Base's B20 lands today: a token standard with built-in seatbelts 🪙

Base, the Ethereum layer-2 network backed by Coinbase, is scheduled to activate its B20 token standard on mainnet at 6 pm UTC, providing developers with a native framework for issuing stablecoins, tokenized real-world assets, tokenized equities and other fungible tokens without deploying custom ERC-20 contracts. According to Base documentation, the standard supports two variants: an asset variant with configurable decimals between six and 18, and a stablecoin variant with fixed six-decimal formatting that requires issuers to specify a fiat currency denomination such as the US dollar or euro.

B20 was introduced as part of the network's Beryl upgrade, which went live on June 26. The upgrade shortened withdrawal waiting periods from seven days to five days and added technical changes aimed at improving network performance. Base said B20 tokens are compatible with standard ERC-20 tokens and include built-in issuer controls covering supply limits, transfer rules, minting, burning, pausing and transaction notes.

The B20 activation follows two sequencer-linked outages on June 25 and June 26. In a post-mortem, Base attributed the incidents to a sequencer bug, with the first outage lasting about 116 minutes after an invalid block was sequenced and prevented new blocks from being created, and a second outage lasting about 20 minutes after a race condition prevented sequencers from catching up following a system reset. Block production resumed on June 25 after a nearly two-hour halt. The Beryl upgrade was delayed by one day due to a separate B20 activation registry timing issue.