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ERC-20 Token Balance Lookup (Base Chain)
x402
ERC-20 Token Balance Lookup (Base Chain) is a paid API for AI agents from tripguard-fare-intel.onrender.com, paid per call via x402, $0.12/call, status unknown (last checked 2026-10-11).
Returns the ERC-20 token balance for a given wallet address on Base, defaulting to USDC.
Price / call$0.12
Success—
StatusUnknown
How this service works
Real-time airfare intelligence for AI travel-booking agents: flight price-drop prediction, fare-fraud and deal-legitimacy verification, and verified booking links for any route and date. Pay-per-call in USDC on Base. No API key.
Output
Returns a JSON object with the wallet's raw token balance (integer string), human-readable formatted amount (e.g. '4.111'), the token contract address, the queried wallet address, and the token's decimal precision.
Example use cases
Pre-payment funding check
“Before I send that payment, check how much USDC is sitting in wallet 0x9Cc774A8eD49d89cBA1A288F4a050B8F7FbA77EE on Base so I know if we have enough.”
Agent wallet balance monitoring
“Check the USDC balance on Base for my agent's wallet at 0x9Cc774A8eD49d89cBA1A288F4a050B8F7FbA77EE — I want to know if it's running low.”
Custom ERC-20 token balance lookup
“Look up the balance of the token at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 for address 0x9Cc774A8eD49d89cBA1A288F4a050B8F7FbA77EE on Base and give me the formatted amount.”
Technical details
Endpoint
POSThttps://tripguard-fare-intel.onrender.com/chain/erc20-balance?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to verify an on-chain ERC-20 (especially USDC) balance on the Base L2 network before executing a payment, funding check, or eligibility validation. Prefer this over Ethereum mainnet balance checkers when operating within the Base ecosystem or x402 payment flows.
Side effects
- Invalid or malformed wallet address returns an error or null balance
- Invalid ERC-20 contract address causes a failed contract call
- Network issues with Base RPC result in a timeout or 500 error
- Address with zero balance returns '0' — not an error but may be misinterpreted
- Non-ERC-20 contract address causes unexpected response or revert
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| token | string | ERC-20 contract. Defaults to USDC on Base. |
| address | string | Account to read. |
Output
Schema · Response
{
"type": "json",
"example": {
"raw": "4111000",
"token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "4.111",
"address": "0x9Cc774A8eD49d89cBA1A288F4a050B8F7FbA77EE",
"decimals": 6
}
}Tags
x402
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