San Salvador — Tether, the crypto company behind the largest stablecoin, is introducing its $140 billion USDT token to Bitcoin — the blockchain that underpins the largest and oldest cryptocurrency — and Bitcoin-based scaling service Lightning Network, the company posted on X on Thursday.

Stablecoins are a $200 billion digital asset class with their prices anchored to an external asset, predominantly the U.S. dollar. They serve as a bridge between government-issued money and blockchain-based digital assets, and are increasingly popular for everyday uses like payments, savings and remittances, especially in emerging countries.

While stablecoin usage has rapidly rapidly expanded over the past years, activity and supply are mostly concentrated on smart contract platforms like Ethereum, Tron and Solana.

What makes USDT’s integration with Bitcoin possible is Taproot Assets, a piece of infrastructure that allows asset issuances on the Bitcoin base layer and transfers over the Lightning Network, a scaling platform focusing on fast and cheap transactions, thus making micropayments more cost-efficient. The protocol, developed by Lightning Labs and released last year, opens the way to bring external tokens like stablecoins to the Bitcoin ecosystem.