FDUSD is a US dollar stablecoin issued by First Digital Labs, with reserve assets custodied by First Digital Trust Limited, a registered trust company in Hong Kong. Each token is designed to redeem one-for-one against a dollar, backed by short-dated US Treasury bills, overnight reverse repos, and cash held at banks in Hong Kong, Switzerland, and Australia. FDUSD launched in July 2023 and circulates on Ethereum and BNB Chain, with later deployments on Solana, Sui, Arbitrum, and TON.

The token is unusual among major stablecoins in two respects. Its issuer sits in Hong Kong rather than the United States, and its volume is concentrated almost entirely on a single venue: Binance, which lists FDUSD as a zero-fee trading pair against dozens of assets. That dependence on one exchange shaped both FDUSD's rapid rise and the April 2025 episode that briefly knocked it off its peg.

First Digital traces its corporate lineage to Legacy Trust Company, a custodian established in 1992 under Hong Kong's Trustee Ordinance. First Digital Trust Limited is registered as a public trust company under that same ordinance (Chapter 29) and operates as a licensed Trust or Company Service Provider under Hong Kong's Anti-Money Laundering and Counter-Terrorist Financing Ordinance (Chapter 615).

The stablecoin itself is issued by FD121 Limited, a subsidiary within the First Digital group. First Digital Trust Limited holds the reserve assets, and the structure is designed so reserves stay segregated from the trust company's own balance sheet. That segregation is meant to isolate FDUSD holders from a bankruptcy of the operating entity, a standard arrangement for regulated trust-issued stablecoins.

This is a different regulatory footing from the two largest US dollar stablecoins. Circle issues USDC under US state money-transmitter licensing and now the federal framework, and Tether operates from outside the US entirely. First Digital sits in Hong Kong, a jurisdiction that introduced its own stablecoin licensing regime in 2025. Anyone evaluating FDUSD is evaluating a Hong Kong trust structure, not a US-regulated issuer.

FDUSD follows the fiat-collateralized model. A user or institution deposits dollars with First Digital, the issuer mints an equivalent number of FDUSD tokens, and those tokens move freely onchain. To exit, a holder redeems FDUSD back to the issuer and the tokens are burned. The reserve backing each token is held in instruments chosen for liquidity rather than yield: very short-dated US Treasury bills, overnight reverse repurchase agreements, and bank cash.

Most retail holders never touch the mint-and-redeem flow directly. Direct redemption is generally an institutional channel. Ordinary users acquire and dispose of FDUSD by trading it on an exchange, and in practice that exchange is almost always Binance, where FDUSD serves as a fee-free base pair. This is the mechanical reason FDUSD's supply tracks Binance activity so closely.

First Digital publishes independent attestation reports on a monthly cadence, intended to confirm that circulating FDUSD is fully matched by reserves. An attestation is a point-in-time accountant's verification, not a full financial audit, which is the same standard most fiat-backed stablecoins use. The recurring transparency question for FDUSD, and the one the 2025 depeg sharpened, is what exactly sits inside those reserves and how often it is verified.

The reserves themselves are held across financial institutions in Hong Kong, Switzerland, and Australia rather than concentrated in a single banking jurisdiction. First Digital frames this as diversification, though it also means the backing sits outside the US banking system entirely. The instrument mix is deliberately conservative: rather than reaching for yield in longer-duration paper or commercial obligations, the issuer states it holds T-bills of very short maturity plus overnight reverse repos, the most liquid end of the dollar money market. Short duration matters because it lets the issuer convert reserves to cash quickly if redemption demand spikes, which is the exact scenario a depeg scare creates.

FDUSD's growth was effectively an extension of Binance's trading engine. After Binance phased out its support for BUSD in 2023 following the action against BUSD issuer Paxos by the New York Department of Financial Services, FDUSD stepped into the gap as a primary zero-fee trading pair on the exchange. Market capitalization climbed past 1 billion dollars within months of launch and exceeded 2.5 billion dollars by early 2024 (PR Newswire, December 2023; CoinMarketCap historical data).

That concentration cuts both ways. It gave FDUSD deep liquidity inside one venue, but it also means demand is tied to one exchange's promotional structure rather than to broad payment or settlement use. By April 2026, circulating supply had fallen back toward the few-hundred-million range before recovering, reflecting how sensitive the token is to Binance trading conditions and listing decisions (CoinGecko, CoinMarketCap, 2026). A stablecoin whose float swings with a single venue behaves differently from one distributed across many exchanges, wallets, and payment rails.

The contrast with USDC and USDT is instructive. Tether's USDT is listed as a base pair on effectively every centralized exchange and is embedded across remittance corridors and onchain DeFi, so no single venue's decisions move its float much. Circle's USDC anchors a large share of onchain lending and is the default settlement asset in many institutional flows. FDUSD never developed that breadth. Its utility is largely as Binance trading collateral, which is why its market cap rose and fell with promotional zero-fee listings rather than with independent payment adoption. Understanding FDUSD means understanding that its demand curve is mostly an exchange story.

On April 2, 2025, Tron founder Justin Sun posted on X that First Digital Trust was "effectively insolvent and unable to fulfill client fund redemptions." FDUSD reacted immediately, trading as low as 0.87 dollars within hours, a drop of roughly 13 percent from its dollar peg (Blockworks, Decrypt, BeInCrypto, April 2025).

