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Tollkit Chain Balance
x402
Tollkit Chain Balance is a paid API for AI agents from extract.tollkit.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-10).
Returns the native ETH balance plus USDC, USDT (Ethereum), and up to 20 additional ERC-20 tokens for a given wallet or contract address on Base, Ethereum, or Solana, read live from the chain.
Price / call$0.002
Success—
StatusUnknown
How this service works
Wallet balance on Base or Ethereum: give an address, get its native ETH plus USDC (and USDT on Ethereum), and any other ERC-20 tokens you list (up to 20), with symbols and decimals applied. Read live from the chain. $0.002 per call; a bad address or an RPC failure is not charged.
Output
Returns the wallet's native balance (ETH or SOL) and balances for USDC, USDT (on Ethereum), plus any additional ERC-20 or SPL token contracts specified, with each token's symbol and decimals already applied so amounts are human-readable. Data is read live from the chain at time of request.
Example use cases
DeFi portfolio snapshot for a wallet
“Can you pull the full balance breakdown for 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B on Base — I want to see the native ETH plus USDC and any tokens at these two contract addresses: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and 0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb?”
Monitor treasury wallet holdings on Ethereum
“Check the current ETH, USDC, and USDT balances for our treasury wallet 0x742d35Cc6634C0532925a3b844Bc454e4438f44e on Ethereum so I can see what we're holding right now.”
Verify Solana wallet token balances
“Look up the token balances for the Solana wallet 9WzDXwBbmkg8ZTbNMqUxvQRAyrZzDsGYdLVL9zYtAWWM and include the SPL mint So11111111111111111111111111111111111111112 so I can see its native SOL equivalent holdings.”
Technical details
Endpoint
POSThttps://extract.tollkit.dev/chain/balance?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need live, on-chain balance data for a wallet across Base, Ethereum, or Solana, especially when you want native ETH plus stablecoins (USDC/USDT) and custom ERC-20 holdings in a single call. Prefer this over block explorer APIs when you want pay-per-call pricing with no API key, or when you need decimals already applied. Not suitable for historical balances, NFT holdings, or transaction history.
Side effects
- Invalid address format returns an error without charging the $0.002 fee
- RPC node failure or chain unavailability returns an error without charging
- Requesting more than 20 extra token contracts returns a validation error
- Providing a Solana address format for an EVM chain (or vice versa) may return an error
- Unknown or unverified ERC-20 contract addresses may return zero balance or missing metadata
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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