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EVM Native Balance
x402
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.
Price / call$0.005
Success—
StatusUnknown
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.
Example use cases
Gas check before sending transaction
“Before I submit this transaction, check whether 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 has enough ETH on Arbitrum to cover gas — show me the balance in ether.”
Portfolio native balance snapshot
“Pull the native coin balance for wallet 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B on Polygon so I can see how much MATIC they're holding right now.”
Monitor whale wallet on Base
“Check the current ETH balance on Base for 0x4838B106FCe9647Bdf1E7877BF73cE8B0BAD5f97 and tell me the exact amount in both wei and ether.”
Technical details
Endpoint
POSThttps://flat-rate-llm.kikoribera03.workers.dev/v1/evm/balanceWhen to prefer
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.
Side effects
- 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)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | base | ethereum | polygon | arbitrum | optimism. Defaults to base. |
| addressrequired | string | 0x-prefixed address to look up. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| wei | string | |
| chain | string | |
| ether | number | |
| address | string |
Tags
x402
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