# PennyRail Chain Info Lookup

> PennyRail Chain Info Lookup is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status down (last checked 2026-10-23).

Retrieves proven chain information for a given nano-chain node via a machine-readable settlement service

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/nano/chain.info--proven-chain-info?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: down
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pennyrail-chain-info-lookup-b73a1753
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_A-YVRKABoqsMnG_oboEyI

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-chain-info-lookup-b73a1753 -d '<json body>'
```

Example prompt: Can you fetch the proven chain info for nano chain node 'xrb_3t6k35gi95xu6tergt6p69ck76ogmitsa8mnijtpxm9fkcm736xtoncuohr' from PennyRail?

## When to prefer this

Use this endpoint when you need machine-readable, programmatically accessible nano chain state or proven chain information and are operating in a pay-per-call x402 settlement context. Prefer this over manual node queries when you need a simple REST interface to nano chain data without running your own node infrastructure.

## Known failure modes

- Invalid or malformed chain identifier input returns an error or empty result
- Payment of $0.001 USDC not provided or rejected results in HTTP 402 before processing
- Unknown chain ID returns empty or null chain info
- Network or upstream nano node unavailability causes timeout or 503
- Malformed input string that doesn't correspond to a valid nano address or chain reference

## How this service works

Machine-readable settlement service

## Output

Returns a JSON object containing proven chain information for the queried nano chain node, including block state, chain metadata, and settlement-relevant chain details. The response schema is open-ended and may include fields such as block count, frontier hash, representative, balance, and chain proof status.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pennyrail-chain-info-lookup-b73a1753/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)