Protection from Drainers: How Predicate + Blockaid Make Stablecoins and RWAs Secure

One malicious signature can empty an entire crypto wallet.

That is the threat posed by wallet drainers: malicious smart contracts and applications that trick users into approving transactions that transfer their assets to an attacker. Drainers are often disguised as legitimate token claims, airdrops, mints, or DeFi applications, making them difficult to distinguish from the products users interact with every day.

From 2023 through 2025, Scam Sniffer tracked more than $870 million stolen by drainers from hundreds of thousands of victims. That makes drainers a threat to continued blockchain adoption. New users are less likely to use onchain assets for everyday finance if they believe one bad transaction signature can wipe out their holdings. Likewise, financial institutions and fintechs are less likely to issue onchain assets if those assets carry a high risk of being stolen.

That’s why Predicate and Blockaid are giving asset issuers a new way to address that risk directly: drainer protection built into the token itself.

Protecting assets from drainers with Predicate + Blockaid

With Blockaid data now available in Predicate, asset issuers can set a policy that blocks every drainer contract Blockaid identifies from receiving their token. 

Blockaid is the leading drainer detection engine in the world. Its platform has identified over 563,000 drainer smart contracts since November 2025 – an average of more than 2,300 per day. For asset issuers integrating Predicate, drainer contracts can be blocked from receiving or holding the asset in real-time. 

In practical terms, this means that assets are protected by the industry leading policies offered by Predicate and the cutting-edge real-time scanning engine offered by Blockaid. Even if a holder signs the drainer's malicious approval, Predicate prevents the transfer from executing, and the asset never leaves the holder’s wallet. That level of protection is a key differentiator for retail users and institutions considering onchain financial products. For users it reduces the risk that one bad click leads to a catastrophic loss. For issuers, it creates stronger trust on the asset itself. 

How it works

Predicate Asset Compliance enforces issuer policies at the token contract level, restricting addresses based on high-risk attributes as determined by trusted data sources. Blockaid is one of those critical data sources.

Drainer detection sits inside Blockaid's End User Protection Suite, specifically its dApp Scanning engine. That system evaluates the entire application, combining offchain and onchain signals to review a site's code for malicious scripts and known drainer signatures, simulate the transactions it generates, and screen every address it touches against Blockaid's threat intelligence. Drainer contracts are one of the threats that analysis surfaces, often before any theft is carried out, and every identification becomes part of the dataset Blockaid feeds into Predicate.

When an issuer sets a policy via Predicate restricting drainers identified by Blockaid, Predicate adds every flagged contract to the token's onchain blocklist. Predicate ingests updates continuously, so the moment Blockaid identifies a new drainer, Predicate adds it to the blocklist, closing the window in which a fresh drainer can steal the issuer’s asset.

The entire process runs in the background. Compliant holders experience no change to how they use the token, until the one moment it matters: if they sign a malicious drainer approval, they see the theft transaction fail rather than watch their balance disappear.

Making blockchains safer

Drainers are the rare crypto attack that scales with success. The more users that come onchain, the more targets exist, and the losses return with every market cycle unless something structural changes. Blocking known drainers at the asset level is that structural change. It moves protection from personalized security practices to automatic protection for every holder.

For asset issuers, safety has always been sold independent of the asset. Predicate and Blockaid make it a property of the asset itself, and a property that matters to users.

Contact us to learn more about how Predicate and Blockaid can protect your assets.