers work through the LISNR Portal, which issues per-application API tokens and SDK tokens, exposes
  SDK releases and sample projects, and provides a Tone Creator and a tone-speed calculator. The public Tones Service API
  generates a downloadable 24-bit audio tone (WAV or MP3) from a hexadecimal payload for a chosen tone profile, with optional
  AES-256 payload encryption and ToneLock pairing so that only matching receivers can demodulate the tone.
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://lh3.googleusercontent.com/v89HEtbE-zGOkBwCmWf7zbG9BBtS22tgXzNSgZG4F3fqv90KqLo0yWO5D1PFUxGG-VSIVNgoxsWEVLLjA-pkHA=w205
url: https://raw.githubusercontent.com/api-evangelist/lisnr/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- techstars
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Ultrasonic
- Data Over Audio
- Proximity
- Contactless Payments
- Device Pairing
- Identification
- Audio
- Internet of Things
- SDK
apis:
- aid: lisnr:lisnr-accounts-api
  name: LISNR Accounts API
  description: The Accounts API from LISNR — 1 operation(s) for accounts.
  humanURL: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  baseURL: https://tones.lisnr.com/
  tags:
  - Accounts
  properties:
  - type: OpenAPI
    url: openapi/lisnr-accounts-api-openapi.yml
  - type: Documentation
    url: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  - type: APIReference
    url: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  - type: Documentation
    url: https://portal.lisnr.com/developer-resources/api
- aid: lisnr:lisnr-api-tokens-api
  name: LISNR API Tokens API
  description: The API Tokens API from LISNR — 2 operation(s) for api tokens.
  humanURL: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  baseURL: https://tones.lisnr.com/
  tags:
  - API Tokens
  properties:
  - type: OpenAPI
    url: openapi/lisnr-api-tokens-api-openapi.yml
  - type: Documentation
    url: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  - type: APIReference
    url: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  - type: Documentation
    url: https://portal.lisnr.com/developer-resources/api
- aid: lisnr:lisnr-applications-api
  name: LISNR Applications API
  description: The Applications API from LISNR — 2 operation(s) for applications.
  humanURL: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  baseURL: https://tones.lisnr.com/
  tags:
  - Applications
  properties:
  - type: OpenAPI
    url: openapi/lisnr-applications-api-openapi.yml
  - type: Documentation
    url: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  - type: APIReference
    url: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  - type: Documentation
    url: https://portal.lisnr.com/developer-resources/api
- aid: lisnr:lisnr-authentication-api
  name: LISNR Authentication API
  description: The Authentication API from LISNR — 5 operation(s) for authentication.
  humanURL: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  baseURL: https://tones.lisnr.com/
  tags:
  - Authentication
  properties:
  - type: OpenAPI
    url: openapi/lisnr-authentication-api-openapi.yml
  - type: Documentation
    url: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  - type: APIReference
    url: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  - type: Documentation
    url: https://portal.lisnr.com/developer-resources/api
- aid: lisnr:lisnr-billing-api
  name: LISNR Billing API
  description: The Billing API from LISNR — 1 operation(s) for billing.
  humanURL: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  baseURL: https://tones.lisnr.com/
  tags:
  - Billing
  properties:
  - type: OpenAPI
    url: openapi/lisnr-billing-api-openapi.yml
  - type: Documentation
    url: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  - type: APIReference
    url: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  - type: Documentation
    url: https://portal.lisnr.com/developer-resources/api
- aid: lisnr:lisnr-notifications-api
  name: LISNR Notifications API
  description: The Notifications API from LISNR — 2 operation(s) for notifications.
  humanURL: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  baseURL: https://tones.lisnr.com/
  tags:
  - Notifications
  properties:
  - type: OpenAPI
    url: openapi/lisnr-notifications-api-openapi.yml
  - type: Documentation
    url: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  - type: APIReference
