SPYx leads tokenized ETF market cap growth by $8M in seven days

A tokenized version of the world’s most popular stock market ETF just had a very good week. SPYx, a blockchain-based tracker certificate offering 1:1 economic exposure to the SPDR S&P 500 ETF Trust (SPY), added roughly $8.4 million in market cap over seven days, placing it at the top of the tokenized ETF leaderboard.

That growth pushed SPYx’s total market cap into the range of $67M to $74M, a figure that would have seemed ambitious when the token launched barely a year ago.

What SPYx actually is

Think of SPYx as a mirror image of the SPY ETF, but living on a blockchain instead of sitting inside a brokerage account. Each SPYx token represents economic exposure to one share of SPY, backed by custodian-held shares of the underlying ETF. It doesn’t grant voting rights, and dividends get reinvested through token rebalancing rather than paid out as cash.

The product operates under the xStocks framework, a tokenized equities initiative created by Backed Assets (JE) Limited in partnership with Kraken. It launched in June 2025 primarily on the Solana blockchain, though it’s also accessible on Ethereum and other networks.

The key selling point is access. SPYx was designed primarily for non-US investors who want exposure to S&P 500 returns without navigating the friction of traditional brokerage accounts, currency conversions, and market-hours limitations. Because it lives on-chain, SPYx trades 24/7, which is a meaningful upgrade over the roughly 6.5 hours per day that US stock exchanges are open.

The holder base reflects genuine traction. SPYx currently counts between 63,000 and 77,000 token holders.

Why $8.4M in a week matters

The entire tokenized ETF sector sits at approximately $639M in total market cap. SPYx capturing $8.4M in new inflows over a single week means one product is responsible for a disproportionate share of the sector’s growth momentum.

Kraken recently launched yield vaults for SPYx holders, enabling them to earn additional returns beyond the S&P 500’s price appreciation. Lending pools have also been integrated, creating a secondary market for SPYx liquidity that doesn’t exist in the traditional ETF world.

The bigger picture for tokenized equities

The xStocks framework appears to have found a workable model by targeting non-US investors and structuring the product as a tracker certificate rather than a direct share. That legal architecture sidesteps some of the thornier securities-law questions that have slowed competitors.

SPYx’s daily trading volumes have regularly exceeded $20M, which puts it in a different category from many tokenized assets that technically exist on-chain but rarely change hands.

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