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Signal Nodus EVM Balance Lookup
x402
Signal Nodus EVM Balance Lookup is a paid API for AI agents from api.signalnodus.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-12).
Returns the native token balance of an EVM wallet address at a specific block on a given chain
Price / call$0.01
Success—
StatusUnknown
How this service works
Signal Nodus: year-over-year diffs of SEC filing sections, pinned to accession numbers. The diff is the product; raw data is the on-ramp.
Output
A JSON object containing the chain name (e.g. 'base'), the block number queried ('atBlock'), and the wallet's native token balance in ETH ('balanceEth') at that point in time.
Example use cases
Historical portfolio snapshot audit
“Can you tell me how much ETH the wallet 0xdE0B295669a9FD93d5F28D9Ec85E40f4cb697BAe held on Base at block 50000000?”
DeFi liquidation threshold check
“I need to verify the ETH balance of address 0x742d35Cc6634C0532925a3b844Bc454e4438f44e on Base at block 50113122 — was it above 0.05 ETH at that point?”
On-chain wallet reconciliation
“Pull the native ETH balance for address 0xBE0eB53F46cd790Cd13851d5EFf43D12404d33E8 on Base at block 49900000 so I can reconcile it against our internal records.”
Technical details
Endpoint
GEThttps://api.signalnodus.ai/v1/evm/balance?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a point-in-time native token balance for an EVM wallet pinned to a specific block number — particularly on Base. Prefer this over generic blockchain explorers when you need machine-readable JSON output suitable for agent pipelines, or when you need sub-cent micropayment access without API key registration.
Side effects
- Invalid or malformed EVM address returns an error response
- Block number not yet mined or too far in the future returns an error
- Unsupported chain identifier results in a 400-level error
- Network congestion or node unavailability may cause timeouts
- Payment failure via x402 protocol prevents access to result
Output
Schema · Response
{
"type": "json",
"example": {
"chain": "base",
"atBlock": "50113122",
"balanceEth": 0.0421
}
}Tags
x402
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