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1gateway Base Onchain Balances
x402
1gateway Base Onchain Balances is a paid API for AI agents from 1gateway.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-13).
Fetches ETH balance, ERC-20 token balances, nonce, contract status, and block metadata for any Base mainnet address in a single call
Price / call$0.002
Success—
StatusUnknown
How this service works
Use when an agent needs what a Base address holds in one call instead of one RPC call per token. Input: address; optional tokens (up to 20 ERC-20 addresses, comma-separated; default USDC, EURC, USDbC, WETH, cbBTC, cbETH, wstETH). Output: JSON block+time, ETH balance, per-token symbol, decimals, raw and decimal balance, nonce, isContract. Chain state only, no prices. Bad input: 400, not charged. Example: ?address=0x6246eee0355Dd7A93C888fE59e1151388A0cC5a1
Output
Returns a JSON object with chain metadata (chain name, chainId, block number, block timestamp), ETH balance in wei and decimal, per-token entries with symbol, decimals, raw and decimal balance, address contract/EOA status with code size, transaction count (nonce), and the RPC source used. Tokens not found or not ERC-20 compliant are flagged with a status field.
Example use cases
DeFi portfolio snapshot for Base wallet
“Pull the full token breakdown for 0x6246eee0355Dd7A93C888fE59e1151388A0cC5a1 on Base — I want ETH, USDC, WETH, cbBTC, and cbETH balances with decimals so I can see what this wallet holds right now.”
Verify user deposit before processing
“Before I release the order, check that 0xAbCd1234abcd1234abcd1234abcd1234abcd1234 on Base has received at least some USDC — give me its current USDC balance and the block timestamp so I can confirm the timing.”
Classify address type and nonce check
“Is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base a smart contract or a regular wallet, and what's its current nonce and ETH balance?”
Technical details
Endpoint
GEThttps://1gateway.dev/v1/onchain/base/balances?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a comprehensive Base mainnet wallet snapshot — ETH plus up to 20 ERC-20 balances — in a single HTTP call instead of making separate RPC calls per token. It is ideal when you need block-timestamped, normalized decimal balances alongside contract detection and nonce in one response. It does not return token prices, so if you only need price data use a price feed instead. Best for agents auditing wallet state, verifying deposits, or building portfolio summaries on Base.
Side effects
- 400 returned for malformed address (not 0x + 40 hex or invalid EIP-55 checksum) — not charged
- 400 returned if more than 20 token addresses are supplied
- Token listed as status: not_an_erc20 if the contract address is not a valid ERC-20
- Network or RPC errors may return 5xx if Base node is unreachable
- Invalid or unknown token contracts return null for symbol/decimals/balance with an error status
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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