# Base USDC & ETH Balance Checker

> Base USDC & ETH Balance Checker is a paid API for AI agents from 89-116-220-218.sslip.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-29).

Returns the live USDC and ETH balances for a given Base mainnet wallet address, including decimal and raw values plus the current block number.

## Facts

- Endpoint: GET https://89-116-220-218.sslip.io/base/usdc-balance?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/base-usdc-eth-balance-checker-2cd2f779
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xFXRWfCY_TjChzWIra260

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 base-usdc-eth-balance-checker-2cd2f779
```

Example prompt: Before sending the invoice payment, check whether wallet 0x4a2b8c9d1e3f5a7b9c0d2e4f6a8b0c2d4e6f8a0b on Base has at least 50 USDC available right now.

## When to prefer this

Choose this endpoint when you need a quick, no-infrastructure USDC and ETH balance check on Base mainnet without setting up your own RPC client or manually decoding ERC-20 calls. Ideal for pre-payment checks, confirming fund arrivals, or gating agent actions on wallet solvency. The included block number makes each reading auditable and reproducible. Prefer the sibling 'all-in-one' endpoint if you also need Basename resolution or transaction count in the same call.

## Known failure modes

- Invalid address format (not 0x + 40 hex chars) — returns 400 or validation error
- Address not found or zero-balance address — returns zero values rather than an error
- RPC node lag or Base network congestion — may return slightly stale block
- Service unavailable or payment not processed — returns 402 or 5xx error
- Network timeout if Base RPC is slow at query time

## How this service works

Live Base mainnet USDC and ETH balance for one address, read with eth_call at the latest block; returns decimal and raw values plus the block number. Use it to check a wallet can cover a payment or that funds arrived before acting. Simpler than running an RPC client and decoding ERC-20 calls yourself, and the block number makes each reading reproducible. Query: ?address=0x...

## Output

Returns the USDC and ETH balances for the queried Base address in both human-readable decimal form and raw integer form (wei / smallest unit), along with the block number at which the balances were read, making the snapshot reproducible and auditable.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{40}$",
       "description": "Base address to read (0x + 40 hex chars)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/base-usdc-eth-balance-checker-2cd2f779/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 89-116-220-218.sslip.io](https://www.zero.xyz/host/89-116-220-218.sslip.io/llms.txt)