USDB (USDB)

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Overview

USDB is a digital dollar used on Blast, a network built on top of Ethereum. It is designed to stay close to the value of one U.S. dollar. Its main feature is native yield: a USDB balance can grow automatically while the tokens remain in a wallet. Blast calls this process rebasing. People can also send USDB, trade it, or use it in apps built on Blast. (blast.io)

Blast is an Ethereum layer 2. It handles activity on its own network while using Ethereum as part of its underlying infrastructure. For USDB, that means transfers and app activity happen on Blast, while the route into and out of the network connects to assets on Ethereum. Understanding that bridge is central to understanding how the stablecoin works. (blast.io)

History & Team

Built for Blast’s native-yield design

USDB grew out of Blast’s plan to make yield a built-in feature for both ETH and stablecoins. The network was active by March 2024, when the Blast Foundation reported that apps were live on its mainnet. Rather than asking every app to build a separate savings feature, Blast made yield available at the network level. USDB became the dollar-focused asset in that design. (blast.io)

Blast identifies Pacman, the creator of the Blur NFT marketplace, as a leading figure behind the network. Its published team description brings together people with experience in technology and decentralized finance. Blast has also named Paradigm and Standard Crypto among the backers of its contributors. Those are details about the broader Blast project; USDB is the stablecoin used within that project. (blast.io)

The ecosystem has changed since its early rewards campaigns. In January 2025, the Blast Foundation said it was moving away from Points and Gold toward incentives paid in BLAST, the network’s separate token. It also described Blast Mobile products that use USDB behind the scenes. These developments show how the stablecoin has served both on-chain apps and a simpler mobile experience. (blog.blast.io)

Technology & How It Works

Bridging, backing, and rebasing

USDB is created through Blast’s stablecoin bridge. A user can move a supported stablecoin, such as DAI, USDC, or USDT, from Ethereum to Blast and receive USDB on Blast. Blast’s description of the system links USDB’s yield to MakerDAO’s on-chain Treasury-bill-related protocol. When USDB is bridged back to Ethereum, Blast says it can be redeemed for DAI. Thus, the asset received on the return trip is DAI, even when the original deposit used another supported stablecoin. (blast.io)

Rebasing changes how a holder sees their balance. In the automatic setting, yield is reflected by an increase in the number of USDB tokens held. For example, someone who starts with 100 USDB may later see a balance above 100 USDB if yield has accrued. This differs from a system that keeps the token count fixed and shows earnings in a separate account. The amount earned depends on the yield available through the underlying system; it is not a fixed feature of each token. (test-docs2.blast.io)

Blast’s developer documentation lists three yield settings for USDB accounts: automatic, claimable, and void. Automatic is the default for ordinary wallets and smart contracts. A claimable setting lets a contract collect yield separately, which can help an app decide when and where to distribute it. Blast also documents a non-rebasing wrapper called nrUSDB for apps that need a balance that does not change in the same way. (test-docs2.blast.io)

USDB follows an ERC-20-style token interface on Blast. Its mainnet contract address is 0x4300000000000000000000000000000000000003. That address identifies the Blast-native token when a wallet or app needs to add it manually. (test-docs2.blast.io)

Tokenomics & Utility

USDB’s economic model centers on stablecoin deposits, bridge withdrawals, and yield passed through to holders. The number of tokens in circulation can change as users move funds into or out of Blast. Rebasing can also increase balances as yield is distributed. That makes its supply different from a cryptocurrency launched with a fixed number of tokens set aside for founders, investors, and community rewards. (blast.io)

The token has two closely linked jobs. First, it gives Blast users a dollar-denominated asset for transfers and app transactions. Second, it carries the network’s native stablecoin yield into wallets and compatible smart contracts. A developer can build around that feature, while a holder using the default setting sees yield reflected in the USDB balance. (blast.io)

USDB and BLAST have different roles. USDB is the dollar-focused stablecoin. BLAST is the network token used in Blast’s incentive and governance system. Some Blast products have used BLAST rewards alongside USDB, but a BLAST reward and a USDB rebase are distinct ways of receiving value. (blog.blast.io)

Ecosystem & Use Cases

USDB works as a common unit of account across Blast apps. A person can hold it between transactions, send it to another Blast address, or swap it for another token on a decentralized exchange. An app can accept USDB as payment without asking users to handle a different unit for every transaction. Its dollar target also makes amounts easier to read than amounts expressed in a changing quantity of ETH. (blast.io)

Decentralized exchanges provide another use case. USDB can be paired with assets such as wrapped ETH, allowing people to trade between a dollar-denominated token and other parts of the Blast ecosystem. App developers can also use USDB in deposits and other products built with smart contracts. In those settings, the choice of yield mode matters: an app may pass rebases into a user’s balance or manage claimable yield under its own rules. (test-docs2.blast.io)

