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Tollkit Chain Balance
x402
Tollkit Chain Balance is a paid API for AI agents from attest.tollkit.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-10).
Retrieves native and ERC-20/SPL token balances for a given wallet or contract address on Base, Ethereum, or Solana, paid per-call via x402 USDC micropayment.
Price / call$0.002
Success—
StatusUnknown
How this service works
Pay-per-call product page extraction. No account, no API key: pay in-band with x402 in USDC on Base or Solana.
Output
Returns native token balances and, optionally, balances of specified ERC-20 (Ethereum/Base) or SPL (Solana) tokens for the queried address on the selected chain. Includes balance amounts per token contract and the native coin balance.
Example use cases
DeFi portfolio snapshot
“Can you pull the native ETH plus USDC and WETH balances for 0xAbC1234...5678 on Base so I can see a quick snapshot of that wallet?”
Solana wallet audit
“Check the SOL balance and the BONK SPL token balance for the Solana address 7xKq...mNpR right now.”
Smart contract treasury check
“Look up how much ETH and DAI the contract at 0xDeF9...8765 is holding on Ethereum mainnet.”
Technical details
Endpoint
POSThttps://attest.tollkit.dev/chain/balance?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a pay-per-call, zero-account-setup balance lookup across Base, Ethereum, or Solana. It is ideal for agents that need on-chain balance data intermittently without committing to an API subscription, or when embedding micropayment-gated blockchain queries in an automated workflow.
Side effects
- Invalid address format returns a validation error
- Unsupported chain value returns an enum mismatch error
- More than 20 token contracts in the tokens array returns an input size error
- Address with no on-chain history may return zero balances
- Micropayment failure via x402 results in a 402 Payment Required response and no balance data
- Network congestion or RPC outage may cause timeouts
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. |
Tags
x402
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