Monster Products Inc. is planning what could be the largest initial coin offering ever, hoping to raise up to $300 million in an ambitious bid to build a global payment system and revitalize the company’s sagging fortunes.

In a filing with the Securities and Exchange Commission last week, the maker of consumer-electronics cables, surge protectors and headphones said it intends to offer 300 million “Monster Money Tokens” at $1 each to raise funds to build a new e-commerice platform — the “Monster Money Network,” based on Ethereum ETHUSD, +0.96% blockchain technology. The company said consumers would be able to buy its products and services — and potentially partners’ products as well — using either Monster tokens or fiat currencies.