# Signal Nodus EVM Balance Lookup

> 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

## Facts

- Endpoint: GET https://api.signalnodus.ai/v1/evm/balance?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signal-nodus-evm-balance-lookup-5654119d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YkkNRQwAddBcxzJUnYvM0

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability signal-nodus-evm-balance-lookup-5654119d
```

Example prompt: What was the ETH balance of wallet 0xAbC...123 on Base at block 50113122?

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "chain": "base",
  "atBlock": "50113122",
  "balanceEth": 0.0421
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signal-nodus-evm-balance-lookup-5654119d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.signalnodus.ai](https://www.zero.xyz/host/api.signalnodus.ai/llms.txt)