Solid under the hood
Solid is built on modern Ethereum infrastructure and the Fuse ecosystem, combining:
ERC-4626 vaults
Safe smart accounts
MPC key management
Gasless transactions (paymaster)
Users interact with a simple interface — the complexity stays under the hood.
Solid is currently available as a web app at app.solid.xyz. A mobile app is coming soon.
Solid Protocol Architecture
At a high level:
Users deposit USDC/USDT — funds arrive in the Wallet first
Users move funds from Wallet to Savings, converting them to soUSD
soUSD is deployed into yield strategies
Yield accrues continuously
Users can withdraw or spend at any time
All assets remain non-custodial throughout.
How soUSD works
soUSD is an ERC-4626-compatible yield token.
Instead of your balance increasing in tokens, the value of each soUSD increases over time, reflecting earned yield.
This makes soUSD:
Simple to track
Efficient for spending
Compatible with DeFi standards
How soUSD generates yield
soUSD earns yield through curated, conservative DeFi strategies, such as:
Lending markets
Liquid yield vaults
Risk-managed stablecoin strategies
Strategies are selected for capital efficiency, liquidity, and security — not maximum APY at all costs.
Enterprise-grade asset protection
Solid uses:
Segregated smart contracts
Audited vaults
Strict permissioning for strategy execution
No single party can unilaterally move user funds.
Transparency & Contract Addresses
All core contracts are public, verifiable onchain, and documented. See the Contract Addresses article in the Security & Transparency section.
Risk Disclosure
Solid is built to minimize risk, but all DeFi carries risk, including:
Smart contract risk
Strategy risk
Liquidity risk
Solid does not guarantee profits or principal.