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Base ERC-20 Token Balance Lookup
x402
Base ERC-20 Token Balance Lookup is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-12).
Returns the raw and human-readable ERC-20 token balance for a given token contract and owner wallet address on Base mainnet.
Price / call$0.003
Success—
StatusUnknown
How this service works
Call when an agent needs an ERC-20 balance_raw and human balance for token and owner on Base. Example token is Circle USDC. decimals() scales the human balance. Distinct from base-balance (native ETH). Read-only. No spend. Send JSON {"token":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","owner":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"}. Exact $0.003 USDC on Base. Try unpaid POST /v1/sandbox/base-erc20-balance first.
Output
Returns a JSON object containing balance_raw (the integer token balance in the token's smallest unit) and a human-readable balance derived by dividing balance_raw by 10^decimals(), reflecting the actual token amount the owner holds on Base mainnet.
Example use cases
Portfolio USDC balance check
“Can you check how much USDC the wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 currently holds on Base? I need the actual dollar-formatted amount.”
Pre-payment eligibility verification
“Before we proceed, verify that wallet 0xAbCd1234...5678 has at least 50 USDC on Base — look up its ERC-20 balance for token 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.”
Multi-wallet token audit
“Pull the USDC balance on Base for this wallet address 0x1234...abcd using token contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, and show me both the raw wei-level value and the human-readable amount.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/base-erc20-balance?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to check an ERC-20 token balance (such as USDC) on Base mainnet specifically, and need both the raw on-chain integer value and the decimal-scaled human-readable amount. Distinct from native ETH balance lookups. Prefer this over generic blockchain RPCs when you want a simple pay-per-call API without managing RPC node infrastructure.
Side effects
- Invalid or malformed token contract address returns an error
- Invalid or malformed owner wallet address returns an error
- Token contract address that is not an ERC-20 on Base mainnet may fail or return unexpected results
- Network or RPC connectivity issues with Base mainnet may cause timeout or error
- Unpaid requests to the paid endpoint return 402 Payment Required — use sandbox endpoint first
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| owner | string | Wallet whose token balance is read. Example: 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045. EIP-55 or all one case. Returns balance_raw and a human balance from decimals(). |
| token | string | ERC-20 contract on Base mainnet. Example: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (Circle USDC). EIP-55 or all one case. Paired with owner. Distinct from base-balance, which reads native ETH. |
Tags
x402
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