Circle — a bitcoin-based “social payment” app whose backers include Goldman Sachs — is mounting a British invasion.

Beginning Wednesday, users of Circle’s sleek mobile app will be able to make and receive cash payments in British pounds as well as US dollars.

It’s an initial overseas move that will soon be followed by a broader expansion to Europe and beyond, co-founder and Chief Executive Jeremy Allaire told The Post.

“When was the last time you sent an ‘international e-mail’?” Allaire said in an interview, arguing that payments worldwide ought to be just as seamless and hassle-free as e-mailing or texting.

To make that happen, Circle has spent heavily to clear hurdles with banking regulators in the US and abroad, and developed novel technologies to minimize default risk, thwart fraud and prevent money-laundering, Allaire said.

On top of Goldman Sachs, Circle has raised $76 million from Accel Partners and Silicon Valley tycoon Jim Breyer.

Still, Circle faces an increasingly crowded space in mobile payments, with competitors including PayPal’s Venmo app and Facebook’s new Messenger Payments.