Ledgerbell watches your wallets, Safe multisigs and contracts on Base, Ethereum, Arbitrum and OP Mainnet and posts an alert to Discord, Slack, Telegram, ntfy or any webhook. Free for 3 watches. No signup.
Hosted Defender Monitor is gone. Recreate the common monitors (proxy upgrades, ownership and role changes, pauses, custom events) in a minute without running your own infrastructure.
Defender monitor alternative →Alert the team channel when a Safe adds or removes an owner, changes the threshold, enables a module or guard, executes a transaction, or when a new transaction is queued before anyone signs it.
Safe multisig alerts →Most wallet drains start with a signed approval. Get pinged the moment a watched wallet grants an ERC-20 approval or setApprovalForAll, and revoke it before it is used.
Token approval alerts →When a proxy you depend on emits Upgraded, Pro sends a report comparing the old and new implementation: added/removed functions and events, changed source files, verification status.
Know when USDC or any ERC-20 arrives or leaves a treasury, hot wallet or payment address. Zero-value "address poisoning" transfers are filtered out.
Any contract + event signature, delivered as JSON to your webhook. Also usable by AI agents: pay for Pro with x402 and manage watches over HTTP.
API docs →⚠️ Approved 0x3f2a…91c0 to spend UNLIMITED token 0x8335…2913. If you did not mean to, revoke it. [hot wallet] Base · block 52750911 https://basescan.org/tx/0x…
🕒 New queued Safe transaction #412 on [Treasury] Safe 0x9a1b…77e2 (Ethereum) addOwnerWithThreshold → 0x9a1b…77e2 ⚠️ changes Safe settings Signatures 1/3 · proposed by 0x4e28…88cF
| Free | Pro — 5 USDC / 30 days | |
|---|---|---|
| Watches | 3 | 30 |
| Alerts per day | 50 | 1,000 |
| Wallet transfers + approvals, admin events, custom events | ✓ | ✓ |
| Queued Safe transaction alerts | – | ✓ |
| Proxy-upgrade "what changed" reports | – | ✓ |
Paid in USDC on Base (any wallet or exchange withdrawal), or by AI agents via x402. Details.
No. You get an API key (lb_…) in one click. No email, no password, no card.
Base, Ethereum, Arbitrum One and OP Mainnet.
Chains are polled every minute; alerts usually arrive within 1–2 minutes of the block. Queued Safe transactions are checked every ~15 minutes, or every ~2 minutes with your own Safe API key.
No. It is a notification tool. Use it alongside your other controls.