The exact list of all countries where Robinhood Chain itself is accessible as a permissionless L2 has not been fully enumerated in official sources. However:
The most specific official number available: 30+ EU/EEA countries for Robinhood's tokenized stock services, plus broader global access for the permissionless chain itself .
The user's question references the testnet processing "over 100 million transactions." All available official and reputable sources report the testnet milestone as 4 million transactions in its first week . No credible source has been found for a 100 million transaction figure. The 4 million figure was cited by Robinhood CEO Vlad Tenev, confirmed by SEC-filed reports, and widely reported across Yahoo Finance, The Street, Stocktwits, and BlockEden
. If you have a source for 100M+, please share it for verification — the current best evidence points to 4M as the peak publicly reported testnet volume.