# santyvv-data Chain Nonce Lookup

> santyvv-data Chain Nonce Lookup is a paid API for AI agents from x402.santyvv.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-11).

Fetches the current nonce for a blockchain address or chain state via a pay-per-call API using x402/USDC micropayments

## Facts

- Endpoint: GET https://x402.santyvv.com/api/chain/nonce?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/santyvv-data-chain-nonce-lookup-53111eb1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mvK1zIu6UNffs4VN6Mf1n

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 santyvv-data-chain-nonce-lookup-53111eb1
```

Example prompt: What's the current on-chain nonce for my wallet address 0xAbC...123 on Base? I need it to sequence my next transaction correctly.

## When to prefer this

Use this endpoint when you need a quick, keyless nonce lookup for a blockchain address on Base (or supported chains) without setting up an RPC provider or API key. It is ideal for agents that need on-chain account state for transaction construction and want to pay per-call in USDC via x402 rather than manage subscriptions or credentials. Prefer it over raw RPC calls when you want normalized, edge-cached responses with multi-source fallback.

## Known failure modes

- Invalid or missing address parameter returns an error response
- Chain or RPC backend unavailable causes a 5xx or timeout
- x402 payment failure (insufficient USDC balance or payment not accepted) results in a 402 response with no data
- Rate limits or upstream provider issues may cause intermittent failures
- Querying an address with no transaction history may return nonce of 0, which is valid but could be misread as an error

## How this service works

Market and on-chain data, paid per call in USDC on Base through the x402 protocol. No accounts, no API keys. Sources are public data providers; the value added here is keyless access, edge caching, multi-source fallback and normalised responses.

## Output

Returns the current nonce (transaction count) for the queried blockchain address or chain state, normalized into a consistent response format. The nonce represents the number of confirmed transactions sent from the address, usable directly for constructing the next 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",
     "properties": {}
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/santyvv-data-chain-nonce-lookup-53111eb1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.santyvv.com](https://www.zero.xyz/host/x402.santyvv.com/llms.txt)