> ## Documentation Index
> Fetch the complete documentation index at: https://docs.railnet.org/llms.txt
> Use this file to discover all available pages before exploring further.
# Supported protocols
> All DeFi protocols supported by Railnet — native adapters and ERC-4626 compatible vaults
In Railnet smart contracts, a Yield Source is connected via a **Vehicle** adapter. See [Glossary](/developers/glossary) for all terminology.
Railnet connects to DeFi protocols through Vehicle adapters. Some protocols have **native adapters** built into the protocol. Any protocol exposing an ERC-4626 vault can be connected through the **generic ERC-4626 Vehicle** without custom code.
## Vault standards
Railnet supports multiple vault standards through its Vehicle abstraction layer. A "supported" standard means Railnet ships a base Vehicle implementation that handles the standard's mechanics — you inherit from it, and Railnet handles the STEAM lifecycle, accounting, and keeper automation.
**ERC-4626 (synchronous vaults).** The most common DeFi vault standard. ERC-4626 vaults have immediate deposits and withdrawals, making them the simplest integration path. Railnet wraps these with sync Vehicles.
**ERC-7540 (asynchronous vaults).** The emerging standard for vaults with delayed operations — withdrawal queues, cooldown periods, and multi-step settlement. Railnet wraps these with async Vehicles and automates settlement via keepers. The same async state machine handles off-chain settlement for real-world assets, so tokenized treasuries, private credit, and trade finance integrate through the same Vehicle model as on-chain protocols.
## Native Vehicle adapters
These protocols have dedicated Vehicle implementations in the Railnet codebase, optimized for each protocol's specific mechanics.
| Protocol | Vehicle type | Deposits | Withdrawals | Factory (Base Testnet) |
| --------------------- | ------------------- | -------- | ---------------- | -------------------------------------------- |
| Aave V3 | `AaveV3Vehicle` | Sync | Sync | `0x414A9F508044B914243e91a421bf2F7D599aDc78` |
| Compound V3 | `CompoundV3Vehicle` | Sync | Sync | `0x33450Ec8C1b1BEbD4eEe39714b5C0e18b90d0f33` |
| Morpho Blue | `MorphoBlueVehicle` | Sync | Sync | `0x305844AD370e202e534c80b14c2a03e00369267d` |
| Any ERC-4626 vault | `ERC4626Vehicle` | Sync | Sync | `0x75074d971c62B82BA8baf316dE5c4E17eBbe9cb5` |
| Ethena (sUSDe) | `EthenaVehicle` | Sync | Async (cooldown) | — |
| Syrup (Maple Finance) | `SyrupVehicle` | Sync | Async (queue) | — |
Factory addresses shown are for **Base Testnet** (chain ID 8453). Mainnet addresses will be added here as deployments are finalized. Ethena and Syrup factories are not yet deployed on testnet.
Railnet also includes a **Wrapper Vehicle** (`WrapperVehicleFactory: 0x7567FA3332a284A96b936ed8F756F03799885EC5`) that provides a 1:1 wrap of any ERC-20 token for STEAM compatibility. This is a utility adapter — it does not generate yield.
## ERC-4626 compatible protocols
Any protocol that exposes an [ERC-4626](https://eips.ethereum.org/EIPS/eip-4626) tokenized vault can be connected to Railnet using the generic `ERC4626Vehicle` — no custom adapter code required. The following protocols are known to implement ERC-4626 and are theoretically compatible.
### Lending
| Protocol | Example vaults | Notes |
| -------------------------- | -------------------------------- | -------------------------------------------------- |
| Morpho Vaults (MetaMorpho) | USDC, WETH, wstETH vaults | Curated lending vaults built on Morpho Blue |
| Yearn V3 | V3 vaults across multiple assets | All Yearn V3 vaults are ERC-4626 native |
| Euler V2 | Lending and borrowing vaults | Modular lending with ERC-4626 vault interface |
| Spark (Sky/MakerDAO) | sDAI | DAI Savings Rate vault |
| Gearbox | Passive lending pools | ERC-4626 pools for lending to leveraged strategies |
| Silo V2 | Isolated lending markets | Risk-isolated lending with ERC-4626 shares |
| Fluid (Instadapp) | fTokens (fUSDC, fETH) | Lending layer with ERC-4626 deposit tokens |
| Sturdy Finance | Aggregated yield vaults | Yield aggregation on top of lending protocols |
### Yield aggregators
| Protocol | Example vaults | Notes |
| -------------- | ------------------------ | ----------------------------------- |
| Sommelier | Cellar vaults | Actively managed strategy vaults |
| Mellow Finance | LRT and restaking vaults | Permissionless vault infrastructure |
### Staking and liquid staking
| Protocol | Example vaults | Notes |
| --------------- | ---------------------- | -------------------------------------------------- |
| Origin Protocol | wOETH, wOUSD | ERC-4626 wrapped yield-bearing stablecoins and ETH |
| Frax Finance | sFRAX, sfrxETH | Staked FRAX and staked frxETH |
| Angle Protocol | Savings vaults (stEUR) | Euro and multi-currency savings vaults |
### Real-world assets
| Protocol | Example vaults | Notes |
| ----------------- | -------------- | ------------------------------------------ |
| Ondo Finance | OUSG, USDY | Tokenized US Treasuries and yield notes |
| Mountain Protocol | wUSDM | Yield-bearing stablecoin backed by T-bills |
| Backed Finance | bIB01, bCSPX | Tokenized ETFs and bonds |
| Centrifuge | Pool tokens | Tokenized real-world credit |
| OpenEden | TBILL | Tokenized T-bill vault |
| Superstate | USTB | Tokenized short-term government bonds |
This list is not exhaustive. Any vault implementing the ERC-4626 standard can be connected using the generic `ERC4626Vehicle`. Check a protocol's documentation to verify ERC-4626 compatibility before deploying.
## Custom adapter candidates
Some protocols require async handling (withdrawal queues, cooldown periods, or per-address restrictions) and cannot use the generic ERC-4626 Vehicle. These protocols can be supported by building a [custom async adapter](/developers/vehicles/build-custom-adapter), following the same pattern as the native Ethena and Syrup Vehicles.
| Protocol | Category | Async pattern |
| ------------------ | ------------------ | ------------------------- |
| Lido (wstETH) | Liquid staking | Withdrawal queue |
| Rocket Pool (rETH) | Liquid staking | Minipool exit queue |
| EigenLayer | Restaking | Withdrawal delay |
| Symbiotic | Restaking | Withdrawal delay |
| Karak | Restaking | Withdrawal delay |
| Pendle | Yield tokenization | Maturity-based settlement |
***
Deploy a Vehicle that wraps any ERC-4626 vault — the plug-and-play integration path.
Handle withdrawal delays and per-address restrictions with the async adapter pattern.