“At first, I was sceptical because I thought it was a Ponzi scam,” said Lumabi, 26, who began playing last June after losing his job at an advertising firm and making a failed foray into online selling.

About 35 per cent of Axie Infinity traffic – and the biggest share of its 2.5 million daily active users – comes from the Philippines, where high proficiency in English, strong gaming culture and widespread smartphone usage have fuelled its popularity, Sky Mavis said.

In Axie Infinity, players participate in battles using colourful blob-like Axies, and are mainly rewarded “Smooth Love Potion” (SLPs) that can be exchanged for cryptocurrency or cash – or invested back into the game’s virtual world Lunacia.

Lumabi plays for two hours a day in the tiny house he shares with his parents and four sisters, earning 8,000-10,000 pesos (US$155-195) per month – nearly half of what he makes at his current job as a content moderator working nine-hour graveyard shifts.

He has used Axie Infinity earnings for his sister’s university fees, groceries and bills – expenses his father’s struggling electrical repair business cannot cover.

The pandemic was the perfect environment for this game to attract players from all walks of life, said Leah Callon-Butler, a blockchain consultant based in the Philippines. “They could sit at home, protected from the virus, and play a cute game and earn money from it.”

But there is a catch.

To play the game, players first have to purchase at least three Axies.

An Axie is an NFT – a unique, non-fungible token, with a particular set of abilities and characteristics. Like NFT pieces of art, they are stored on the blockchain – a digital ledger that cannot be changed.

Axies can be bought, sold or rented to other players. Owners can also breed them to create new Axies that provide more value.

At the peak of the game’s growth last year, a starter team of Axies could cost hundreds of dollars, far beyond the reach of aspiring players in poorer countries.

When AFP accessed the game’s marketplace on February 9, the cheapest Axies cost US$37 each, putting the cost of a basic team at US$111.

However, players who spend more get better Axies, giving them a better chance of winning battles to earn SLPs and – from some activities – the game’s other crypto token AXS.

Those with the capital to assemble more lucrative Axie teams have set up guilds and “scholarships” – profit-sharing systems where players are charged a percentage of their earnings.

The owners’ take can reportedly go as high as 30 per cent.

“We provide the players with the assets that they need to generate income for themselves,” said Luis Buenaventura, who runs Yield Guild Games in the Philippines, one of the many companies offering scholarships. “In exchange for that, we ask for 10 per cent of their earnings.”

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YGG alone has 8,000 scholars and a queue of around 60,000 people waiting to join its programme that offers training and mentoring to a limited number of players at a time.

Buenaventura said many of his players were in their early 20s and from households making less than US$400 a month.

He described their monthly Axie winnings – around US$200 – as “life-changing”.

As the number of daily active players skyrocketed in 2021, the price of Axies and SLPs also soared, raising questions about the game’s sustainability.

Sky Mavis earns revenue from the game mainly through breeding and marketplace fees, and Axie Infinity has generated more than US$1.2 billion in revenue. It has also attracted deep-pocketed backers, including US billionaire Mark Cuban.

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But some gaming industry analysts say its business model is unsustainable, pointing to the need for new players to keep money coming in.

Jonathan Teplitsky of blockchain firm Horizen Labs warned most play-to-earn games were a “house of cards”, fuelled by “hype and price speculation”.

“This entire system works well while the Axie company is flush with cash and willing to fuel a massive marketing machine,” he said.

“If Axie wants to survive the next market crash, they will need to build some real-world utility into their game that does not depend on the mood of the markets.”

Sky Mavis co-founder and chief executive Trung Nguyen said Axie Infinity, which is partly owned by players, was “not a zero-sum game”.

“There are a lot of things other than monetary value that people can get from the game.”

It had been clear for months, however, that the game was facing an issue with its economy, and the SLP and the AXS have experienced the kind of volatility seen in many other crypto assets.

Last year, as the game upgraded to allow easier and cheaper trading, the value of SLP rocketed from 3.5 US cents on April 26 to 36.5 US cents on May 2 – more than 900 per cent in less than a week – according to crypto data provider CoinGecko.

But by the end of January this year, it had plunged to just a cent – a huge impact on how much fiat currency players could earn.

Sky Mavis has made some tweaks to the game to limit how many SLPs a player can generate, acknowledging concerns about inflation and unsustainability.

The currency has since recovered slightly to around three cents, but still far from the 2021 gold rush peak.

“People are starting to understand that it’s not free money falling from out of the sky, you do have to understand how to play this game well,” said YGG’s Buenaventura.

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Adding to the woes of players in the Philippines, the country’s tax authority said last year that players should pay tax on their winnings from the game.

In Manila, Lumabi’s monthly earnings have more than halved since he started playing, but he is unfazed by the volatility.

He recently bought two teams of Axies for his girlfriend and one of his sisters. He plans to turn them into Axie Infinity scholars.

“As long as I can earn 100 pesos or a thousand a month, my perspective is it is still a profit,” he said. “It’s still another source of income.”