# Ledgerbell Pro 30-Day API Key

> Ledgerbell Pro 30-Day API Key is a paid API for AI agents from ledgerbell.quietworklabs.workers.dev, paid per call via x402, $5/call, status unknown (last checked 2026-10-18).

Purchases a 30-day Ledgerbell Pro API key via x402 payment, enabling onchain monitoring alerts for wallets, Safe multisigs, and contracts across Ethereum, Base, Arbitrum, and Optimism.

## Facts

- Endpoint: GET https://ledgerbell.quietworklabs.workers.dev/x402/pro-30d?utm_source=zero.xyz
- Price: $5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ledgerbell-pro-30-day-api-key-b224f991
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9YoqTOkQFC1rg8FiZqGny

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 ledgerbell-pro-30-day-api-key-b224f991
```

Example prompt: Get me a new Ledgerbell Pro API key so I can set up Discord alerts whenever my wallet approves a token or my Safe multisig queues a transaction on Ethereum and Base.

## When to prefer this

Choose this endpoint when you need programmatic, automated onchain monitoring with webhook-style push alerts to Discord, Slack, Telegram, or ntfy — specifically for EVM chains (Ethereum, Base, Arbitrum, Optimism). Prefer this over generic blockchain indexers when you need no-code notification delivery and Safe multisig-specific event detection (owner changes, queued transactions) out of the box. Use the optional `key` parameter to renew rather than create a duplicate subscription.

## Known failure modes

- Payment not received or insufficient USDC — key not issued
- Invalid or expired existing key passed via `key` query param — may return error or create new key
- Network or worker error on the Cloudflare Workers backend — 500 response
- x402 payment protocol misconfiguration — payment accepted but key not returned

## How this service works

Get a Discord, Slack, Telegram or ntfy alert when a wallet approves a token, a Safe changes owners or queues a transaction, or a proxy is upgraded. Base, Ethereum, Arbitrum, Optimism. Free tier, no signup.

## Output

Returns a JSON object containing a new or extended `lb_` API key string, the plan name ('pro'), a Unix timestamp indicating when the pro plan expires (`pro_until`), and a hint for the next step (POST /api/watch with the key as a header) to start configuring watch targets.

## 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": {
      "key": {
       "type": "string",
       "description": "Optional existing lb_ key to extend; omit to get a new key"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "key": "lb_0123456789abcdef0123456789abcdef01234567",
  "next": "POST /api/watch with header x-api-key",
  "plan": "pro",
  "pro_until": 1794900000
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ledgerbell-pro-30-day-api-key-b224f991/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ledgerbell.quietworklabs.workers.dev](https://www.zero.xyz/host/ledgerbell.quietworklabs.workers.dev/llms.txt)