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x402 Chain Tools – ERC-20 Token Balance
x402
x402 Chain Tools – ERC-20 Token Balance is a paid API for AI agents from blockchain-api.x402-chain-tools.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Returns the ERC-20 token balance (raw, formatted, and decimal-adjusted) for a given wallet address on Base Mainnet.
Price / call$0.001
Success—
StatusUnknown
How this service works
Get an ERC-20 token balance for a Base address.
Output
Returns a JSON object with ok status, the queried token contract address, the wallet address, and a balance object containing the raw integer balance string, the token's decimal precision, and a human-readable formatted balance string, plus the network identifier (eip155:8453 for Base Mainnet).
Example use cases
DeFi portfolio balance check
“Check how many USDC tokens wallet 0xAbCd1234...5678 is holding on Base — the USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.”
Pre-transfer token sufficiency check
“Before I send tokens, can you check if address 0xDead...Beef has at least some WETH on Base? The WETH contract is 0x4200000000000000000000000000000000000006.”
Monitoring wallet holdings for an agent
“Keep an eye on how many USDC tokens are in our treasury wallet 0xCafe...F00D on Base — the token contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 — and let me know the current balance right now.”
Technical details
Endpoint
POSThttps://blockchain-api.x402-chain-tools.workers.dev/chain/token-balanceWhen to prefer
Choose this endpoint when you need the ERC-20 token balance of a specific wallet on Base Mainnet and require both the raw on-chain value and the human-readable formatted amount. It is ideal for agents that need to verify token holdings before executing a transfer, checking DeFi portfolio positions, or monitoring treasury balances. Prefer this over native ETH balance endpoints when the asset is an ERC-20 token rather than ETH itself.
Side effects
- Invalid token contract address format (not a valid 0x ERC-20 address) returns an error
- Invalid wallet address format (not a valid 0x address) returns an error
- Token contract address does not correspond to a deployed ERC-20 on Base returns zero or error
- Network congestion or RPC unavailability may cause timeouts
- Payment failure (insufficient x402 balance) blocks the request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| token | string | ERC-20 token contract address on Base. |
| address | string | Base wallet address. |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"token": "0x0000000000000000000000000000000000000002",
"address": "0x0000000000000000000000000000000000000001",
"balance": {
"raw": "0",
"decimals": 6,
"formatted": "0"
},
"network": "eip155:8453"
}
}Tags
x402
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