About Senddy

Senddy is a privacy-preserving payment platform that lets you send, receive, and hold digital dollars privately. We use zero-knowledge cryptography to ensure your financial activity stays between you and your recipients—not visible to banks, advertisers, or even us.

Our mission is simple: make financial privacy accessible to everyone. Privacy shouldn't require technical expertise or expensive solutions. With Senddy, you get the same ease of use as Venmo or Cash App, with the privacy you deserve.

Senddy is built on Base, a Layer 2 network built on Ethereum by Coinbase. Your funds are secured by battle-tested smart contracts and can only be accessed by you.

When you deposit funds into Senddy, they are converted to USDC (a regulated US dollar stablecoin) and deposited into a secure pool contract. You receive private "share notes" that represent your balance. These notes are encrypted and can only be decrypted by you.

When you send money, a zero-knowledge proof is generated on your device. This proof mathematically verifies you have sufficient funds without revealing your actual balance, the transaction amount, or the recipient. The proof is verified on-chain, and the recipient receives their funds privately.

Your balance automatically earns yield from DeFi protocols. The interest is distributed to all depositors proportionally. You can withdraw your funds at any time—no lockups, no minimums.

The system is designed to be gasless. You don't need to hold ETH or any other token to pay for transactions. Fees are paid from your private balance, making transaction patterns harder to analyze.

Senddy uses zero-knowledge proofs (ZK proofs) to verify transactions without revealing sensitive information. ZK proofs are a cryptographic technique that allows one party to prove they know something without revealing what that something is.

When you make a transaction, your device generates a proof that: (1) you own the funds you're spending, (2) you have enough to cover the transaction, and (3) you're not double-spending. This proof reveals nothing else—not your balance, not the amount, not who you're sending to.

Our smart contracts are deployed on Base, Coinbase's Layer 2 network. Base inherits Ethereum's security while providing faster and cheaper transactions. All contracts are open source and have been audited by independent security firms.

We use a UTXO-style note system similar to Zcash. Each "note" represents a specific amount of value and can only be spent once. When you spend a note, it's destroyed and new notes are created for the recipient and any change.

Financial privacy is a fundamental right. Every transaction you make reveals information about your life—where you shop, what you earn, who you associate with. This data is collected, analyzed, and monetized by countless companies.

Senddy breaks this cycle. When you use Senddy, your transactions are cryptographically shielded. The blockchain records that a valid transaction occurred, but reveals nothing about who sent what to whom.

We can't see your balance. We can't see your transactions. We can't freeze your funds or block your payments. This isn't a policy choice—it's a technical guarantee enforced by cryptography.

Your private keys are generated and stored on your device. We never have access to them. Even if Senddy were compromised, attackers couldn't access your funds or transaction history.

Senddy is non-custodial. Your funds are held in smart contracts on Base, not in our bank accounts. The contracts are immutable—once deployed, even we can't modify them to access user funds.

Our zero-knowledge circuits and smart contracts have been audited by independent security researchers. All code is open source and available on GitHub for anyone to review.

We maintain a bug bounty program to incentivize security researchers to find and report vulnerabilities. Responsible disclosure is rewarded.

Your account is protected by your chosen authentication method—email, social login, or connected wallet. We recommend enabling all available security features and never sharing your login credentials.

Senddy supports multiple ways to add funds: bank transfers (ACH), debit and credit cards, Venmo, Cash App, and direct stablecoin deposits from any major blockchain network including Ethereum, Solana, and others.

When you deposit, your funds are converted to USDC and automatically shielded. The deposit transaction is visible on the blockchain, but once funds enter Senddy, all subsequent activity is private.

Withdrawals work in reverse. You can withdraw to any Ethereum-compatible address. The withdrawal amount is visible on-chain, but your remaining balance and previous transaction history remain private.

There are no minimum deposits or withdrawals. Standard network fees apply for on-chain transactions.

Your Senddy balance automatically earns yield. We deploy deposited funds to battle-tested DeFi protocols like Aave that generate interest from overcollateralized lending.

The yield is distributed to all Senddy users proportionally based on their share of the pool. You earn interest on your entire balance, whether it's $10 or $10,000.

Current yields are approximately 10x higher than traditional savings accounts. Rates vary based on market conditions and are updated in real-time in the app.

There are no lockup periods. You can withdraw your funds at any time and keep the yield you've earned. Interest accrues continuously and is reflected in your balance.

Senddy is free to use for basic features. There are no monthly fees, no minimum balance requirements, and no hidden charges.

Transactions within Senddy (sending to other Senddy users) have a small fee to cover the cost of proof verification on-chain. This fee is typically less than $0.01 and is paid from your private balance.

Deposits and withdrawals may incur standard blockchain network fees. These vary based on network congestion and are shown before you confirm the transaction.

Fiat on-ramps (bank transfers, card payments) may have fees charged by our payment processing partners. These are disclosed at the time of deposit.

Senddy is designed to provide financial privacy for legitimate use. We are committed to complying with applicable laws and regulations while preserving user privacy to the maximum extent possible.

Privacy is not anonymity. While your transactions are private by default, Senddy is not designed to facilitate illegal activity. We cooperate with law enforcement when presented with valid legal process.

Users are responsible for complying with the laws of their jurisdiction. Senddy may not be available in all countries or regions.

For questions about our legal policies, please review our Terms of Service and Privacy Policy, or contact us at legal@senddy.com.

General inquiries: hello@senddy.com

Security issues: security@senddy.com