# Balancepost — Wallet Balance on Base

> Balancepost — Wallet Balance on Base is a paid API for AI agents from oraclepost.higgsfield.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-19).

Returns live ETH and USDC balances for any Base address, read directly from the chain with no caching or third-party APIs.

## Facts

- Endpoint: GET https://oraclepost.higgsfield.app/api/balance
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/balancepost-wallet-balance-on-base-0c16001b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6aYqSETjVmgXWtezpBQ2T

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 balancepost-wallet-balance-on-base-0c16001b
```

Example prompt: What's the current ETH and USDC balance on Base for wallet address 0x4838B106FCe9647Bdf1E7877BF73cE8B0BAD5f97?

## When to prefer this

Choose this endpoint when you need a truly live, uncached, direct on-chain ETH and USDC balance for a Base address — particularly when accuracy at a specific block matters, when you distrust cached aggregators, or when you need both ETH and USDC in a single call. Prefer over third-party portfolio APIs when on-chain provenance and block-level precision are required.

## Known failure modes

- Invalid or malformed address (missing 0x prefix, wrong length) returns an error
- Address with no on-chain activity returns zero balances (not an error)
- RPC node unavailability causes request failure
- Network congestion may slightly delay block reads
- Payment of 0.001 USDC required per call via x402 protocol; missing payment results in 402 response

## How this service works

ETH and USDC balance of any address on Base, read live from the chain (eth_getBalance + USDC balanceOf) at request time. Pass ?address=0x... . Returns raw and decimal values plus the block number the read was made at. No third-party API, no cache.

## Output

Returns the ETH balance in both raw wei and decimal format, the USDC balance in both raw (6-decimal integer) and human-readable decimal format, and the block number at which the read was performed — all fetched live from the Base chain via eth_getBalance and USDC balanceOf with no caching.

## 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": {
     "const": "http"
    },
    "method": {
     "const": "GET"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "description": "EVM address on Base, 0x-prefixed, 40 hex chars"
      }
     }
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {}
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/balancepost-wallet-balance-on-base-0c16001b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from oraclepost.higgsfield.app](https://www.zero.xyz/host/oraclepost.higgsfield.app/llms.txt)