# Arbitrum Nonce Lookup

> Arbitrum Nonce Lookup is a paid API for AI agents from agent-data-tools.revmesh2074.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-19).

Returns the current transaction nonce and pending nonce for an Ethereum address on Arbitrum One

## Facts

- Endpoint: GET https://agent-data-tools.revmesh2074.workers.dev/arb/nonce?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/arbitrum-nonce-lookup-b7ba4b9a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6Vzz88TC0YEoGUOhVh6Nc

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 arbitrum-nonce-lookup-b7ba4b9a
```

Example prompt: What is the current nonce and pending nonce for the Arbitrum One address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 — and has it ever sent a transaction?

## When to prefer this

Use this endpoint when you specifically need nonce data on Arbitrum One. It is pay-per-call with no API key required, making it ideal for one-off agent queries or low-volume automation. Prefer this over raw RPC calls when you need a clean, structured JSON response without managing your own node or provider credentials. For nonces on other chains (Base, Ethereum, Optimism, Polygon), use the corresponding sibling endpoints from the same Agent Data Tools service.

## Known failure modes

- Invalid or malformed 0x address returns an error response
- Address not found on Arbitrum (brand-new address with no activity) may return nonce 0 and hasSent false
- Network or RPC issues on Arbitrum may cause timeouts or 5xx errors
- Missing required 'address' query parameter returns a validation error
- Payment failure (insufficient USDC balance) results in 402 response and no charge

## How this service works

Read the transaction count (nonce) of a 0x address on Arbitrum One, both confirmed and including pending transactions. Use to build the next transaction or to tell whether an address has ever sent anything; for its balance use arb_balance. A malformed address is rejected with 400, uncharged.

## Output

Returns a JSON object with the wallet address, the chain name ('Arbitrum One'), the chainId (42161), the confirmed nonce (total transactions sent), the pending nonce (including mempool), and a boolean hasSent indicating whether the address has ever sent a transaction.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{40}$",
       "examples": [
        "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
       ],
       "description": "0x address"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "chain": {
       "type": "string"
      },
      "nonce": {
       "type": "number"
      },
      "address": {
       "type": "string"
      },
      "chainId": {
       "type": "number"
      },
      "hasSent": {
       "type": "boolean"
      },
      "pendingNonce": {
       "type": "number"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "chain": "Arbitrum One",
  "nonce": 1204,
  "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
  "chainId": 42161,
  "hasSent": true,
  "pendingNonce": 1204
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/arbitrum-nonce-lookup-b7ba4b9a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent-data-tools.revmesh2074.workers.dev](https://www.zero.xyz/host/agent-data-tools.revmesh2074.workers.dev/llms.txt)