Wallet Screening
for DeFi Protocols
After Tornado Cash sanctions, DeFi frontends need OFAC compliance. Most cannot afford enterprise tools. ChainEvidence gives you pre-transaction screening for pennies.
DeFi compliance is broken
OFAC Liability
After Tornado Cash, OFAC has made clear that DeFi frontends can face enforcement action. If your UI facilitates transactions with sanctioned addresses, you are exposed.
User Friction
Compliance tools that require KYC, account creation, or wallet whitelisting drive users away. DeFi users expect permissionless access -- not login walls.
Integration Complexity
Enterprise compliance solutions require months of integration, dedicated engineering resources, and ongoing maintenance. Most DeFi teams have 3-5 developers.
Cost
Chainalysis and TRM Labs charge $50,000-$200,000/year. For a DeFi protocol with no revenue model, that is not feasible. Most go without compliance entirely.
Compliance without compromise
One Script Tag
Add a single <script> tag to your frontend. No npm install, no build changes, no backend integration. Works with React, Vue, Svelte, or plain HTML.
Pre-Transaction Screening
Every eth_sendTransaction is intercepted and the destination address is screened against OFAC sanctions, scam databases, and risk scoring before the wallet prompt appears.
Block Sanctioned, Warn Risky
Three modes: "warn" shows a dismissible warning, "block-sanctioned" blocks OFAC addresses, "strict" blocks high-risk too. You choose your compliance posture.
$0.01 Per Check
5KB SDK with 5-minute client-side cache. Most DeFi frontends spend under $100/month. 99% cheaper than enterprise alternatives. 20 free checks included.
Add compliance in one line
<script
src="https://chainevidence.net/api/v1/sdk.js"
data-key="YOUR_API_KEY"
data-mode="block-sanctioned"
></script>
<!-- That's it. Every transaction is now screened.
Sanctioned addresses are blocked.
Risky addresses show a dismissible warning.
Clean addresses pass through instantly. -->What happens when a user tries to send to a flagged address:
Transaction proceeds normally. No modal. No delay.
Warning modal appears. User can review and proceed or cancel.
Transaction blocked. No "Proceed" button. OFAC compliance enforced.
5KB
SDK size (gzipped)
<50ms
Cached check latency
$0.01
Per check
0
Dependencies
Compliance should not cost more than your protocol earns
One script tag. $0.01 per check. Block sanctioned addresses, warn on risky ones, let clean transactions through instantly. 20 free checks to test.