How Solid Works (Architecture)

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, and the complexity stays under the hood.

Solid is available on the App Store and Google Play, and as a web app at app.solid.xyz.

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Solid Protocol Architecture

At a high level:

1. Users deposit USDC/USDT, and funds arrive in the Wallet first
2. Users move funds from Wallet to Savings, converting them to soUSD
3. soUSD is deployed into yield strategies
4. Yield accrues continuously
5. Users can withdraw or spend at any time

All assets remain non-custodial throughout.

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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

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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.

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Enterprise-grade asset protection

Solid uses:

• Segregated smart contracts
• Audited vaults
• Strict permissioning for strategy execution

No single party can unilaterally move user funds.

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Transparency & Contract Addresses

All core contracts are public, verifiable onchain, and documented. See the Contract Addresses article in the Security & Transparency section.

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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.