Understand every crypto
transaction before you sign
DeCypher intercepts transactions and translates complex smart contract calldata into clear, human-readable explanations in real time — powered by a local LLM that never shares your data.
Raw Transaction
0xa9059cbb000000000000000000000000deadbeef... ffffffffffffffffffffffffffffffffDeCypher Translation
⚠️ Critical Risk: You are granting unlimited spending permission to an unverified contract.
Try DeCypher in Real Time
Paste a transaction or contract to see how DeCypher explains it
Why This Matters
The risks of blind signing are real and growing every day.
Billions Lost to Exploits
Users unknowingly sign malicious contracts, leading to major financial losses.
Blind Signing is Standard
Wallets display unreadable transaction data, leaving users exposed.
Permissions are Dangerous
Unlimited token approvals can silently give full access to your assets.
Clarity Prevents Loss
Understanding transactions before signing is the most effective defense.
The problem with Web3 today
Every day, users lose millions to malicious transactions they didn't understand.
Blind Signing
Most users sign transactions without understanding what they're approving.
Confusing Code
Smart contract calldata is unreadable hex that hides critical details.
Financial Risk
One wrong signature can drain your entire wallet in seconds.
From cryptic to crystal clear
DeCypher transforms unreadable transaction data into plain English explanations you can trust.
// Transaction calldata
Function: approve(address,uint256)
// Parameters
spender: 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
amount: 115792089237316195423570985008687907853269984665640564039457584007913129639935
// What does this mean? Is this safe?
Broad Permission Request
Risk Level: Orange
Action: You are granting unlimited token spending permission.
To: Uniswap V2 Router (Verified ✓)
Token: USDC on Ethereum Mainnet
💡 Recommendation: Consider setting a specific amount instead of unlimited approval.
How it works
Three simple steps between you and complete transaction clarity.
Initiate Transaction
You click to sign a transaction in your wallet or dApp — business as usual.
Intercept & Decode
DeCypher intercepts the calldata and decodes it using on-chain contract ABIs.
Explain & Alert
A local LLM generates a plain English explanation with risk classification.
Color-coded risk alerts
Instantly understand the risk level of any transaction with our intuitive classification system.
Safe
Transaction follows expected patterns with no unusual permissions.
Example:
Standard token transfer to a known address
Expected
Some complexity detected, but within normal DeFi operations.
Example:
Swap on verified DEX with reasonable slippage
Broad
Wide permissions requested. Review carefully before signing.
Example:
Unlimited token approval to a protocol
Critical
High-risk pattern detected. Potential exploit or scam signature.
Example:
setApprovalForAll to unverified contract
More than beginner-friendly
DeCypher isn't just for newcomers. It's built for traders, DeFi power users, and anyone operating in high-stakes environments where understanding every transaction is critical.
Built for Traders
Decode complex multi-step swaps, flash loans, and arbitrage transactions instantly.
DeFi Native
Understand yield strategies, liquidity provisions, and protocol interactions at a glance.
Permission Clarity
See exactly what access you're granting — no more hidden approvals or unexpected delegations.
High-Stakes Ready
Reduce risk in time-sensitive environments where every signature matters.
Transaction Type
Flash Loan Arbitrage
Steps Detected
Built for Privacy and Security
Your data stays yours. Always.
Runs Locally
All transaction decoding happens on your device.
No Data Sharing
Wallet addresses and activity are never transmitted.
No Tracking
No analytics, no history stored, no surveillance.
Aligned with Web3 Principles
Full user control and transparency at every step.
Your keys, your data, your device
DeCypher runs a local LLM directly in your browser. Nothing is ever sent to external servers.
100% Local Processing
All AI inference runs on your device. No cloud APIs, no external servers.
No Data Transmission
Your wallet addresses, transactions, and balances never leave your browser.
Zero Tracking
No analytics, no telemetry, no user profiling. We don't know who you are.
No Storage
Transaction data is processed in memory and immediately discarded.
Open Source & Auditable
DeCypher's code is fully open source. Verify our privacy claims yourself — inspect every line of code that touches your transaction data.
Compatible with MetaMask, EVM chains, and major DeFi platforms
See it in action
This is what DeCypher looks like when it intercepts a transaction.
Uniswap V3: Router
Verified Contract ✓
Broad Permission
Risk Level: Orange
What this transaction does:
• Swaps 0.5 ETH for ~850 USDC
• Slippage tolerance: 0.5%
• Deadline: 20 minutes
💡 This swap uses multiple liquidity pools for better pricing.
Simple, transparent pricing
Start free and upgrade when you need more power. No hidden fees, no surprises.
Free
Essential protection for everyday users
- Basic transaction explanations
- Risk level classification
- Common contract detection
- Local AI processing
- Unlimited transactions
Pro
Advanced insights for serious traders
- Everything in Free
- Deep contract analysis
- Multi-step transaction breakdown
- Historical pattern matching
- Custom risk thresholds
- Priority model updates
- Advanced DeFi protocol support
Stop signing what you
don't understand
Join thousands of users who now understand every transaction before they sign. Install DeCypher and take control of your Web3 security.