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Wallet Balance
x402
Wallet Balance is a paid API for AI agents from chain.tollkit.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-11).
Fetches native and ERC-20/SPL token balances for a given wallet or contract address on Base, Ethereum, or Solana, paid per-call via x402 in USDC.
Price / call$0.002
Success—
StatusUnknown
How this service works
Wallet balances, tokens, transactions and prices on Base, Ethereum and Solana. Other Tollkit tools are described at: https://extract.tollkit.dev/openapi.json, https://attest.tollkit.dev/openapi.json, https://web.tollkit.dev/openapi.json, https://data.tollkit.dev/openapi.json.
Output
Returns the native token balance (ETH, SOL, etc.) and balances for any requested ERC-20 or SPL tokens held by the specified address on the chosen chain, typically as a structured JSON object with token symbols, contract addresses, and formatted amounts.
Example use cases
DeFi portfolio snapshot
“Give me a full breakdown of native and token balances for 0xAbCd1234567890abcdef1234567890abcdef1234 on Base, including these ERC-20s: 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 and 0x6B175474E89094C44Da98b954EedeAC495271d0F.”
Solana airdrop eligibility check
“Check the SOL balance and SPL token holdings for the Solana wallet 7xKXtg2CW87d97TXJSDpbD5jBkheTqA83TZRuJosgAsU.”
Smart contract treasury audit
“Look up the ETH and ERC-20 token balances for the contract address 0xDEF1...0099 on Ethereum so I can see what's in the treasury.”
Technical details
Endpoint
POSThttps://chain.tollkit.dev/chain/balance?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to check wallet or contract balances on Base, Ethereum, or Solana without setting up an account or API key — payment is handled inline via x402 USDC micropayments. It's ideal for ad-hoc, pay-as-you-go balance lookups inside autonomous agents or workflows where managing API credentials is impractical.
Side effects
- Invalid address format — returns validation error if address doesn't match expected hex or base58 pattern
- Unsupported chain — error if chain value is not 'base', 'ethereum', or 'solana'
- Too many tokens — error if more than 20 token contracts are provided
- Payment failure — x402 payment not accepted or insufficient USDC balance
- Address not found or empty — returns zero balances or empty response for fresh/unused addresses
- RPC timeout — underlying node may time out for heavily used contracts
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | Which chain to read: "base" (default), "ethereum" or "solana". |
| tokens | array | Extra ERC-20 contracts (or SPL mints on Solana) to include. |
| address | string | Wallet (or contract) address to check. |
Output
Schema · Response
{
"type": "json",
"example": {
"chain": "base",
"native": {
"symbol": "ETH",
"balance": "0",
"balance_wei": "0"
},
"tokens": [
{
"name": "USD Coin",
"symbol": "USDC",
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"balance": "2.222",
"decimals": 6,
"balance_raw": "2222000"
}
],
"address": "0xBbfCE2D320dE6aB328Ba93A771c531ebFC9cE704",
"checked_at": "2026-10-04T07:45:36.553Z",
"is_contract": false,
"block_number": 52155294,
"explorer_url": "https://basescan.org/address/0xBbfCE2D320dE6aB328Ba93A771c531ebFC9cE704"
}
}Tags
x402
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