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chain.openverbs.com EVM Address State Lookup
x402
chain.openverbs.com EVM Address State Lookup is a paid API for AI agents from chain.openverbs.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-30).
Returns live on-chain state for an EVM address: native balance (wei + ether), nonce/transaction count, and whether it's a contract or EOA with code size.
Price / call$0.002
Success—
StatusUnknown
Output
Returns native token balance in both raw wei and human-readable ether, the address's transaction count (nonce), a boolean or flag indicating whether the address is a contract, and the size of deployed bytecode — all read live from the specified EVM chain with automatic fallback across RPC endpoints.
Example use cases
Verify if address is a contract
“Can you check whether 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum is a smart contract or an externally-owned account, and tell me its code size?”
Pre-flight nonce check before sending a transaction
“Before I send a transaction on Base, can you look up the current nonce for 0x742d35Cc6634C0532925a3b844Bc454e4438f44e so I know the right sequence number to use?”
Portfolio balance snapshot on Polygon
“What's the live MATIC balance (in both wei and ether) for 0x1234567890abcdef1234567890abcdef12345678 on Polygon right now?”
Technical details
Endpoint
POSThttps://chain.openverbs.com/v1/address?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a real-time, multi-field snapshot of an EVM address — balance, nonce, and contract/EOA classification in a single call. Prefer it over token balance endpoints when you need the native coin balance (ETH/MATIC/etc.) rather than ERC-20 tokens. It's especially useful for pre-transaction checks, wallet verification workflows, or determining whether an address hosts deployed code before interacting with it.
Side effects
- Invalid address format (not a 40-char hex prefixed with 0x) — returns validation error
- Unsupported chain name — returns error listing valid chains (ethereum, base, arbitrum, optimism, polygon)
- RPC node unavailability even after fallback — returns upstream error
- Rate limiting or payment failure — returns 402 or 429 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | EVM chain to query. One of: ethereum, base, arbitrum, optimism, polygon. Default "ethereum". |
| address | string | 20-byte hex address. |
Tags
x402
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