Dear Poloniex Users,

Poloniex will support the Optimism(OP) and BASE Network Upgrades with the following plan:

Poloniex will suspend the deposit and withdrawal services for tokens of Optimism(OP) and BASE Chain at 14:00:00 (UTC) on May 9, 2025;

You may deposit tokens of Optimism(OP) and BASE Chain in advance. We will handle all technical requirements involved for all users.

Please note:

● The Optimism(OP) and BASE Network Upgrades will take place approximately at 16:00:00 (UTC) on May 9, 2025 ;

● The tokens of Optimism(OP) and BASE Chain trading of will not be affected during the network upgrades.

● The network upgrades will not result in creation of new tokens.

● Poloniex will resume deposits and withdrawals for tokens of Optimism(OP) and BASE Chain once we deem the upgraded network to be stable, which will not be further announced.

For more information, please refer to:

https://github.com/ethereum-optimism/optimism/releases/tag/op-node/v1.13.2

https://github.com/base/node/releases/tag/v0.12.3

Poloniex

May 7, 2025