# EVM Account Nonce Lookup

> EVM Account Nonce Lookup is a paid API for AI agents from bess-x402.onrender.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).

Returns the next transaction nonce, pending tx count, native balance, contract flag, and EIP-7702 delegate for an EVM address across major chains.

## Facts

- Endpoint: GET https://bess-x402.onrender.com/v1/evm/nonce?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/evm-account-nonce-lookup-e5985398
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dUhYpGavD1jQRL4If47Vy

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 evm-account-nonce-lookup-e5985398
```

Example prompt: What's the next nonce I should use for 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Ethereum — give me the confirmed and pending nonce so I can tell if any transactions are stuck.

## When to prefer this

Choose this endpoint when you need accurate nonce management before signing EVM transactions, want to detect stuck or pending transactions, need to check native balances alongside nonce data, or want to determine if an address is an EOA or smart contract — all in a single call across five major EVM chains. Prefer it over manual RPC calls when you need a paid, reliable, hosted endpoint without managing your own node infrastructure.

## Known failure modes

- Invalid or malformed 0x address returns a 4xx error
- Unsupported chain name returns an error — only ethereum, base, arbitrum, optimism, polygon are valid
- RPC node unavailability may cause timeouts or 5xx errors
- ENS names not supported — raw 0x addresses required
- Missing required 'address' query parameter returns a validation error

## How this service works

Next transaction nonce of an EVM address (confirmed and pending), pending tx count, native balance, contract flag and EIP-7702 delegate. Use before signing or to detect stuck transactions.

## Output

Returns a JSON object containing the confirmed nonce (next nonce for confirmed transactions), pending nonce (accounting for mempool transactions), pending transaction count, native token balance (ETH/MATIC etc.), a boolean flag indicating whether the address is a contract, and the EIP-7702 delegate address if one is set.

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "chain": {
       "type": "string",
       "description": "ethereum, base, arbitrum, optimism or polygon"
      },
      "address": {
       "type": "string",
       "description": "0x address"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/evm-account-nonce-lookup-e5985398/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bess-x402.onrender.com](https://www.zero.xyz/host/bess-x402.onrender.com/llms.txt)