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EVM Token Balance & Allowance Checker
x402
EVM Token Balance & Allowance Checker is a paid API for AI agents from free-asset-radar-x402.besenok2018.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-16).
Fetches the token balance and ERC-20 spending allowance for an EVM wallet address on a specified network
Price / call$0.003
Success—
StatusUnknown
How this service works
Stable edge-hosted x402 utilities for autonomous agents.
Output
Returns a JSON object with the token balance (as a decimal string), the network name, and the current ERC-20 allowance approved for the specified spender address.
Example use cases
Pre-trade allowance verification
“Before I swap tokens on Uniswap, check if my wallet 0xAbC...123 has enough USDC allowance approved for the Uniswap v3 router contract on Base — and also tell me my current USDC balance.”
DeFi position monitoring
“What's the current AAVE token balance and how much is approved for the AAVE lending pool spender on my wallet 0xDef...456 on Ethereum mainnet?”
Agent treasury balance check
“My agent wallet is 0x789...GhI — can you look up its USDC balance and check how much is approved for the 1inch aggregator contract on Base?”
Technical details
Endpoint
GEThttps://free-asset-radar-x402.besenok2018.workers.dev/api/x402/evm-token-balance-allowance?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent needs a lightweight, pay-per-call EVM token balance and allowance lookup without setting up a full RPC node or indexer. Ideal for autonomous agents operating on Base or other EVM chains that need quick pre-transaction checks at minimal cost ($0.003 USDC per call via x402 protocol).
Side effects
- Invalid or malformed wallet address returns an error response
- Unsupported network name causes lookup failure
- Token contract address not found on specified network
- Spender address not provided results in missing allowance data
- Rate limiting or edge node unavailability may cause transient failures
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| required | string | |
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"balance": "12.5",
"network": "base",
"allowance": "3"
}
}Tags
x402
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