Base Mainnet ETH Balance Lookup

x402

Base Mainnet ETH Balance Lookup is a paid API for AI agents from x402-data-api.sigrunner.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-16).

Returns the ETH balance (in ETH and USD) for a given Base mainnet wallet address.

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

ETH balance of a Base mainnet address, incl. balance_usd.

Output

Returns the ETH balance of the specified Base mainnet address as a numeric value, along with its equivalent in USD (balance_usd), enabling quick assessment of a wallet's ETH holdings in both native and fiat terms.

Example use cases

Example prompt

“What's the current ETH balance (and its USD value) for the Base mainnet wallet 0x4838B106FCe9647Bdf1E7877BF73cE8B0BAD5f97?”

Technical details

Endpoint

GEThttps://x402-data-api.sigrunner.workers.dev/chain/balance

When to prefer

Use this endpoint when you specifically need the native ETH balance of a Base mainnet address expressed in both ETH and USD, and don't need token balances, transaction counts, or contract checks. For a fuller wallet overview, prefer the wallet bundle endpoint. For ERC-20 token balances, use the dedicated token balance endpoint.

Side effects

Missing or malformed address query param — returns error or empty result
Address not found on Base mainnet (valid format but zero balance — returns 0)
Invalid 0x address format — returns validation error
Network/RPC timeout — returns 5xx or gateway error
Payment not processed (x402 micropayment failure) — returns 402

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "chain": "base",
    "address": "0x4200000000000000000000000000000000000006",
    "balance_eth": 17.2654321,
    "balance_usd": 31886.15,
    "balance_wei": "17265432100000000000"
  }
}

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Technical details

Endpoint

GEThttps://x402-data-api.sigrunner.workers.dev/chain/balance

When to prefer

Side effects

Missing or malformed address query param — returns error or empty result
Address not found on Base mainnet (valid format but zero balance — returns 0)
Invalid 0x address format — returns validation error
Network/RPC timeout — returns 5xx or gateway error
Payment not processed (x402 micropayment failure) — returns 402

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "chain": "base",
    "address": "0x4200000000000000000000000000000000000006",
    "balance_eth": 17.2654321,
    "balance_usd": 31886.15,
    "balance_wei": "17265432100000000000"
  }
}