# EVM Wallet Nonce Lookup

> EVM Wallet Nonce Lookup is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-30).

Returns the confirmed nonce, pending nonce, next nonce to use, and number of transactions waiting in the mempool for a given wallet address across 12 EVM chains.

## Facts

- Endpoint: POST https://api.vextorium.com/evm-nonce-pago?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/evm-wallet-nonce-lookup-88622da5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Cn4zP_DbMAFfkLegABZ0L

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-wallet-nonce-lookup-88622da5 -d '<json body>'
```

Example prompt: What is the current confirmed nonce, pending nonce, and next nonce to use for wallet 0xb9f06D2734B7E9D7b21B64C4D8b95bd774b71aCf on Base, and are there any transactions waiting in the mempool?

## When to prefer this

Use this endpoint when you need real-time nonce state for a specific wallet on any of the 12 supported EVM chains — particularly when managing transaction sequencing, detecting stuck/pending transactions, or determining the correct nonce before submitting a new transaction. Prefer this over block explorer APIs when you need a unified multi-chain interface with mempool visibility in a single call.

## Known failure modes

- Invalid or malformed wallet address returns an error
- Unsupported chain value causes a validation error (must be one of: base, ethereum, arbitrum, optimism, polygon, bnb, avalanche, gnosis, linea, scroll, sonic, unichain)
- Missing required 'direccion' field in body returns a schema validation error
- Network timeout or RPC node unavailability may result in a service error
- Payment failure (insufficient USDC balance) blocks the request under the x402 protocol

## How this service works

Confirmed and pending nonce of a wallet, next nonce to use and transactions waiting in the mempool. Works on Base, Ethereum, Arbitrum, Optimism, Polygon, BNB Chain, Avalanche, Gnosis, Linea, Scroll, Sonic and Unichain.

## Output

A JSON object containing the chain name, wallet address, confirmed nonce (nonce_confirmado), pending nonce (nonce_pendiente), the next recommended nonce to use (siguiente_nonce), and the count of transactions currently waiting in the mempool (transacciones_en_espera).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "red": {
   "enum": [
    "base",
    "ethereum",
    "arbitrum",
    "optimism",
    "polygon",
    "bnb",
    "avalanche",
    "gnosis",
    "linea",
    "scroll",
    "sonic",
    "unichain"
   ],
   "type": "string",
   "description": "Chain (default base)"
  },
  "direccion": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "red": "base",
  "wallet": "0xb9f06D2734B7E9D7b21B64C4D8b95bd774b71aCf",
  "nonce_pendiente": 1,
  "siguiente_nonce": 1,
  "nonce_confirmado": 1,
  "transacciones_en_espera": 0
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/evm-wallet-nonce-lookup-88622da5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)