First Digital USD
FD121 Ltd (First Digital)
Market cap (static): ~$1.5B
Overview
Launched June 2023 to replace Binance's BUSD after wind-down. Primarily used for high-frequency trading pairs on Binance and MEXC. Issued by BVI-registered entity (transitioned from Hong Kong in August 2025), reserves held in trust by First Digital Trust.
Features
Engineering-oriented breakdown of capabilities: standards, who they matter for, integration rationale, per-feature risks, and vetted external references (specs, docs, verified source).
| Feature | Standards | Audience | Why it matters | Risk / caveat | References |
|---|---|---|---|---|---|
EIP-3009 gasless transfers on BSC authorization |
| User | Gas sponsorship on BNB Chain via `transferWithAuthorization` — enables commerce-style flows similar to USDC. | Relayer and nonce handling identical caveats to other EIP-3009 deployments. | |
Bankruptcy-remote trust structure compliance | — | Corporate | Legal ring-fencing for reserves — institutional due diligence, not on-chain enforceable. | Legal regime and trust deed determine real protection; not visible in Solidity. | |
Chainlink PoR oracle compliance |
| Both | On-chain FDUSD/USD feed on BNB — contracts can anchor off-chain logic to oracle answers. | Oracle downtime or deviation thresholds can block dependent protocols. | |
Monthly attestations compliance | — | Corporate | Periodic attestations for reserve reporting — ops/compliance monitoring. | Attestation lag vs real-time market; not on-chain proof. | |
Issuer mint/burn/freeze compliance |
| Corporate | Centralized controls typical of fiat-backed issuers — same integration caveats as USDT/USDC. | Blacklist/pause can strand positions in smart contracts holding FDUSD. |
EIP / ERC support matrix
Standards support for FDUSD. Click an EIP to jump to the global deep-dive section.
| Standard | Status | Notes |
|---|---|---|
| ERC-20 Fungible token standard | Implemented | Standard wallet and CEX integration; DeFi depth is thinner than USDT/USDC. |
| EIP-712 Typed structured data signing | Partial | Required to build relayer-signed payment flows wherever EIP-3009 is live. |
| EIP-2612 Permit — gasless ERC-20 approval | Unknown | If permit is absent, DeFi UX falls back to classic approve or Permit2. |
| EIP-3009 transferWithAuthorization | Partial | Enables sponsored transfers on chains where the upgrade is live; critical for payment SDK parity with USDC on those chains. |
| EIP-1967 Standard proxy storage slots | Unknown | Proxy detection drives correct ABI attachment in indexers and wallets. |
| EIP-1822 UUPS — universal upgradeable proxy | Unknown | Affects how upgrade safety is reasoned about in audits. |
| ERC-4626 Tokenized yield vault standard | Not implemented | Yield requires external protocols. |
| EIP-1271 Signature validation for smart contracts | Not implemented | Smart contract wallets use standard permit only if EIP-2612 exists. |
Technical notes
Standard ERC-20/BEP-20 with issuer admin — mint, burn, blacklist. EIP-3009 BSC upgrade (Dec 2025) adds transferWithAuthorization function for gasless BNB Chain transfers. Chainlink oracle: FDUSD/USD price feed on BNB Chain mainnet. Always verify contract address on official docs before integration.
Reserves & peg
- Reserves
- Cash and cash equivalents held in trust by First Digital Trust Ltd
- Collateral
- Fiat (off-chain)
- Peg mechanism
- Hard 1:1 via trust company redemption
- Auditor
- Independent attestor (monthly)
Ecosystem
- DeFi integration
- Primarily CEX trading pairs on Binance — limited on-chain DeFi integration
- Yield
- None
Risk factors
Networks & contracts
Deployments by chain — primary rows are highlighted. Always verify addresses against issuer docs before mainnet integrations.
| Network | Standard | Contract | Explorer |
|---|---|---|---|
EthereumPrimary | ERC-20 | 0xc5f0f7b66764F6ec8C8Dff7BA683102295E16409 | View |
BNB ChainPrimary | BEP-20 | 0xc5f0f7b66764F6ec8C8Dff7BA683102295E16409Same address, different chain | View |
ArbitrumSecondary | ERC-20 | 0x0000000000000000000000000000000000000000Address not in static spec — verify native Arbitrum deployment on official First Digital docs before integration. | View |
TONSecondary | Jetton | See official FDUSD TON deploymentNative deployment July 2025, Telegram ecosystem | — |
Engineering deep dive
Integration notes
FDUSD is optimised for exchange rails more than deep DeFi composability—verify BSC EIP-3009 support on the deployment you target before building meta-transaction flows.
Ops
Treat attestations and oracle feeds as part of your monitoring stack if you custody or list FDUSD programmatically.