# bal-check Base ETH+USDC Balance Lookup

> bal-check Base ETH+USDC Balance Lookup is a paid API for AI agents from bal-check.restockalarm.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-29).

Returns the ETH and USDC balances of a given EVM wallet address on the Base blockchain

## Facts

- Endpoint: GET https://bal-check.restockalarm.workers.dev/v1/balance?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/bal-check-base-eth-usdc-balance-lookup-37c66671
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_O5DWBJxVbBPX45IqXQyjd

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 bal-check-base-eth-usdc-balance-lookup-37c66671
```

Example prompt: Can you check the ETH and USDC balances for the wallet address 0x7B97... on Base?

## When to prefer this

Choose this endpoint when you need a quick, cheap ($0.003 USDC) on-chain balance lookup for both ETH and USDC on the Base network for any EVM address, without needing to run your own RPC node or integrate a heavier blockchain data provider. Ideal for lightweight agent workflows checking wallet liquidity before transactions or monitoring balances.

## Known failure modes

- Missing or invalid address parameter returns an error
- Non-0x-prefixed or malformed address may cause a validation error
- Payment failure (insufficient USDC on Base for the $0.003 x402 fee) blocks the request
- Address exists but has zero balances — returns 0 for both eth and usdc
- Network or RPC errors on Base may cause transient failures

## How this service works

Base ETH+USDC balance. Pay $0.003 USDC on Base via x402.

## Output

A JSON object containing the ETH balance as a decimal string, the USDC balance as a decimal string, the chain identifier ('base'), and the queried wallet address — e.g. {"eth":"0.01","usdc":"12.5","chain":"base","address":"0x7B97…"}.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "description": "0x-prefixed EVM address"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "eth": "0.01",
  "usdc": "12.5",
  "chain": "base",
  "address": "0x7B97…"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/bal-check-base-eth-usdc-balance-lookup-37c66671/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bal-check.restockalarm.workers.dev](https://www.zero.xyz/host/bal-check.restockalarm.workers.dev/llms.txt)