Optimism native balance

$0.003 per call · failed calls are never charged · no account or API key needed

Read the native ETH balance of any 0x address on Optimism at the latest block, in wei and in ETH. Use to check whether a wallet can pay gas or a transfer; for ERC-20 tokens use op_token_balance, for all holdings at once use wallet_portfolio. A malformed address is rejected with 400, uncharged.

Run it free (25 free calls) Buy credits by card (from $5) Example result (JSON)

Inputs

Name	Type	Description
`address` (required)	string	0x wallet or contract address

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://agent-data-tools.revmesh2074.workers.dev/op/balance?address=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"

Or one of your 25 free calls, no key:

curl "https://agent-data-tools.revmesh2074.workers.dev/op/balance?address=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum, Monad, World Chain or Tempo) and retries.

Example result

{
  "chain": "Optimism",
  "chainId": 10,
  "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
  "balanceWei": "1234500000000000000",
  "balance": "1.2345",
  "symbol": "ETH",
  "block": 123456789
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is op_balance, and the first 25 successful calls are free:

https://agent-data-tools.revmesh2074.workers.dev/mcp

Optimism native balance

Inputs

Request

Example result

From an AI agent (MCP)

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