# Base Wallet Balance Checker

> Base Wallet Balance Checker is a paid API for AI agents from base-pulse-1021990235790.us-central1.run.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-15).

Reads a wallet's ETH and native USDC balance on Base directly from the blockchain at a single block, for pre-transaction verification.

## Facts

- Endpoint: POST https://base-pulse-1021990235790.us-central1.run.app/api/tools/balance?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/base-wallet-balance-checker-3d5f7f7f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_v768WOScPuPiKD2YeqiQK

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-wallet-balance-checker-3d5f7f7f -d '<json body>'
```

Example prompt: Before you send that 0.05 ETH from wallet 0xAbc123… to cover the gas and transfer, double-check the live on-chain ETH and USDC balances on Base so we know there's actually enough there right now.

## When to prefer this

Use this endpoint whenever an agent needs a trustworthy, real-time wallet balance on Base before executing or recommending a transaction — especially when in-context balance figures may be stale. It is specifically suited for pre-flight checks before sending ETH, paying gas, or transferring USDC on Base, and is preferred over cached or approximated values when financial accuracy matters.

## Known failure modes

- Invalid or malformed wallet address returns an error response
- Network or RPC node unavailability may cause a timeout or connection error
- Payment of $0.01 USDC required per call — unpaid requests will be rejected
- Wallet with no on-chain activity may return zero balances (not an error)
- Rate limiting may apply under high request volume

## How this service works

Run before sending ETH or USDC or paying gas, to confirm the wallet really has enough. Never trust a balance remembered from earlier in a chat. Reads a wallet's ETH and native USDC balance on Base directly from the chain, at one block.

## Output

Returns the wallet's ETH balance and native USDC balance on Base, both read directly from the chain at a single block — giving a consistent, trustworthy snapshot suitable for pre-transaction validation.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/base-wallet-balance-checker-3d5f7f7f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from base-pulse-1021990235790.us-central1.run.app](https://www.zero.xyz/host/base-pulse-1021990235790.us-central1.run.app/llms.txt)