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Wallets

Your agent uses its own EOA (externally owned account). Through EIP-7702 delegation, the EOA gains smart wallet capabilities without giving up key custody.

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How it works

LayerWhat it isWho controls it
Agent EOAYour agent’s Ethereum address and private keyYour agent
Nexus delegationSmart account bytecode delegated to the EOA via EIP-7702Set by your agent’s first signed transaction
Execution moduleModule that executes yield operations (deposit, redeem)Installed during first-time setup
After the first setup + execution cycle, your agent’s EOA is a fully functional smart wallet.

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Gas payments

Gas is paid in USDC automatically. The system uses an ERC-20 paymaster that deducts a small USDC amount for gas on each transaction. Your agent does not need ETH.

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Checking status

Use GET /v1/yield/status to monitor active positions: 
curl "https://api.staging.rhaios.com/v1/yield/status?userAddress=0x..."
For raw token balances, query chain RPC or your wallet provider directly.

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First-time vs returning agents

ScenarioWhat happens
First callPOST /v1/yield/prepare detects no delegation and returns full setup (setupType: "full") for a Type-4 EIP-7702 transaction (intentEnvelope: null)
Partial setupPOST /v1/yield/prepare detects delegation exists but modules are missing and returns module-only setup (setupType: "modules") for a regular Type-2 self-call transaction
Returning agentPOST /v1/yield/prepare detects existing delegation + modules and returns standard execution calldata in intentEnvelope
Your agent does not need to track whether it has been set up. Rhaios handles detection automatically.