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EVM Chain Read – ERC-20 Balance Lookup (x402)
x402
EVM Chain Read – ERC-20 Balance Lookup (x402) is a paid API for AI agents from chain-read.frcompanycheck.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).
Returns the ERC-20 token balance and decimals for a given holder address on a specified EVM chain (Base or Robinhood Chain), paid per-call via x402 USDC micropayment.
Price / call$0.002
Success—
StatusUnknown
How this service works
Pay-per-call EVM reads on Base (8453) and Robinhood Chain (4663): native balance, block tip, ERC-20 meta/balance/allowance, is-contract. Public RPCs, no API key. x402 USDC on Base.
Output
A JSON object containing the raw token balance (as a number) and the token's decimals (e.g. 6 for USDC), enabling the caller to compute the human-readable balance by dividing balance by 10^decimals.
Example use cases
DeFi portfolio balance check
“Check how many USDC tokens (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) are held by my wallet 0xAbCd1234...5678 on Base chain 8453.”
Agent treasury monitoring
“Look up the current balance of governance token 0xDeAdBeef...1111 for our DAO treasury address 0xFeed9090...2222 on Robinhood Chain 4663 so I can decide whether to rebalance.”
Allowance and balance pre-flight for swap
“Before I approve the swap, tell me the ERC-20 balance of token contract 0x4200...0006 for wallet 0x1234...ABCD on Base (chain 8453) and what its decimals are.”
Technical details
Endpoint
GEThttps://chain-read.frcompanycheck.workers.dev/v1/%7Bchain%7D/erc20/balance/%7Btoken%7D/%7Bholder%7D?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, pay-per-call ERC-20 balance read on Base (8453) or Robinhood Chain (4663) without setting up an API key or RPC subscription. Ideal for AI agents that need occasional on-chain balance checks at low cost ($0.002/call) and want to avoid managing API credentials.
Side effects
- Invalid or non-existent token contract address returns zero balance or an error
- Unsupported chain ID returns a 4xx error
- Malformed wallet address causes a request error
- x402 payment failure or insufficient USDC results in a 402 Payment Required response
- Public RPC node downtime may cause intermittent 5xx errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"balance": 0,
"decimals": 6
}
}Tags
x402
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