$ARB
Robinhood’s public blockchain reportedly evaluating fees for transaction priority

According to a CoinDesk report citing people familiar with the matter, Robinhood Chain—a Layer 2 blockchain built for tokenized financial assets—is evaluating a transaction-ordering mechanism that would let users pay fees to have certain transactions processed first. Robinhood declined to comment, while Arbitrum developer Offchain Labs did not immediately respond.

Arbitrum replaced Timeboost with priority-fee auctions on September 24

Robinhood Chain is built on technology provided by Arbitrum. Arbitrum previously offered a paid ordering service called Timeboost, through which successful bidders could gain a 200-millisecond head start. On September 24, Arbitrum announced the launch of a new mechanism called Priority Gas Auctions. CoinDesk reports that Robinhood Chain is evaluating this new mechanism.

Under a governance proposal from the Arbitrum community, transaction order in the new mechanism is determined by the priority fees attached to each transaction. Transactions are ranked by priority fee in auctions held every 125 milliseconds, and a block is produced every 250 milliseconds. Transactions with low or no priority fees will also be included within a few blocks rather than being left at the back of the queue indefinitely. The proposal also stipulates that 97% of priority-fee revenue goes to the Arbitrum DAO treasury, while 3% goes to the Arbitrum Developer Guild.

The proposal explains that Timeboost launched on Arbitrum One in April 2025, but many businesses that initially took part in the auctions later dropped out. The need to bid in advance also made the system difficult to adopt, prompting the shift to a model where users bid on each transaction individually.

Robinhood Chain still uses a first-come, first-served ordering rule

CoinDesk reports that Robinhood Chain currently orders transactions on a first-come, first-served basis and has never used Timeboost. Since launching in July, the chain has grown rapidly and has entered the top ten blockchains by total value locked.

CoinDesk also notes that Robinhood’s traditional brokerage business has long profited from “payment for order flow,” in which market makers pay brokerages for the opportunity to execute customer orders. On a blockchain, paid priority ordering lets traders pay to have their transactions processed faster, helping professional trading firms pursue fleeting trading opportunities.

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