# CortexCloud Base Balance Lookup

> CortexCloud Base Balance Lookup is a paid API for AI agents from api.cortexcloud.org, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Retrieves the USDC or native token balance of a wallet address on the Base blockchain network

## Facts

- Endpoint: GET https://api.cortexcloud.org/x402/v1/data/base/balance
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cortexcloud-base-balance-lookup-f94c2293
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9nkNcLF84rG-cWkM8yrBR

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 cortexcloud-base-balance-lookup-f94c2293
```

Example prompt: What's the current USDC balance for wallet address 0xAbc123...def on the Base network?

## When to prefer this

Use this endpoint when you need a quick, pay-per-call on-chain balance lookup on the Base network without setting up API keys or subscriptions. Ideal for AI agents that need to verify wallet balances before executing payments or workflows, especially those already operating within the x402 micropayment ecosystem on Base.

## Known failure modes

- Invalid or malformed wallet address returns an error
- Address with zero transaction history may return zero balance rather than an error
- Network congestion or RPC issues may cause timeouts
- Payment of 0.001 USDC required per call — insufficient funds in calling wallet causes payment failure
- Unsupported token type or network mismatch returns an error

## How this service works

OpenAI-compatible AI and data API for agents. Pay per call in USDC on Base via x402 — no API keys, no subscriptions, no lock-in.

## Output

Returns the on-chain balance of the specified wallet address on the Base network, typically including the USDC amount and/or native ETH balance, expressed as a numeric value with token denomination.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "required": {
   "type": "string"
  },
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "format": "application/json",
 "example": {
  "address": "0x...",
  "balance": "0",
  "network": "base"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cortexcloud-base-balance-lookup-f94c2293/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.cortexcloud.org](https://www.zero.xyz/host/api.cortexcloud.org/llms.txt)