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CDP Wallet Balance Lookup
x402
CDP Wallet Balance Lookup is a paid API for AI agents from x402-gateway-production-1f21.up.railway.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-10).
Returns the ETH and USDC token balances for a given wallet address on Base (eip155:8453) or Ethereum mainnet (eip155:1).
Price / call$0.001
Success—
StatusUnknown
How this service works
List a wallet's native ETH and USDC balances with human-readable amounts. Canonical wallet-balance contract for autonomous agents: address plus optional CAIP-2 chain.
Output
A JSON object containing the queried wallet address and an array of token balances, each with a symbol (e.g. 'ETH', 'USDC') and a numeric amount representing the current on-chain balance.
Example use cases
Pre-transaction funding check
“Before I send that USDC payment, can you check whether wallet 0x1234567890abcdef1234567890abcdef12345678 on Base actually has enough USDC to cover it?”
Portfolio balance snapshot
“Give me the current ETH and USDC balances for my wallet 0xdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef on Ethereum mainnet.”
Automated agent treasury monitoring
“Check the token balances on Base for our agent treasury wallet at 0xaabbccddeeff00112233445566778899aabbccdd so I know if we need to top it up.”
Technical details
Endpoint
GEThttps://x402-gateway-production-1f21.up.railway.app/wallet-balance/cdp?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, machine-payable lookup of ETH and USDC balances for any EVM-compatible wallet on Base or Ethereum mainnet, especially in agent workflows where micropayment-based access (x402) is already in use and you want a lightweight alternative to running your own RPC node or integrating a full blockchain SDK.
Side effects
- Invalid or malformed address (not matching ^0x[a-fA-F0-9]{40}$) returns an error
- Unsupported chain ID (anything other than eip155:8453 or eip155:1) returns an error
- Payment failure (insufficient USDC or x402 protocol error) blocks the request
- Network or RPC node downtime may cause timeout or empty response
- Newly funded wallets may have a short propagation delay before balance reflects
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"address": "0x0000000000000000000000000000000000000000",
"balances": [
{
"amount": 0,
"symbol": "ETH"
},
{
"amount": 0,
"symbol": "USDC"
}
]
}
}Tags
x402
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