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Wallet Profile Lookup API (x402)
x402
Wallet Profile Lookup API (x402) is a paid API for AI agents from freetier-agent-api.pages.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-30).
Returns on-chain wallet or contract profile data including ETH balance, token balances, nonce, and account type for a given address on Base or Ethereum.
Price / call$0.005
Success—
StatusUnknown
How this service works
Invoice-to-JSON, on-chain tools (transaction explainer + payment check, wallet profile, contract ABI, ERC-20 token risk), company contacts and web-to-RAG for AI agents. Pay per call with x402 (USDC on Base). No signup, no API key.
Output
A JSON object containing the account type (EOA or contract), chain, address, nonce, ETH balance as a string, and an array of token balances each with symbol and balance amount.
Example use cases
DeFi portfolio snapshot for a wallet
“Show me everything this wallet holds on Base — ETH balance, any ERC-20 tokens like USDC or WETH, and tell me if it's a regular wallet or a smart contract. The address is 0x1234567890abcdef1234567890abcdef12345678.”
Verify wallet activity before a transaction
“Before I send funds, can you check the nonce and ETH balance for 0xDeAdBeEf0000000000000000000000000000dEaD on Ethereum so I know it's an active wallet?”
Identify whether an address is a contract
“I have this address 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum — is it a smart contract or a regular EOA, and what's its current ETH and token balance?”
Technical details
Endpoint
GEThttps://freetier-agent-api.pages.dev/api/wallet-profile?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, no-signup on-chain wallet profile including balance and account type for Base or Ethereum, and you want to pay per call with USDC via x402 rather than managing API keys or subscriptions.
Side effects
- Invalid or malformed address format returns an error
- Unsupported chain value returns a validation error
- Address not found or zero activity may return empty balances
- Payment not fulfilled via x402 returns HTTP 402
- Network or RPC timeout may cause delayed or failed response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"type": "eoa",
"chain": "base",
"nonce": 42,
"address": "0x...",
"ethBalance": "0.0123",
"tokenBalances": [
{
"symbol": "USDC",
"balance": "12.5"
}
]
}
}Tags
x402
Reviews
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