US President Donald Trump has signed a law to create a regulatory regime for US-dollar-pegged cryptocurrencies known as stablecoins, a milestone that could pave the way for the digital assets to become an everyday way to make payments and move money.

The bill, dubbed the Genius Act, passed by 308 to 122, receiving support from nearly half the Democratic members and most Republicans.

The law is a huge win for crypto supporters, who have long lobbied for such a regulatory framework in a bid to gain greater legitimacy for an industry that began in 2009 as a digital Wild West famed for its innovation and speculative chaos.

"This signing is a massive validation of your hard work and pioneering spirit," said Trump at a signing event that included several crypto executives.

Stablecoins are designed to maintain a constant value, usually a 1:1 U.S. dollar peg, and their use has exploded, notably by crypto traders moving funds between tokens. The industry hopes they will enter mainstream use for sending and receiving payments instantly.

The new law requires stablecoins to be backed by liquid assets - such as U.S. dollars and short-term Treasury bills - and for issuers to disclose publicly the composition of their reserves monthly.

Crypto companies and executives have argued such legislation will enhance stablecoins' credibility and make banks, retailers and consumers more willing to using them to transfer funds instantly.

The stablecoin market, which crypto data provider CoinGecko said is valued at more than US$260 billion, could grow to US$2 trillion by 2028 under the new law, Standard Chartered bank estimated earlier this year.

The law's passage culminates a long lobbying effort by the industry, which donated more than US$245 million in last year's elections to aid pro-crypto candidates including Trump, according to Federal Election Commission data. (Reuters)