Here are some options to watch boxing online:

1. DAZN: This is a subscription-based service that offers live boxing events, as well as replays and highlights. You can watch on your smart TVs and connected devices including Amazon Fire TV/Stick, Android TV, Apple TV, Chromecast, LG Smart TV, ROKU, Samsung Smart TV, and more.

2. ESPN+: This service offers near-weekly boxing matches as part of their exclusive contract with Top Rank boxing. These fights usually take place on ESPN networks, and you can watch them on your TV, phone, tablet, or computer.

3. Showtime: This is a premium cable network that offers live boxing events, as well as replays and highlights. You can watch Showtime boxing on your TV, phone, tablet, or computer. You can also watch Showtime boxing on Amazon Prime through the Showtime Channel.

4. FITE: This is a streaming service that offers live boxing events, as well as replays and highlights. You can watch FITE on your TV, phone, tablet, or computer. Many of the fights shown here are exclusive to the service.

5. Hulu + Live TV: This is a subscription-based service that offers live TV channels, including ESPN and Showtime, as well as on-demand content. You can watch on your TV, phone, tablet, or computer.

Note that some boxing matches are pay-per-view, which means you will need to pay a fee to watch them. Some of the above services may offer a discount on the PPV price for subscribers, but when you include subscription fees it ultimately costs the same.