Blast Mobile offers a more direct example. The Blast Foundation described an Earn app that accepts USDB on Blast as well as supported stablecoins on Ethereum, with deposits converted to USDB behind the scenes. Its additional BLAST incentives are a product feature separate from USDB’s basic role as Blast’s native stablecoin. (blog.blast.io)

Advantages & Challenges

USDB’s clearest advantage is convenience within Blast. Users can hold a dollar-focused token and receive native yield without moving it into a separate savings contract. Developers can work with an Ethereum-compatible network and choose how their apps handle that yield. Blast’s bridge also provides a defined route between supported Ethereum stablecoins and USDB. (blast.io)

The same design adds complexity. A changing token balance requires different accounting from a token whose balance stays fixed. A smart contract may need a particular yield setting or a non-rebasing wrapper to keep its records consistent. Users also need to understand that moving back to Ethereum produces DAI through Blast’s described redemption route, rather than necessarily returning the stablecoin first deposited. (test-docs2.blast.io)

USDB’s dollar target is also separate from the price offered in a trade. On a decentralized exchange, a swap is made against a market pool, whose quoted exchange rate may differ from the intended dollar value. Yield depends on the underlying arrangement rather than a permanent rate written into USDB itself. These are important distinctions between holding the token, using the bridge, and swapping on an exchange. (blast.io)

Where to Buy & Wallets

USDB can be purchased through swaps on Blast-based decentralized exchanges, including Uniswap on Blast and Thruster. Another direct way to obtain it is to bridge a supported stablecoin from Ethereum to Blast. A swap uses a trading pair on Blast; a bridge deposit follows Blast’s route for turning a supported Ethereum stablecoin into USDB. (test-docs2.blast.io)

USDB can be held in MetaMask or another EVM-compatible wallet connected to Blast Mainnet. Blast lists 81457 as the network’s chain ID and ETH as its transaction-fee currency. If USDB does not appear automatically, the wallet can display it using the Blast mainnet token address: 0x4300000000000000000000000000000000000003. Holding USDB and paying for a Blast transaction therefore involve two assets: USDB for the balance being used and ETH for network fees. (test-docs2.blast.io)

Regulatory & Compliance

Stablecoin rules depend on the jurisdiction and on how a product is structured. In the European Union, the Markets in Crypto-Assets regulation includes rules for tokens classified as e-money tokens. Its Article 50 bars issuers and related crypto-asset service providers from granting interest on those tokens, and treats certain benefits tied to holding time as interest. USDB’s automatic yield is therefore a significant feature when considering how it could be classified and offered under that framework. (eur-lex.europa.eu)

In the United States, the GENIUS Act, enacted on July 18, 2025, established a federal framework for payment stablecoins. The Office of the Comptroller of the Currency has described the law’s restrictions on issuers paying interest or yield solely for holding or using a permitted payment stablecoin. The law’s application to a product depends on its legal classification and the entities involved. Blast’s published materials explain USDB’s bridge and yield mechanics; those mechanics are the relevant starting point for examining its legal treatment. (occ.gov)

Shariah assessment also turns on how the yield is produced. Islamic finance principles generally avoid receiving interest, while Blast links USDB’s yield to a Treasury-bill-related arrangement through MakerDAO. For readers applying a Shariah screen that prohibits interest-based returns, that yield is a barrier to treating USDB’s yield-bearing design as Shariah compliant. A USDB-specific religious determination would depend on a full review of the arrangement. (blast.io)

Future Outlook

USDB’s long-term role is tied to what people build and use on Blast. Its core features already allow apps to combine dollar-denominated balances with network-level yield. More payment tools, trading apps, and mobile products could put those features to use in different ways. Blast has described USDB as part of its broader aim to make on-chain dollar activity easier to access. (blog.blast.io)

The underlying yield arrangements can also evolve. Blast has said its community could supplement or replace the outside protocols used for native yield with Blast-native or other third-party solutions. Such a change would affect the system behind USDB, while its usefulness in apps would still depend on clear bridge routes, wallet support, and tools that handle rebasing well. (blast.io)

Summary

USDB is Blast’s native, dollar-focused stablecoin. Users can obtain it by bridging supported stablecoins from Ethereum or by swapping on Blast, then hold or use it across the network’s apps. Its defining feature is rebasing: yield can appear as a growing USDB balance. That design makes USDB both a means of exchange and a building block for Blast applications, while making its bridge mechanics and yield settings essential to understanding the token. (blast.io)