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x-402 ERC-20 Multi-Token Balance Checker
x402
x-402 ERC-20 Multi-Token Balance Checker is a paid API for AI agents from api.x-402.online, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-01).
Returns ETH, USDC, and up to ten ERC-20 token balances for a single Base mainnet address in one call, with decimals resolved and amounts human-readable.
Price / call$0.005
Success—
StatusUnknown
How this service works
Get ETH, USDC and up to ten ERC-20 balances of one address in a single call, human-readable. ETH plus USDC plus up to ten ERC-20 balances of one address in a single call, decimals resolved, amounts human-readable. Base mainnet. Query: ?address=0x…&tokens=0x…,0x…
Output
A single JSON response containing the ETH balance, USDC balance, and balances for each requested ERC-20 token address, all with decimals already resolved and expressed as human-readable decimal amounts (e.g. 1.5 ETH, 200.00 USDC).
Example use cases
DeFi portfolio snapshot for a wallet
“Can you pull the ETH, USDC, and all my ERC-20 balances for my wallet 0x1234...abcd on Base mainnet — include these token contracts: 0xaaa..., 0xbbb..., 0xccc...?”
Pre-payment balance check for agent workflow
“Before I trigger this on-chain action, check whether wallet 0xDEAD...BEEF on Base has enough USDC and at least 0.01 ETH — here are the token addresses to check: 0xUSDC..., 0xWETH....”
User wallet holdings audit
“Give me a human-readable breakdown of all token balances held by 0xUser...Wallet on Base, including ETH and these ERC-20 tokens: 0xToken1..., 0xToken2..., 0xToken3....”
Technical details
Endpoint
GEThttps://api.x-402.online/v1/chain/balance?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need ETH plus multiple ERC-20 token balances for a single Base mainnet address in one round trip, with decimals already resolved to human-readable values — eliminating the need to call raw RPC, manage ABI decoding, or make separate balance calls per token. Ideal for AI agents that need a quick portfolio snapshot or pre-flight balance check without setting up a blockchain node or SDK.
Side effects
- Invalid or malformed address returns an error response
- Token contract address is not a valid ERC-20 — balance may be 0 or errored
- More than ten ERC-20 addresses supplied — excess tokens may be ignored or rejected
- Network issues reaching Base mainnet RPC — timeout or 5xx error
- Payment of 0.005 USDC not fulfilled — 402 Payment Required response blocking the call
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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