Introduction
Senddy is the privacy layer for onchain apps. Add private payments, swaps and yield with one SDK, and earn on every transaction.
What is Senddy?#
Senddy is the privacy layer for onchain apps. Add it to your app and your users can send, swap and earn with their balances and activity kept off the public ledger. They don't learn anything new, and they never hold gas.
You integrate one SDK. You set a fee on transfers, swaps, deposits and withdrawals, and it's paid to your address automatically.
Users can deposit and withdraw on Base, Ethereum, Solana, Arbitrum, Optimism, Polygon, BNB Chain, Avalanche, Hyperliquid and Robinhood Chain, and withdraw to Lighter. Private balances are held on Base and Robinhood Chain.
Start building#
- Build with Senddy: what you can build, and which guide to read first
- Quickstart: a private transfer running in five minutes
- Choose a chain: Base or Robinhood Chain, and what each one supports
Guides by job#
| I want to… | Read |
|---|---|
| Let users pay and get paid privately | Accept and send private payments |
| Let users trade without showing their balance | Add private swaps |
| Let balances earn while they sit | Earn yield on balances |
| Earn on my users' activity | Set your fee |
| Get money in from other chains, and back out | Move money in and out |
| Ship it in a browser app | Build a web app |
| Run payments from a server or an AI agent | Run a payments agent |
How it works, briefly#
Balances live in a shared privacy pool as encrypted notes. Every send, swap and withdrawal is a zero-knowledge proof made on the user's device: the network checks that it's valid without learning the amount, the balance or who paid whom. A secure enclave verifies the proof and a relayer submits it, so users never need gas.
Read How privacy works for the full picture.
Using the Senddy app#
Senddy is also an app built on the same layer. If you're here as a user, start with Getting started.