BEP-2 was the technical standard for creating and managing tokens on Binance Chain, a blockchain launched by the Binance exchange in April 2019. BEP stands for BNB Evolution Proposal, Binance's equivalent of the proposal systems used by other networks. A BEP-2 token could be issued, transferred, frozen, burned and listed on Binance DEX, the chain's built-in decentralized exchange, without writing a smart contract. Binance Chain was renamed BNB Beacon Chain in 2022.
BEP-2 belongs to a family of token standards that includes Ethereum's ERC-20 and the BEP-20 standard used on BNB Smart Chain. Unlike BEP-20, BEP-2 tokens lived on a chain designed mainly for fast trading rather than general-purpose programming. As BNB Smart Chain grew, the Beacon Chain lost its role, and it was retired through a process known as BNB Chain Fusion that concluded in 2024. BEP-2 is therefore mainly of historical interest today, though it still appears in older exchange records, wallets and documentation.
BEP-2 in plain terms
Think of a shopping centre that issues its own standard gift vouchers. Any shop in the centre can print vouchers in that format, and every till in the building knows how to accept them. There is no need for each shop to design its own system from scratch, because the rules are already set out.
BEP-2 was that standard voucher format for Binance Chain. Projects could create a token with a few commands, and wallets, explorers and the chain's own exchange knew how to handle it. Later the shopping centre moved to a bigger, more flexible building next door, BNB Smart Chain, and the old building was closed after everyone was asked to bring their vouchers across.
History
Binance launched its own blockchain in April 2019, aiming to offer on-chain trading with fast settlement. Its native coin, BNB, had originally been issued as an ERC-20 token on the Ethereum blockchain in 2017, and Binance swapped those tokens for BEP-2 BNB on the new chain. Many projects issued BEP-2 versions of their tokens, and some stablecoins, including Binance USD, were available in BEP-2 form. In September 2020 Binance launched Binance Smart Chain, a separate network compatible with the Ethereum Virtual Machine, which supported smart contracts and quickly attracted decentralized finance activity. In 2022 the two networks were rebranded as BNB Beacon Chain and BNB Smart Chain under the BNB Chain name. Developers then proposed BNB Chain Fusion, which moved staking and governance to BNB Smart Chain and shut down the Beacon Chain in 2024.
How BEP-2 tokens worked
BEP-2 tokens were native assets of the chain rather than programs running on it. Key features included:
- Simple issuance. An issuer set a name, a symbol and a total supply, and the chain added a short random suffix to the symbol, so tokens appeared in forms such as "ABC-1A2" to prevent clashes.
- Built-in functions. Issuers could mint more tokens if the token was set as mintable, burn tokens, and freeze or unfreeze balances held by their own address.
- Fees in BNB. Every transaction paid a small fixed fee in BNB rather than variable gas.
- Exchange listing. Tokens could be paired with BNB or other assets on Binance DEX through an on-chain listing process.
- Addresses and memos. Addresses began with "bnb", and deposits to exchanges often required a memo field to identify the customer.
The chain used a consensus engine derived from Tendermint, with a small set of validators, and produced blocks roughly every second. Its design traded flexibility for speed: there were no general-purpose smart contracts, which limited what developers could build.
BEP-2 compared with BEP-20
| Feature | BEP-2 | BEP-20 |
|---|---|---|
| Network | Binance Chain / BNB Beacon Chain | BNB Smart Chain |
| Implementation | Native chain asset | Smart contract, similar to ERC-20 |
| Programmability | Limited to built-in functions | Fully programmable |
| Fees | Fixed BNB fee per action | Gas paid in BNB |
| Status | Retired with the Beacon Chain in 2024 | Active |
For several years the two chains were linked by a native cross-chain bridge, so a BEP-2 token could be moved to BNB Smart Chain and appear there as a BEP-20 token, and back again. Exchanges and wallets often asked users to choose between the two networks when withdrawing, and sending funds on the wrong one was a frequent cause of support requests.
Retirement and remaining risks
As part of BNB Chain Fusion, holders of BEP-2 tokens were encouraged to move them to BNB Smart Chain before the Beacon Chain stopped. Staked BNB was migrated to the new staking system on BNB Smart Chain, and the cross-chain bridge was closed. After shutdown, BNB Chain provided a recovery tool for some assets left behind, based on cryptographic proofs of balances from the final state of the old chain, though whether a given token can be recovered depends on its issuer having bridged it. Users who still hold BEP-2 tokens in old wallets, or who see deposit addresses beginning with "bnb", should check current BNB Chain guidance rather than sending funds. The episode shows that a token standard is only as durable as the chain it lives on, and that wrapped or bridged versions of an asset can outlast the original network. Related risks of moving value between networks are covered under crypto bridges and blockchain interoperability.