# FiatDock USDC Balance on Base

> FiatDock USDC Balance on Base is a paid API for AI agents from fiatdock.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Returns the USDC balance of any Base network address in both human-readable USDC units and atomic (raw) form.

## Facts

- Endpoint: POST https://fiatdock.com/v1/chain/usdc-balance
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fiatdock-usdc-balance-on-base-02ee3286
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fK7xQ94Hd8WPrJDNHvaA1

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 fiatdock-usdc-balance-on-base-02ee3286 -d '<json body>'
```

Example prompt: What's the current USDC balance for the Base address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 — give me both the human-readable amount and the raw atomic value?

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call USDC balance check specifically on the Base network without setting up a full RPC node or indexer. It is ideal for AI agents and automation workflows that need atomic-precision USDC amounts for settlement verification, pre-payment checks, or portfolio monitoring on Base, and where the x402 micropayment model fits the cost structure.

## Known failure modes

- Invalid or malformed Base address returns an error response
- Address not found or zero balance returns atomic: '0' and usdc: '0'
- Network congestion may cause slightly stale balance data
- Pay-per-call x402 payment failure blocks the request
- Rate limiting if called too rapidly without valid micropayments

## How this service works

USDC balance of any address on Base — the x402 settlement asset (atomic + USDC). Pay-per-call via x402.

## Output

Returns a JSON object containing: the USDC balance as a decimal string (e.g. '1'), the raw atomic balance as an integer string (e.g. '1000000' for 6 decimals), the asset symbol ('USDC'), the network identifier ('base'), the queried address, the USDC contract address on Base, and an ISO 8601 timestamp (asOf) indicating when the balance was fetched.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "address": {
   "type": "string",
   "description": "A 40-hex EVM address (0x…)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "asOf": "2026-07-30T00:00:00.000Z",
  "usdc": "1",
  "asset": "USDC",
  "atomic": "1000000",
  "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "network": "base",
  "contract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fiatdock-usdc-balance-on-base-02ee3286/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fiatdock.com](https://www.zero.xyz/host/fiatdock.com/llms.txt)