# FiatDock ETH Balance on Base

> FiatDock ETH 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 ETH balance (in both wei and ETH) of any address on the Base network, with a timestamp.

## Facts

- Endpoint: POST https://fiatdock.com/v1/chain/eth-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-eth-balance-on-base-cfbaa91a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EsS_tk4Sq2Fdrr3_bCj5F

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-eth-balance-on-base-cfbaa91a -d '<json body>'
```

Example prompt: What's the current ETH balance of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base? Give me both the ETH amount and the raw wei value.

## When to prefer this

Choose this endpoint when you need a fast, pay-per-call ETH balance lookup on Base without managing your own RPC infrastructure. It's ideal for agents that need native token balance as a lightweight chain primitive — especially when already operating within the x402 payment ecosystem on Base. Prefer it over full address intelligence endpoints when you only need ETH balance and not contract metadata or USDC balance.

## Known failure modes

- Invalid or malformed Ethereum address returns an error response
- Address with zero balance returns eth: '0' and wei: '0' (not an error)
- Network connectivity issues to Base RPC may return a timeout or upstream error
- Payment failure via x402 (insufficient USDC) blocks the call before execution

## How this service works

ETH balance of any address on Base (wei + ETH). Pay-per-call via x402.

## Output

Returns a JSON object with the address's ETH balance as a decimal string (eth), the raw wei amount as a string (wei), the queried address (address), the network name (base), and an ISO 8601 timestamp (asOf) indicating when the balance was read.

## 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": {
  "eth": "1",
  "wei": "1000000000000000000",
  "asOf": "2026-07-30T00:00:00.000Z",
  "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "network": "base"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fiatdock-eth-balance-on-base-cfbaa91a/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)