# LISNR

**Canonical:** https://apis.io/providers/lisnr/  
**Website:** https://lisnr.com/  
**APIs profiled:** 2

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.

## Kin Score — 19.8 / 100 (emerging)

Scored 2026-08-30 under rubric 0.17.2. Trend: flat (-0.6 from 20.4).

| Facet | Score |
|---|---|
| Discoverability | 75.9 |
| Contract Quality | 15.1 |
| Governance | 4.5 |
| Contract Governance | 4.5 |
| Operational Transparency | 2.6 |
| Developer Ergonomics | 42.3 |
| Commercial Clarity | 0.0 |
| Access Clarity | 0.0 |

Regulatory layer — **Payments**: 26.6 (matched via tags).

## Agent readiness — 25.0 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | bearer |
| Idempotency | no |
| Error Semantics | verified |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | derived |
| Well Known Catalog | yes |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Access

Self-serve signup — onboarding: self-serve, pricing: unknown, trial: no (confidence: medium).

## APIs (10)

- **LISNR Accounts API** — The Accounts API from LISNR — 1 operation(s) for accounts.
- **LISNR API Tokens API** — The API Tokens API from LISNR — 2 operation(s) for api tokens.
- **LISNR Applications API** — The Applications API from LISNR — 2 operation(s) for applications.
- **LISNR Authentication API** — The Authentication API from LISNR — 5 operation(s) for authentication.
- **LISNR Billing API** — The Billing API from LISNR — 1 operation(s) for billing.
- **LISNR Notifications API** — The Notifications API from LISNR — 2 operation(s) for notifications.
- **LISNR SDK Releases API** — The SDK Releases API from LISNR — 1 operation(s) for sdk releases.
- **LISNR SDK Tokens API** — The SDK Tokens API from LISNR — 2 operation(s) for sdk tokens.
- **LISNR Tones Service API Reference API** — The Tones Service API Reference API from LISNR — 1 operation(s) for tones service api reference.
- **LISNR Users API** — The Users API from LISNR — 3 operation(s) for users.

## MCP servers (1)

- **LISNR MCP Server**

## Security (2)

- **Lisnr Authentication** — apiKey · 1 scheme
- **Lisnr Domain Security** — TLSv1.3 · DMARC

## Tags

Company, Ultrasonic, Data Over Audio, Proximity, Contactless Payments, Device Pairing, Identification, Audio, Internet of Things, SDK

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/lisnr/). Scores are computed from the provider's own public artifacts under a published rubric.