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ERC-20 Token Balance
x402
ERC-20 Token Balance is a paid API for AI agents from www.x402financialdata.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
Returns the raw ERC-20 token balance for a specific wallet address against a given token contract on Ethereum mainnet.
Price / call$0.01
Success—
StatusUnknown
How this service works
ERC-20 token balance for a wallet against one token contract, on Ethereum, from Etherscan's V2 API. Requires contract_address as a query param. Returns the raw balance in the token's smallest unit (decimals aren't included in this endpoint's response). $0.01/call.
Output
Returns the raw token balance as an integer string in the token's smallest unit (e.g. wei-equivalent for that token). Token decimals are not included, so the calling agent must separately know the token's decimal precision to convert to a human-readable amount.
Example use cases
DeFi portfolio token audit
“Check the raw USDT balance for wallet 0x742d35Cc6634C0532925a3b844Bc454e4438f44e against the USDT contract 0xdAC17F958D2ee523a2206206994597C13D831ec7 on Ethereum — give me the balance in the smallest unit.”
Airdrop eligibility verification
“Before sending out the airdrop, verify that wallet 0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe holds any amount of our token at contract 0x6B175474E89094C44Da98b954EedeAC495271d0F on Ethereum.”
Smart contract balance monitoring
“What is the raw DAI balance held by the multisig at 0x5D3a536E4D6DbD6114cc1Ead35777bAB948E3643 according to the DAI contract 0x6B175474E89094C44Da98b954EedeAC495271d0F on Ethereum?”
Technical details
Endpoint
GEThttps://www.x402financialdata.com/token-balance/:addressWhen to prefer
Use this endpoint when you need the on-chain ERC-20 token balance for a specific wallet-contract pair on Ethereum mainnet and you already know both the wallet address and the token contract address. It is more targeted than a multi-token portfolio endpoint when you only need a single token's balance. Prefer this over native ETH balance endpoints when querying ERC-20 tokens. Note that you will need to handle decimal conversion separately since this endpoint returns only the raw smallest-unit value.
Side effects
- Invalid or malformed wallet address returns an error
- Invalid or non-ERC-20 contract address returns an error or zero balance
- Contract address is for a non-Ethereum chain — only 'eth' is supported
- Wallet address has never interacted with the token — returns zero balance (not an error)
- Etherscan API downtime or rate limiting causes 5xx or timeout
- Payment failure (insufficient USDC) blocks the call
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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