Nearly 1 in 5 spot trades is now on-chain — but the record came from the other side shrinking

Decentralised exchanges handled a record 19.5% of global spot crypto trading in July, and the reason is not that on-chain trading grew. Volume on centralised exchanges fell 31.2% to $727 billion, their weakest month since October 2023, while DEX volume also fell, by 9.82%, to $176 billion. The record share is the gap between two declines rather than a migration.

The two venue types work differently. On a centralised exchange, a company holds your funds and matches your order against its own book. On a decentralised exchange, you trade from your own wallet against pooled liquidity and a smart contract settles the swap. Share of volume measures where trades happen; it does not by itself say where a price is set.

The wider numbers point to traders stepping back rather than switching. BlockBeats data has major centralised spot volume down 35.5% month over month, with perpetual futures down a smaller 19.6%. Robinhood recorded $18 billion of crypto trading in the second quarter, down 35% year over year, even as its equity volume rose 85% and options activity rose 50%. Coinbase said consumer spot volume fell 38% year over year, partly offset by derivatives and prediction markets, and TRM Labs estimated that global retail-oriented crypto activity fell 11% year over year to $979 billion in the first quarter, a second straight contraction.

Who remains on-chain looks fairly professional. DefiLlama tracked $73.2 billion of 30-day volume through DEX aggregators such as Jupiter, OKX DEX, 0x, DFlow, KyberSwap and LiquidMesh, routing infrastructure built for moving large orders efficiently. Solana led July's on-chain activity with roughly $49.5 billion, ahead of BNB Chain, Ethereum and Base, and stablecoin pairs alone accounted for about $31.5 billion, close to 30% of the month's DEX total. A 2025 study counted 7.2 million arbitrage trades between centralised and decentralised venues on Ethereum between August 2023 and March 2025, with about $233.8 million extracted by 19 major searchers, three of whom took roughly 75% of it. Telling a retail wallet apart from a bot in the same pool is genuinely hard with public data.

Price discovery still splits by asset. Bitcoin's price is set overwhelmingly on centralised exchanges, in ETFs and in CME futures, because native BTC liquidity on-chain is a minor share of the market, and Ethereum's major pairs still tend to follow centralised venues. Long-tail tokens, Solana launch venues and memecoins behave differently, since many of them trade on-chain long before any exchange lists them.

The number is also reversible. Analysts sketch a path toward a 22% to 25% share as aggregators and larger on-chain orders keep improving, and a path back toward 14% to 16% if risk-taking returns to centralised apps first in a rally, which would make July a denominator effect rather than a turning point. For a beginner, the practical difference matters more than the share: on a decentralised exchange you are your own custodian, and a confirmed swap is final.