# EVM Nonce Lookup (Optimism)

> EVM Nonce Lookup (Optimism) is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-03).

Returns the current transaction nonce for a given wallet address on the Optimism EVM network

## Facts

- Endpoint: GET https://saylorinnovations.com/api/evm/optimism/nonce/:address?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-03
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/evm-nonce-lookup-optimism-92c8b7dc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_m2hzPE82-L1y4EHWOqTZ9

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-nonce-lookup-optimism-92c8b7dc
```

Example prompt: What's the current nonce for wallet address 0xAbC123...def on Optimism? I need it before I build and sign my next transaction.

## When to prefer this

Use this endpoint when you need the current on-chain nonce specifically for an address on the Optimism L2 network. Prefer it over general RPC calls when you want a simple, pay-per-use REST interface without managing your own Optimism node or RPC provider subscription. Choose the Optimism-specific endpoint (rather than Base or BSC siblings) when the transaction you're building targets the Optimism chain.

## Known failure modes

- Invalid or malformed Ethereum address returns an error
- Address with no transaction history returns nonce of 0 (not an error)
- Network connectivity issues to Optimism RPC node may return a timeout or 5xx error
- Non-checksummed address may be rejected depending on validation strictness

## How this service works

EVM Nonce (optimism). Optimism account nonce: confirmed and pending transaction count for any address.

## Output

Returns the current nonce (transaction count) for the specified address on the Optimism network — an integer representing how many transactions that address has sent, usable directly as the nonce value for the next transaction.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/evm-nonce-lookup-optimism-92c8b7dc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)