# Yo API (justyo.co)

> Yo is "the world's simplest API" — a single-tap push notification service. A
> registered API username receives an api_token that authorizes sending a Yo to one
> subscriber or all subscribers, optionally with a link, plus reading the subscriber
> count. The Yo service is now defunct; this profile is an API Evangelist historical capture.

## APIs
- [Yo API](https://docs.justyo.co/): Send Yo notifications to subscribers. Base URL https://api.justyo.co.

## Specs
- [OpenAPI](openapi/justyo-yo-openapi.yml): sendYo, sendYoAll, getSubscribersCount.

## Operations
- sendYo — POST /yo/ (api_token, username, link?) — Yo one subscriber.
- sendYoAll — POST /yoall/ (api_token, link?) — Yo all subscribers.
- getSubscribersCount — GET /subscribers_count/ (api_token) — subscriber count.

## Auth
- api_token issued via the Yo Developer Hub; form field on POST, query param on GET.

## Docs
- [Documentation](https://docs.justyo.co/)
- [Developer Hub](http://dev.justyo.co/)
- [GitHub org](https://github.com/YoApp)

## SDKs
- Python (YoPy), PHP (yo-php), Java (YoJava), Node (node-yo-api), Ruby (hey),
  Scala (Scala-Yo), iOS/Objective-C (YO-iOS-SDK) — all under github.com/YoApp.