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The Uniswap API has emerged as the dominant routing provider inside MetaMask’s swap architecture on Ethereum mainnet, according to an independent analysis by researcher Vaish.
Vaish examined 554,137 successful swaps over 99 days, representing $567.8 million in total volume. The study found that the Uniswap API won 52.4% of all routed transactions by count—more than every competing provider combined—while also showing lower slippage and the lowest failure rate among major providers.
MetaMask uses a multi-provider swap architecture in which each trade request is sent to roughly a dozen routing providers simultaneously. The platform then selects the best quote net of fees for the user.
Vaish’s analysis attributes Uniswap’s lead to realized execution outcomes. The study measured slippage as the deviation between a user’s actual fill and the on-chain mid-price at execution time.
Since Uniswap’s API integration in March 2026, it has consistently won more head-to-head quote competitions than rivals, based on the routing outcomes observed in the dataset.
Uniswap’s API recorded the lowest median slippage across all five trade-size buckets, ranging from 0.21 to 0.88 basis points. Competitors recorded median slippage between 1 and 27 basis points.
The Uniswap API also posted a failure rate of 0.12%, the lowest among all major providers. Competing platforms recorded failure rates between 0.27% and 0.64%.
Vaish noted that the routing advantage held across pair types, gas conditions, and times of day, with transaction share remaining between 52% and 55% in every UTC hour.
On raw dollar volume, OKX led the dataset with 25.3% versus Uniswap’s 21.3%. However, Vaish found that OKX’s volume share was driven by extreme wallet concentration.
OKX’s $143.8 million in volume came from 13,850 wallets, with the top 10 wallets accounting for 48% of that total. Vaish also highlighted that a single intermediary contract operated by one signer sent $42.6 million through OKX across just six transactions—representing roughly 30% of OKX’s total volume in the study period.
Vaish contrasted the two ways of measuring routing performance: routing share by transaction count reflects independent quote competitions (one per user decision), while routing share by raw volume can be skewed by a small number of large actors.
Uniswap’s volume was drawn from 134,876 wallets, with only 5.4% concentrated among its top 10. After excluding the top 100 wallets from each provider, Uniswap led adjusted volume ranking at 32.9%.
In that adjusted view, Kyber followed with 18.2%, 1inch v6 with 15.7%, OKX with 13.3%, and 0x with 12.9%.
Vaish reported that on routes involving five or more legs, OKX captured 43.1% of volume while Uniswap dropped to 4.1%. The analysis links this split to a structural divide: AMM-based routing performs strongest on standard retail trades, while RFQ desks hold an edge on complex, large-ticket routes above $100,000.
Finally, Vaish found that Uniswap was the only major provider whose share rose consistently under progressive whale exclusion.
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