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Tesla, the electric carmaker headed by billionaire Elon Musk, has started to allow people to buy brand merchandise using Dogecoin, a cryptocurrency initially started as a joke.

Mr Musk on Friday, a month after hinting of the plans.

The news sent the value of Dogecoin soaring, though it fell back later.

Comments by Mr Musk have frequently moved the prices of digital currencies, including Dogecoin and Bitcoin.

The move, which sent Dogecoin prices more than 14% higher at one point, comes a month after Mr Musk said Tesla would test out the digital token as a payment option.

Dogecoin, which was started in 2013 as a parody of the cryptocurrency craze, was once obscure.

But its value climbed about 4,000% last year, driven in part by promotion from Mr Musk.

An investor in the token, he has dubbed it the "people's crypto" and said his space company SpaceX would accept it as payment.

During an appearance on the humour show Saturday Night Live, after getting pressed to define it, he called it "a hustle".

It's not the only digital coin to receive attention from the billionaire, who has a passionate online following.

Last year, Bitcoin prices jumped after Tesla said it had invested in the currency and would allow customers to buy cars with it. But the company later scrapped that idea.

Mr Musk, who also counts Bitcoin among his crypto investments, cited concerns about how much energy it takes to produce the currency.

Dogecoin is currently the only digital currency Tesla accepts.

Items eligible for purchase include Tesla-branded belt buckles (835 Doge or about $162; £118) and children's all-terrain vehicles (12020 Doge or about $2,280; £1,670), which are currently sold out.

The purchases are non-refundable, according to the firm's website.