Blockaid Brings Real-Time Transaction Protection to Arc with MetaMask

Executive Summary

Circle is an established leader in digital finance, the issuer of USDC and the infrastructure behind trillions of dollars in stablecoin settlement worldwide. As a publicly traded company operating at the center of the regulated stablecoin economy, Circle has spent years building the rails that connect enterprises, financial institutions, and developers to onchain dollars.

Arc is an open, EVM-compatible Layer-1 blockchain, purpose-built for stablecoin finance and designed to serve as core financial infrastructure for the internet. Built from the ground up for institutional-grade onchain activity, Arc pairs stablecoins as gas, starting with USDC, with deterministic sub-second finality and predictable, dollar-based fees. Its launch arrives with deep institutional backing and broad ecosystem participation, and a clear ambition to bring payments, FX, credit, and capital markets onchain on infrastructure built for the demands of regulated, enterprise-scale finance.

Blockaid brings real-time transaction protection to Arc at launch through the wallets people already use, starting with Arc's flagship wallet partner, MetaMask. Every transaction and signature an Arc user is about to approve in MetaMask is first simulated and validated against Blockaid's threat intelligence in real time, so as to alert the user against scams, malicious approvals, and fraudulent transactions before they are signed.

Arc provides the institutional-grade rails, MetaMask brings users onto them, and Blockaid adds a real-time security layer that protects those users at the point of every transaction.

Blockaid Brings Transaction Security to Arc

As Arc opens to developers, enterprises, and the users they serve, the teams and individuals transacting on it need protection that meets them where they actually transact, inside the wallet, at the moment of signing. With this release, Blockaid adds support for Arc, delivering real-time transaction protection to Arc users through MetaMask.

• Transaction Simulation and Validation: Blockaid now simulates and validates transactions on Arc in real time. Before a user signs, Blockaid decodes what a transaction will actually do, the assets that move, the approvals being granted, the contracts being touched, and returns a clear verdict on whether it is safe to proceed. Malicious approvals, untrusted spenders, spoofed contracts, and fraudulent signature requests are flagged before they are signed, giving Arc users the same depth of protection Blockaid brings to every environment it supports.
• Token Scanning: Blockaid continuously analyzes metadata on 40M+ tokens across chains to identify malicious tokens in real time, including those associated with rugpulls, honeypots, spam campaigns, and other scam vectors. Tokens launched on Arc are scanned and classified the same way, so malicious tokens are flagged before Arc users can interact with them.

Blockaid and MetaMask have been partners since 2023, when MetaMask became the first wallet to be integrated and protected by Blockaid. Since then, Blockaid has powered the transaction simulation, validation, and dApp protection that warns MetaMask users before they sign a malicious transaction or connect to a fraudulent site. That protection runs quietly behind tens of millions of wallets, catching scams, drained approvals, and malicious contracts that users would otherwise have no way to see, and it has made Blockaid the security layer trusted by one of the most widely used self-custodial wallets in the world.

With Blockaid securing transactions across many of the most widely used wallets onchain, the protection it brings to Arc is designed to extend with the ecosystem. As more of the wallets Blockaid protects support Arc, the same real-time transaction protection can reach more of the people transacting on the chain, and every malicious actor flagged in one place strengthens detection everywhere Blockaid operates.

Why This Matters: Trust at the Transaction Layer

Arc is built to earn institutional trust at the infrastructure level, through reliable consensus, known validators, configurable privacy, and compliance-aligned design. But the institutions and users moving and custodying assets onto any chain face a variety of risks at the point of interaction: scams, phishing, malicious token approvals, spoofed dApps, and fraudulent transactions that target users directly, regardless of how sound the underlying chain is. These are risks that protocol-level guarantees were never designed to address.

This gap is consistent across every ecosystem. The most damaging losses onchain rarely come from a flaw in the chain itself; they come from a user being deceived into signing something they did not understand, or a transaction routed somewhere it should never have gone. A secure user experience  requires real-time monitoring and alerting, at the moment of signing, on the riskiness of the transaction. By analyzing each transaction before it is approved, Blockaid closes the gap between a secure chain and a safe experience for the people using it. Metamask, as the preferred wallet for Arc, will now offer this real-time monitoring and protection, powered by Blockaid.

Looking Ahead: Securing Arc as It Grows

Arc is launching into a moment when institutional capital and enterprise builders are moving onchain faster than ever, and onto infrastructure built specifically for stablecoin finance. As that activity grows, the security layer underneath it needs to grow with it.

Blockaid evolves alongside the chains it supports, building protection that reflects how each environment actually works rather than applying generic tooling after the fact. Transaction simulation and validation is the foundation Blockaid brings to Arc at launch, and it is one part of a broader security platform that can extend across the ecosystem as Arc grows. Over time, that coverage can deepen to include:

• Transaction Scanning: simulates and validates transactions and all of their parameters before they are signed, surfacing every outcome, including approvals, fund movements, and contract interactions.
• Token Scanning: continuously analyzes metadata on 40M+ tokens across chains to identify malicious tokens in real time, including those associated with rugpulls, honeypots, spam campaigns, and other scam vectors, before onchain participants interact with them.
• Address Scanning: evaluates any crypto address across 24+ exposure categories, including sanctioned entities, fraud, stolen funds, CSAM, and darknet services, covering all hops and fund movements from preceding addresses.
• dApp Scanning: analyzes blockchain frontend applications for signs of compromise, malicious code injection, or fraudulent behavior, providing protection at the moment of wallet connection.

As Arc's ecosystem expands, as more applications deploy and more users transact, Blockaid will continue expanding its coverage, so that the people and institutions building on Arc can do so with confidence.

About Blockaid

Blockaid is the onchain security platform trusted by the largest companies operating in Web3. Built by veterans of elite intelligence and cybersecurity units, Blockaid provides end-to-end protection for financial institutions, protocols, and end users, combining direct wallet and dApp integrations with real-time monitoring, detection, and response across smart contracts, infrastructure, and externally owned accounts. Since 2025, Blockaid scanned over 6.3 billion transactions and blocked 585 million attacks. Blockaid is the security infrastructure behind Coinbase, MetaMask, Uniswap, Safe, and dozens of the most widely used platforms in the industry.

Learn more at Blockaid.io, and follow us on Twitter and LinkedIn.