First Digital Trust rejected the claim the same day, calling it false and part of what it described as a defamatory campaign, and said it would pursue legal action. The company stated that FDUSD remained fully solvent and backed one-for-one by US Treasury bills. It also drew a distinction the headlines often blurred: the underlying dispute concerned TrueUSD (TUSD), a separate stablecoin, not FDUSD itself. Court filings reported around that time described a conflict in which Techteryx, the entity behind TUSD, sued First Digital Trust's leadership over the handling of roughly 456 million dollars in TUSD reserves (Cointelegraph, April 2025).

FDUSD recovered toward its peg within about a day, trading near 0.99 against USDT by the morning of April 3, 2025. Onchain data via Etherscan showed First Digital honored roughly 25.8 million dollars in FDUSD redemptions through the episode, which the issuer pointed to as evidence that the redemption channel kept functioning (Cointelegraph, Money Transmitter Law, April 2025). First Digital's custodian also published an attestation report stating 1:1 reserve backing, and the company scheduled a public X Spaces session to address holders directly.

The mechanics of the dislocation are worth separating from the accusation. A stablecoin depeg of this kind is usually not a statement about reserves at all in the moment it happens. It is a liquidity event: holders rush to sell on the secondary market faster than arbitrageurs and the redemption channel can absorb the flow, so the trading price drops below a dollar even if every token remains fully redeemable at par. The 13 percent dip and the same-day recovery are consistent with that reading, since the redemption channel kept clearing and the price snapped back once panic selling exhausted itself. What the episode did not resolve is the slower question of reserve verification, which is why attestation cadence and composition remain the substantive points of scrutiny rather than the price chart from those two days.

The factual record is therefore narrow: a public solvency allegation tied to a separate TUSD dispute, a same-day denial, a brief price dislocation, continued redemptions, and a recovery. The episode is a useful case study in how a confidence shock propagates through a thinly distributed stablecoin, and in why reserve composition and attestation cadence are the questions holders return to.

FDUSD was first issued on Ethereum and BNB Chain, and those two networks remain its primary homes. Ethereum hosts the deepest DeFi integrations and the most institutional tooling, while BNB Chain offers low fees and tight coupling to the Binance ecosystem where most FDUSD trading occurs. The token later expanded to Solana and Sui at the end of 2024 and to Arbitrum and TON, but Ethereum and BNB Chain carry the bulk of supply and activity.

Because FDUSD exists as separate token contracts on each chain, moving a balance from one network to another is not a single onchain transfer. It requires either a bridge or a mint-and-redeem cycle through the issuer. That fragmentation is common to every multi-chain stablecoin and is exactly the friction that cross-chain routing infrastructure exists to absorb.

Set against USDC and USDT, FDUSD differs less in its core mechanism than in its issuer profile and distribution. All three are fiat-collateralized, redeemable one-for-one, and backed largely by short-dated Treasuries and cash. The distinctions that matter for FDUSD are jurisdictional and structural.

USDC, issued by Circle, is the most regulation-forward of the three and publishes monthly reserve reports with the bulk of reserves in the Circle Reserve Fund. USDT, issued by Tether, carries the deepest global liquidity and the broadest exchange listing. FDUSD is a Hong Kong trust-issued token whose circulation is concentrated on Binance. For a holder, that concentration is the defining trait: liquidity is excellent inside that venue and thinner outside it, which is the opposite of USDT's spread-everywhere profile.

None of these traits makes one token correct and another wrong. They describe different distribution and regulatory shapes, and the right fit depends on where the holder transacts and what redemption assurances they need.

A stablecoin is only as useful as the rails that move it. FDUSD lives natively on several chains but most of its liquidity concentrates on BNB Chain and inside Binance, so getting value to where it is needed often means crossing networks. Eco Routes is built for exactly that problem: moving stablecoin value across chains with settlement guarantees, so applications and users can treat a dollar on one network the same as a dollar on another. For teams routing FDUSD, USDC, or USDT between Ethereum, BNB Chain, and beyond, that cross-chain layer is what turns a single-venue token into something usable across the broader onchain economy.

First Digital states that FDUSD is fully backed one-for-one by reserves held in short-dated US Treasury bills, overnight reverse repos, and bank cash, custodied by First Digital Trust Limited in Hong Kong. The issuer publishes monthly independent attestation reports verifying that circulating supply is matched by reserves. Attestations are point-in-time verifications rather than full audits, which is standard for fiat-backed stablecoins.

On April 2, 2025, Justin Sun publicly alleged that First Digital Trust was insolvent, and FDUSD fell to roughly 0.87 dollars within hours. First Digital denied the claim the same day, said the underlying dispute involved the separate TUSD stablecoin rather than FDUSD, and continued processing redemptions. The token recovered toward its dollar peg within about a day.

FDUSD launched on Ethereum and BNB Chain in 2023 and later expanded to Solana, Sui, Arbitrum, and TON. Ethereum and BNB Chain carry the majority of supply and trading activity, with BNB Chain closely tied to Binance, where most FDUSD volume occurs.

FDUSD is issued by FD121 Limited within the First Digital group, with reserve assets custodied by First Digital Trust Limited, a registered trust company under Hong Kong's Trustee Ordinance. This places FDUSD under a Hong Kong trust structure rather than US issuer regulation.