# PennyRail Nano Chain Block Number – Latest Block Number

> PennyRail Nano Chain Block Number – Latest Block Number is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Returns the latest block number for a nano blockchain chain via a paid HTTP endpoint

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/nano/chain.block-number--latest-block-number
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pennyrail-nano-chain-block-number-latest-block-number-8e2bdc05
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_i0sv7bYin2HzfDjY84PoD

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 pennyrail-nano-chain-block-number-latest-block-number-8e2bdc05 -d '<json body>'
```

Example prompt: What is the latest block number on the nano chain right now?

## When to prefer this

Use this endpoint when you need a quick, paid, machine-readable lookup of the current block number on the nano chain without running your own node. Prefer it for lightweight polling, audit logging, or triggering workflows based on block height changes.

## Known failure modes

- Invalid or missing input object causes 400 or schema validation error
- Payment not provided or insufficient USDC causes 402 Payment Required
- Upstream nano node unavailable causes 503 or timeout
- Malformed response if chain RPC is unreachable
- Rate limiting if too many requests in short period

## How this service works

Machine-readable settlement service

## Output

Returns an object containing the latest block number (block height) for the nano chain, indicating the most recently confirmed block on the network.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pennyrail-nano-chain-block-number-latest-block-number-8e2bdc05/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pennyrail.vercel.app](https://www.zero.xyz/host/pennyrail.vercel.app/llms.txt)