# Developer Overview

> Private payments infrastructure. 0% per transaction. Integrate in an afternoon.

Source: https://www.senddy.com/docs/developers
Last modified: 2026-08-01T23:49:54.000Z

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## Why Senddy for developers?

Senddy gives you a payments API with three things no other provider offers simultaneously:

### Privacy by default

Every payment is processed using zero-knowledge proofs. Your customers' transaction data never touches your servers, is never stored in a database, and is never at risk of a breach. You can't leak what you don't have.

### No per-transaction fee

| | Stripe | Senddy |
|---|---|---|
| **Transaction fee** | 2.9% + $0.30 | **0%** |
| **On a $100 payment** | $3.20 | **Under $0.01** |
| **Settlement** | 2 business days | **Instant** |
| **International** | +1.5% | **Included** |

Senddy takes no percentage of payment volume. You cover Base network cost, which
runs under a cent per transfer, and relaying is gas-sponsored. Revenue comes from
[API plans](/docs/developers/pricing) instead of transaction fees.

### Familiar developer experience

Typed TypeScript SDKs for the browser, the server and AI agents, plus a REST API
with separate test and live keys.

## What you can build

- **E-commerce checkout** — Accept private payments at your online store
- **Subscription billing** — Recurring private payments
- **Payroll** — Pay employees and contractors privately
- **Creator payments** — Tips, donations, and subscriptions
- **Cross-border payments** — Instant international transfers with no fees
- **Treasury management** — Hold and manage funds privately with yield

## Available tools

| Tool | Description |
|---|---|
| **@senddy/core** | Keys, notes, Merkle cache and proof witnesses |
| **@senddy/client** | Transfers, deposits and withdrawals, orchestrated over viem |
| **@senddy/node** | Headless client for servers and AI agents |
| **REST API** | Balances, attestation and gas-sponsored relaying over HTTP |

`@senddy/sdk` is deprecated and has been split into `@senddy/core` and
`@senddy/client`.

### On the roadmap

Not built yet — see [ROADMAP](https://github.com/senddy) before designing
against these:

| Tool | Status |
|---|---|
| **React hooks** (`@senddy/react`) | Planned |
| **wagmi bindings** (`@senddy/wagmi`) | Example code only |
| **Webhooks** | Planned |
| **Embeddable checkout** | Planned |
| **Shopify app** | Example code only |

## Next steps

- [Quickstart](/docs/developers/quickstart) — Get a working integration in 5 minutes
- [SDK Reference](/docs/developers/sdk) — Full SDK documentation
- [Pricing](/docs/developers/pricing) — Plans and pricing