    url: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  - type: Documentation
    url: https://portal.lisnr.com/developer-resources/api
- aid: lisnr:lisnr-sdk-releases-api
  name: LISNR SDK Releases API
  description: The SDK Releases API from LISNR — 1 operation(s) for sdk releases.
  humanURL: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  baseURL: https://tones.lisnr.com/
  tags:
  - SDK Releases
  properties:
  - type: OpenAPI
    url: openapi/lisnr-sdk-releases-api-openapi.yml
  - type: Documentation
    url: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  - type: APIReference
    url: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  - type: Documentation
    url: https://portal.lisnr.com/developer-resources/api
- aid: lisnr:lisnr-sdk-tokens-api
  name: LISNR SDK Tokens API
  description: The SDK Tokens API from LISNR — 2 operation(s) for sdk tokens.
  humanURL: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  baseURL: https://tones.lisnr.com/
  tags:
  - SDK Tokens
  properties:
  - type: OpenAPI
    url: openapi/lisnr-sdk-tokens-api-openapi.yml
  - type: Documentation
    url: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  - type: APIReference
    url: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  - type: Documentation
    url: https://portal.lisnr.com/developer-resources/api
- aid: lisnr:lisnr-tones-service-api-reference-api
  name: LISNR Tones Service API Reference API
  description: The Tones Service API Reference API from LISNR — 1 operation(s) for tones service api reference.
  humanURL: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  baseURL: https://tones.lisnr.com/
  tags:
  - Tones Service API Reference
  properties:
  - type: OpenAPI
    url: openapi/lisnr-tones-service-api-reference-api-openapi.yml
  - type: Documentation
    url: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  - type: APIReference
    url: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  - type: Documentation
    url: https://portal.lisnr.com/developer-resources/api
- aid: lisnr:lisnr-users-api
  name: LISNR Users API
  description: The Users API from LISNR — 3 operation(s) for users.
  humanURL: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  baseURL: https://tones.lisnr.com/
  tags:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/lisnr-users-api-openapi.yml
  - type: Documentation
    url: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  - type: APIReference
    url: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
  - type: Documentation
    url: https://portal.lisnr.com/developer-resources/api
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://lisnr.com/
- type: DeveloperPortal
  url: https://portal.lisnr.com/
- type: Documentation
  url: https://portal.lisnr.com/developer-resources/
- type: APIReference
  url: https://portal.lisnr.com/assets/tones-docs/tones-docs.html
- type: GettingStarted
  url: https://portal.lisnr.com/help-center/getting-started/
- type: Support
  url: https://lisnr1.atlassian.net/servicedesk/customer/portals
- type: HelpCenter
  url: https://portal.lisnr.com/help-center/
- type: GitHubOrganization
  url: https://github.com/lisnr
- type: SignUp
  url: https://portal.lisnr.com/
- type: Authentication
  url: authentication/lisnr-authentication.yml
- type: Conventions
  url: conventions/lisnr-conventions.yml
- type: ErrorCatalog
  url: errors/lisnr-problem-types.yml
- type: Lifecycle
  url: lifecycle/lisnr-lifecycle.yml
- type: Conformance
  url: conformance/lisnr-conformance.yml
- type: Packages
  url: packages/lisnr-packages.yml
- type: SDKs
  url: packages/lisnr-packages.yml
- type: WellKnown
  url: well-known/lisnr-well-known.yml
- type: MCPServer
  url: mcp/lisnr-mcp.yml
- type: LLMsTxt
  url: llms/lisnr-llms.txt
- type: DataModel
  url: data-model/lisnr-data-model.yml
- type: DomainSecurity
  url: security/lisnr-domain-security.yml
- type: AgentSkill
  url: skills/_index.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

LISNR

Kin Score

APIs 10

LISNR Accounts API

LISNR API Tokens API

LISNR Applications API

LISNR Authentication API

LISNR Billing API

LISNR Notifications API

LISNR SDK Releases API

LISNR SDK Tokens API

LISNR Tones Service API Reference API

LISNR Users API

MCP Servers 1

lisnr-mcp.yml

Security Posture 2

Lisnr Authentication

Lisnr Domain Security

Resources