# EVM Native Balance

> EVM Native Balance is a paid API for AI agents from flat-rate-llm.kikoribera03.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).

Returns the native coin balance (ETH, MATIC, etc.) for any EVM address on Base, Ethereum, Polygon, Arbitrum, or Optimism via eth_getBalance.

## Facts

- Endpoint: POST https://flat-rate-llm.kikoribera03.workers.dev/v1/evm/balance
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/evm-native-balance-ce33d140
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pdYF30L6_ZyAd1P_x5tbs

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 evm-native-balance-ce33d140 -d '<json body>'
```

Example prompt: What's the current ETH balance of 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Ethereum mainnet — give me both the wei amount and the ether value?

## When to prefer this

Choose this endpoint when you need a quick, flat-rate native coin balance lookup across the five major EVM chains (Base, Ethereum, Polygon, Arbitrum, Optimism) without setting up API keys or worrying about rate limits. It is ideal for agents that need to check gas availability, monitor wallet balances, or enrich on-chain data cheaply at $0.001 per call. Prefer alternatives if you need ERC20 token balances (use the ERC20 token info sibling) or balances across many chains not in the supported set.

## Known failure modes

- Invalid or malformed Ethereum address returns an error response
- Unsupported chain identifier results in a 400 or error payload
- RPC node for the requested chain is temporarily unavailable, causing a timeout or 5xx error
- Payment (x402) not provided or insufficient funds returns a 402 Payment Required response
- Address with zero balance returns wei: '0' and ether: 0 (not an error, but may be unexpected)

## How this service works

60 paid endpoints with no metering, no API key and no account. Each endpoint has one flat price per call, whatever the size of the request: LLM completions with automatic failover across several large models, read-only EVM tooling over Base, Ethereum, Polygon, Arbitrum and Optimism, and pure crypto utilities that touch no network.

## Output

A JSON object containing the queried address, the chain identifier in CAIP-2 format (e.g. eip155:8453), the balance expressed as a string in wei, and the balance as a floating-point number in ether units.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "address"
 ],
 "properties": {
  "chain": {
   "type": "string",
   "description": "base | ethereum | polygon | arbitrum | optimism. Defaults to base."
  },
  "address": {
   "type": "string",
   "description": "0x-prefixed address to look up."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "wei": {
   "type": "string"
  },
  "chain": {
   "type": "string"
  },
  "ether": {
   "type": "number"
  },
  "address": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/evm-native-balance-ce33d140/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from flat-rate-llm.kikoribera03.workers.dev](https://www.zero.xyz/host/flat-rate-llm.kikoribera03.workers.dev/llms.txt)