# Agent Tape – Nonce Lookup

> Agent Tape – Nonce Lookup is a paid API for AI agents from agent-tape.annushka1190.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).

Returns the current nonce (transaction count) for a Base ETH address, enabling AI trading agents to correctly sequence on-chain transactions.

## Facts

- Endpoint: GET https://agent-tape.annushka1190.workers.dev/v1/nonce
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-tape-nonce-lookup-8e91d7bd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IEIb-DSZtjIIDA1G8gqL5

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 agent-tape-nonce-lookup-8e91d7bd
```

Example prompt: What's the current nonce for my Base wallet 0xAbC1234... so I can send my next transaction with the right sequence number?

## When to prefer this

Choose this endpoint when an AI trading agent needs to determine the correct nonce for a Base network address before constructing or submitting an on-chain transaction. It is ideal for agents operating on the Base chain without API keys, paying per-request via USDC x402. Prefer this over manual RPC calls when you want a turnkey, pay-as-you-go solution integrated into the Agent Tape DEX data suite.

## Known failure modes

- Invalid or malformed Ethereum address returns an error response
- Network or RPC unavailability on Base chain causes request failure
- Missing address query parameter results in bad request error
- Rate limiting or payment failure via x402 USDC mechanism blocks the request

## How this service works

Live DEX tape for AI trading agents: search pairs, token price and liquidity, pair lookup, boosts, paid DexScreener orders, Base ETH/USDC balance, nonce, contract check, gas, and tx receipt. Pay-per-request USDC via x402. No API keys, no accounts.

## Output

Returns a JSON object with an 'ok' boolean and the current nonce (transaction count) for the queried Base network address, representing how many transactions have been confirmed from that address.

## 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": {
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ]
    },
    "queryParams": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-tape-nonce-lookup-8e91d7bd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent-tape.annushka1190.workers.dev](https://www.zero.xyz/host/agent-tape.annushka1190.workers.dev/llms.txt)