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Swift Bot Labs EVM Balance Checker
x402
Swift Bot Labs EVM Balance Checker is a paid API for AI agents from x402-toolbox.swiftbotlab.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-31).
Fetches native and ERC-20 token balances for a given EVM wallet address on a specified blockchain network
Price / call$0.005
Success—
StatusUnknown
How this service works
62 small, deterministic utility APIs (DNS and e-mail checks, web extraction, EVM decoding, x402 checks, IP math, JSON/CSV, hashing, conversions). No account or API key: pay per call in USDC with x402.
Output
Returns a JSON object with the queried wallet address, the chain name, the native token symbol and balance (e.g. ETH: 0.0012), and an array of ERC-20 token entries each containing the contract address, symbol, and balance. All balances are human-readable decimal strings.
Example use cases
Pre-transaction funds verification
“Before I send 0.001 ETH, can you confirm that wallet 0x2481E29895b43e87e547a50fB0BB5aa1E70585EB on Ethereum actually has enough ETH to cover it?”
DeFi portfolio snapshot
“Give me the native ETH balance plus the USDC and USDT token balances for address 0xAbcd1234...5678 on Arbitrum.”
Multi-token airdrop audit
“I need to check whether address 0xDead...Beef received any tokens at contract 0x8335... on Base — can you pull its current balance there?”
Technical details
Endpoint
GEThttps://x402-toolbox.swiftbotlab.workers.dev/v1/evm/balance?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, no-registration balance lookup for an EVM-compatible address across major chains (Ethereum, Base, Arbitrum, Optimism, Polygon, BSC, Avalanche, Gnosis, and testnets) and want to pay per-call in USDC without managing API keys. It is ideal for lightweight agent workflows that need occasional on-chain balance checks without committing to a full blockchain data provider subscription.
Side effects
- Invalid or malformed wallet address returns an error response
- Unsupported chain identifier causes a rejection
- Token contract address not found on the specified chain may return zero balance or an error
- Network timeouts from upstream RPC providers
- Payment failure via x402 if USDC funds are insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"tool": "evm-balance",
"result": {
"chain": "base",
"native": {
"symbol": "ETH",
"balance": "0.0012"
},
"tokens": [
{
"token": "0x8335...",
"symbol": "USDC",
"balance": "1.25"
}
],
"address": "0x2481E29895b43e87e547a50fB0BB5aa1E70585EB"
}
}
}Tags
x402
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