# x402-toolbox Chain Transaction Nonce Lookup

> x402-toolbox Chain Transaction Nonce Lookup is a paid API for AI agents from x402-toolbox.shablony-pro.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).

Retrieves the current transaction nonce for a blockchain address on a specified chain, paid per-call via x402 USDC micropayment.

## Facts

- Endpoint: GET https://x402-toolbox.shablony-pro.workers.dev/chain/transaction-nonce?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-toolbox-chain-transaction-nonce-lookup-53c2b888
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WRHbTzZBXNwu9YRnr0DkB

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 x402-toolbox-chain-transaction-nonce-lookup-53c2b888
```

Example prompt: What's the current transaction nonce for my wallet address 0xAbc123... on Base mainnet so I can prepare the next transaction?

## When to prefer this

Choose this endpoint when you need a fast, no-signup nonce lookup for EVM-compatible chains (especially Base) and want to pay per-call with USDC via x402 rather than managing API keys or subscriptions. Ideal for AI agents that need on-chain data in autonomous transaction pipelines without prior account registration.

## Known failure modes

- Invalid or malformed schema parameter returns an error response
- Address not found on specified chain returns null or zero nonce
- Payment failure over x402 protocol results in 402 response and no data returned
- Unsupported chain identifier causes lookup failure
- Network or RPC node timeout on Cloudflare Worker edge

## How this service works

309 deterministic pay-per-call tools for AI agents over x402 (USDC, Base). No signup, no API key: the payment is the identity.

## Output

Returns a JSON object with an 'ok' boolean indicating success and a 'paid' boolean confirming the x402 micropayment was accepted, along with the nonce value for the queried blockchain address and chain.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "schema": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "paid": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-toolbox-chain-transaction-nonce-lookup-53c2b888/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-toolbox.shablony-pro.workers.dev](https://www.zero.xyz/host/x402-toolbox.shablony-pro.workers.dev/llms.txt)