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Financial Data x402 — ERC-20 Token Balance Lookup
x402
Financial Data x402 — ERC-20 Token Balance Lookup is a paid API for AI agents from x402financialdata.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
Returns the raw on-chain token balance of a given wallet address for an ERC-20 token contract on a specified chain, paid per-call via x402/USDC.
Price / call$0.01
Success—
StatusUnknown
How this service works
Pay-per-call stock, macro, on-chain, and crypto data over the x402 protocol. USDC on Base or Solana, no API keys, no subscriptions.
Output
Returns a JSON object containing: the blockchain chain identifier (e.g. 'eth'), the queried wallet address, the token contract address, and the raw_balance as a string in the token's smallest unit (e.g. wei for 18-decimal ERC-20s). Does not return the token's decimals; the caller must divide by 10^decimals (commonly 10^18) to get a human-readable amount.
Example use cases
DeFi portfolio snapshot for a wallet
“Look up the raw token balance for wallet 0xde0b295669a9fd93d5f28d9ec85e40f4cb697bae on Ethereum for the USDC contract 0x833589fcd6edb6e08f4c7c32d4f71b54bda02913 — I want the smallest-unit number so I can calculate the human-readable amount.”
Verify airdrop eligibility by balance
“Can you check whether wallet 0xABCDEF1234567890abcdef1234567890abcdef12 actually holds any tokens for contract 0x833589fcd6edb6e08f4c7c32d4f71b54bda02913 on Ethereum before I whitelist them for the airdrop?”
Monitor whale wallet token holdings
“Fetch the current on-chain token balance for the whale wallet 0x47ac0Fb4F2D84898e4D9E7b4DaB3C24507a6D503 on Ethereum for contract 0x833589fcd6edb6e08f4c7c32d4f71b54bda02913 — I want the raw balance in base units.”
Technical details
Endpoint
GEThttps://x402financialdata.com/token-balance/%7Baddress%7DWhen to prefer
Choose this endpoint when you need a quick, keyless, pay-per-call ERC-20 token balance lookup for an arbitrary wallet address without signing up for an API subscription. It is ideal for agents that need occasional on-chain balance checks at low cost ($0.01 USDC), support USDC micropayments via the x402 protocol, and want to avoid managing API credentials. Prefer it over free RPC calls when you want a reliable, hosted solution, or over subscription-based providers when call volume is low or unpredictable.
Side effects
- Invalid or malformed wallet address returns an error response
- Unknown or unsupported chain identifier may return empty or error
- Payment failure via x402 (insufficient USDC) blocks the request
- Token contract not deployed on the specified chain may return zero or error
- Rate limiting or network issues on the underlying RPC node
- Address with no token holdings returns raw_balance of '0'
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| required | string | |
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"note": "raw_balance is in the token's smallest unit -- this endpoint doesn't return the token's decimals, so divide by 10**decimals yourself for a human-readable amount (most ERC-20s use 18, but not all).",
"chain": "eth",
"address": "0xde0b295669a9fd93d5f28d9ec85e40f4cb697bae",
"raw_balance": "125500000",
"token_contract": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913"
}
}Tags
x402
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