# chain.openverbs.com EVM Address State Lookup

> 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 2026-09-15).

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.

## Facts

- Endpoint: POST https://chain.openverbs.com/v1/address
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/chain-openverbs-com-evm-address-state-lookup-381ef5d7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Qlu6K77rjKjyCYpWjLP4y

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability chain-openverbs-com-evm-address-state-lookup-381ef5d7 -d '<json body>'
```

Example prompt: What's the current ETH balance and nonce of 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Ethereum, and is it a contract or a regular wallet?

## When to prefer this

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.

## Known failure modes

- 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

## How this service works

Live state of an address: native balance (wei + ether), transaction count (nonce), and whether it's a contract or an externally-owned account (with deployed code size). Reads live on-chain data with automatic endpoint fallback.

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "properties": {
      "chain": {
       "enum": [
        "ethereum",
        "base",
        "arbitrum",
        "optimism",
        "polygon"
       ],
       "type": "string",
       "description": "EVM chain to query. One of: ethereum, base, arbitrum, optimism, polygon. Default \"ethereum\"."
      },
      "address": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{40}$",
       "description": "20-byte hex address."
      }
     },
     "additionalProperties": false
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/chain-openverbs-com-evm-address-state-lookup-381ef5d7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from chain.openverbs.com](https://www.zero.xyz/host/chain.openverbs.com/llms.txt)