About the Transaction Firewall

Introduction

The Harpie RPC is an easy way to add two-factor-authentication to your transactions. Harpie RPC seamlessly plugs into your existing wallet, no downloads required.

When you sign a transaction that could be dangerous (i.e. asset-bearing transactions, suspicious contract address), Harpie sends you a notification over email to confirm the transaction. The transaction requires an explicit verification over email before it's sent out to the network.

What is a "dangerous transaction"?

Harpie categorizes dangerous transactions as those that can lose you money. These generally are approvals and transfers of tokens and ETH, but also include gasless OpenSea signature scams.

Dangerous transactions also include those where you try to interact with potentially bad wallets & smart contracts. These include, but are not limited to:

• Bots

• Phishing accounts

• Honeypot contracts

• Wallets linked to cybercrime

How it works

Harpie RPC sits between your wallet and the blockchain, stopping potentially malicious transactions from draining your wallet.

Harpie RPC sits between your wallet and the blockchain. It scans outbound transactions from your wallet, notifying you if you are transacting with thieves, scammers, or other bad actors.

We utilize large data models, lists of known criminal addresses, and hand-picked data to ensure that malicious transactions are caught. We have over 1,000,000 malicious addresses and 40,000 benign addresses in our database, with more being added every day.

If your transaction gets flagged, you receive a notification over email to confirm the transaction. Now, you'll have a chance to review your transaction and view any security warnings that we've identified with the account.

An example email from Harpie RPC

If you approve the transaction, your transaction will be forwarded to Infura nodes to be confirmed on the blockchain.

What are RPC modes?

After signing up with Harpie RPC, revisit or refresh the page to view your Harpie RPC dashboard.

After signing up with your email on Harpie RPC, you can access your dashboard at any time by revisiting the site and connecting with your wallet. There are 3 modes:

OFF	Disable Harpie RPC
NORMAL	Get notifications for suspicious transactions
STRICT	Get notifications for EVERY transaction

On NORMAL mode, you should only receive a notification when interacting with dangerous addresses. That means you can interact with dApps like Curve, OpenSea, and Uniswap normally without having to check your email. However, just like your bank, we'll send you an email as soon as we see something suspicious. That way you can double check your transaction and stop a rug.

Test Harpie RPC

1. First, make sure your wallet address is registered with Harpie

2. Next, switch to the Harpie RPC
3. Now, try sending 0.000001 ETH to vitalik.eth. Vitalik's transaction history actually resembles that of a bot, so it gets flagged by our system

4. If everything is set up properly, you should get an email like this:

The email you get after trying to send ETH to Vitalik.eth

How to use Harpie RPC

Harpie is currently in Early Access as of writing this article. However, you can still sign up for Early Access by DM'ing the official Harpie Twitter with this info:

• Your wallet address (that you'd like to get whitelisted for)

• Why you're excited to use Harpie RPC

You will receive a response from the official Harpie account once you've been verified!