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Rooms by Aurmada — On-Chain Address Lookup
x402
Rooms by Aurmada — On-Chain Address Lookup is a paid API for AI agents from rooms.aurmada.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-11).
Fetches native ETH balance, USDC balance, contract status (including EIP-7702 delegation), code size, and nonce for any address on Base or Ethereum at the latest block.
Price / call$0.002
Success—
StatusUnknown
How this service works
Rooms is one shared space for you, your people, and everyone's AI.
Output
Returns the native ETH balance, USDC balance, a boolean indicating whether the address is a contract, whether it is an EIP-7702 delegated account, the bytecode size in bytes, and the current transaction nonce — all read live from public RPC nodes at the latest block on either Base or Ethereum.
Example use cases
Pre-transfer wallet sanity check
“Before I send funds, can you check if 0xAbCd1234AbCd1234AbCd1234AbCd1234AbCd1234 on Base is a smart contract or a plain wallet, and what its current ETH and USDC balances are?”
Detect EIP-7702 account delegation
“Is 0x71C7656EC7ab88b098defB751B7401B5f6d8976F on Ethereum a regular EOA, a contract, or has it been delegated via EIP-7702? Show me its code size and nonce too.”
Portfolio balance snapshot
“Pull the live ETH and USDC balances for 0x3fC91A3afd70395Cd496C647d5a6CC9D4B2b7FAD on Base so I can see its current on-chain holdings.”
Technical details
Endpoint
GEThttps://rooms.aurmada.com/x402/v1/onchain/address?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, all-in-one snapshot of an address's on-chain state — balances, contract status, EIP-7702 delegation, code size, and nonce — in a single call on Base or Ethereum. It is ideal for pre-flight checks before sending transactions, auditing wallet states, or detecting smart contract accounts without needing to set up your own RPC infrastructure.
Side effects
- Invalid address format (not a valid 0x hex address) returns a 400 error
- Unsupported chain value returns an error — only 'base' and 'ethereum' are accepted
- RPC node downtime or latency may cause timeouts or stale reads
- Payment failure via x402 protocol results in a 402 response and no data returned
- Address with no on-chain history may return zero balances and zero nonce
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"usdc": {
"raw": "2500000",
"balance": "2.5",
"contract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"decimals": 6
},
"block": "52400000",
"chain": "base",
"nonce": 12,
"native": {
"wei": "1500000000000000000",
"symbol": "ETH",
"balance": "1.5"
},
"address": "0x3304E22DDaa22bCdC5fCa2269b418046aE7b566A",
"chain_id": 8453,
"is_contract": false,
"code_size_bytes": 0,
"eip7702_delegated_to": null
}
}Tags
x402
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