What stays the same
Stable maintains full compatibility with the Ethereum development ecosystem:| Area | Compatibility |
|---|---|
| Languages | Solidity, Vyper |
| Tooling | Hardhat, Foundry |
| Libraries | ethers.js, web3.js |
| Contract patterns | All standard EVM conventions (ERC-20, ERC-721, ERC-1155, proxies, etc.) |
| RPC interface | Most eth_* methods supported (eth_call, eth_sendRawTransaction, eth_getBalance, eth_getLogs, eth_estimateGas, etc.). For the full list, see JSON-RPC API |
What is different
1. Single-slot finality
Ethereum requires multiple block confirmations before a transaction is considered final. Stable provides single-slot finality — a transaction is final once included in a block. For developers, this means:- Once a transaction appears in a confirmed block, its state changes are final and irreversible.
- Applications can safely rely on block inclusion as confirmation of settlement.
- Verify transaction success via RPC or emitted events before proceeding with dependent actions (e.g., unlocks, redemptions).
- Implement retry and reconciliation logic for automation and batch operations to handle transient submission or RPC errors.
2. Gas token: USDT0
On Stable, transaction fees are paid in USDT0, not a volatile native token. This provides USDT-denominated, predictable low gas costs.- Users need USDT0 in their wallet to submit transactions.
- The
valuefield in transactions still works for sending USDT0, similar to how ETH is sent on Ethereum. - See USDT as Gas for details.
3. No priority tips
Stable uses a single-component gas model. There is no tip-based transaction ordering.maxPriorityFeePerGasis ignored (always 0).- Transaction ordering is not influenced by fee bidding.
- Wallets should hide or disable the priority tip input field.
- See Gas Pricing for details.
4. USDT0 dual-role behavior
USDT0 functions as both the native gas token and an ERC-20 token. This introduces behavioral differences around balance semantics, allowance safety, and certain opcode assumptions. For the full details, see USDT0 Behavior on Stable.Quick comparison
| Parameter | Stable | Ethereum |
|---|---|---|
| Gas token | USDT0 | ETH |
| Finality | Single-slot | Multi-block confirmations |
| Block time | ~0.7 seconds | ~12 seconds |
Priority tip (maxPriorityFeePerGas) | Ignored (always 0) | Used for ordering |
| EIP-1559 transaction format | Supported | Supported |
| EVM compatibility | Full | — |