The token contract is the smallest part of launching a stablecoin. A fiat-backed stablecoin is a regulated payments business: reserves at banks, mint and redemption operations, attestations and compliance controls, with a smart contract on top. Since 2024 and 2025, the EU and US have each written specific rules for it.
The main stablecoin designs
| Design | What backs the peg | Examples | Key risk |
|---|---|---|---|
| Fiat-backed | Cash and short-term government debt held by the issuer or a custodian | USDC, USDT, PYUSD | Issuer, bank and reserve-management risk |
| Crypto-collateralized | Over-collateralized crypto locked in smart contracts | DAI / USDS, LUSD | Collateral crashes and oracle failures |
| Synthetic / hedged | Crypto plus offsetting derivatives positions | Ethena's USDe | Funding-rate, exchange and custody risk |
| Algorithmic (unbacked) | A second token minted and burned to defend the peg | TerraUSD (collapsed 2022) | Death-spiral when confidence breaks |
This page focuses on issuer-backed stablecoins. Collateral-based and hedged designs that run on smart contracts are covered in the decentralized stablecoin guide.
How a fiat-backed stablecoin operates
Minting and redemption
Approved customers (often institutions, exchanges and fintechs) wire dollars to the issuer's reserve account. After the funds clear and the customer passes onboarding checks, the issuer mints the same amount of tokens to the customer's whitelisted address. Redemption is the reverse: tokens are sent to the issuer, burned, and dollars are wired out. Retail users usually buy and sell on exchanges rather than redeeming directly. The peg holds because large holders can always arbitrage between market price and the 1:1 redemption.
The token contract
Most issuers deploy an ERC-20 (and equivalents on other chains) with features that pure DeFi tokens avoid:
- Role-based minting and burning so only authorized minters can create supply, often with per-minter allowances.
- Freezing or blacklisting addresses in response to court orders and sanctions. Regulators generally expect this capability.
- Pausing in emergencies.
- Upgradeability through a proxy, with admin keys in hardware-backed multisig or MPC custody.
- Permit-style approvals (EIP-2612) and sometimes EIP-3009 transfer authorizations for gasless payments.
The privileged roles are the attack surface. A compromised minter key can create unbacked tokens, so minting should require multiple approvals and be monitored against reserve movements in real time. Get these contracts independently reviewed through a smart contract audit.
Reserves and transparency
Reserves are typically held as bank deposits, short-dated Treasury bills and reverse repos, often through a segregated fund. Regular attestations by an accounting firm compare reserves to tokens outstanding. Publishing on-chain supply alongside reserve reports is now the norm for credible issuers.
Regulation in the US and EU
United States. The GENIUS Act, signed in July 2025, created a federal framework for payment stablecoins. In broad terms, it limits issuance to permitted issuers (bank subsidiaries and licensed nonbank issuers, with a state route for smaller issuers), requires one-to-one reserves in high-quality liquid assets such as cash and short-term Treasuries, mandates regular public reserve disclosures, and bars issuers from paying interest to holders. Agencies have been issuing rules to implement it.
European Union. MiCA's stablecoin provisions have applied since mid-2024. A token referencing a single official currency is an e-money token (EMT) and must be issued by a licensed credit or e-money institution; tokens referencing baskets or other assets are asset-referenced tokens (ARTs) with their own authorization. Exchanges in the EU have delisted or restricted stablecoins that lack MiCA authorization.
Build sequence
- Decide the legal structure and licensing route before anything else; it dictates who can issue.
- Set up banking and custody for reserves, plus attestation arrangements.
- Build the operations platform: customer onboarding, mint and redeem requests, treasury reconciliation, reporting.
- Write and audit the token contracts for each chain, with role separation and monitoring.
- Integrate distribution: exchanges, wallets, payment processors and, where relevant, cross-chain transfer through burn-and-mint rather than wrapped bridges.
When not to issue your own
If you want stable value inside your app, using an existing regulated stablecoin is almost always cheaper and safer than issuing one. Issuance makes sense for banks, payment companies and platforms with a regulatory license and a distribution channel. For token mechanics in general, see the cryptocurrency development guide; for institutional use cases, see blockchain in finance.
Frequently asked questions
Can a startup launch a USD stablecoin?
Under the GENIUS Act and MiCA, issuance requires authorization, so the realistic path is partnering with a licensed issuer or using a white-label issuance service from one, not deploying a token yourself.
Why do stablecoin contracts have blacklist functions?
Issuers must comply with sanctions and court orders. The trade-off is that holders trust the issuer not to misuse freezing powers.
How do stablecoins move across chains?
The safest approach is native issuance on each chain or a burn-and-mint transfer protocol run by the issuer. Third-party wrapped versions add bridge risk.
Can stablecoin holders earn interest?
The GENIUS Act prohibits issuers of payment stablecoins from paying interest or yield to holders. Yield products built by third parties raise separate regulatory questions.