Senda DApp

A frictionless, off-chain gateway to programmable money on Solana—combining prepaid cards, smart wallets and seamless remittances for underbanked users.

PROGRAMID: B3DT8RTGLr4k34jidDKKDYaLZcsveSmMVD7CWfvq8bgn

Features

• Custom Authentication: NextAuth.js–powered, extensible login flows
• Solana Wallet Integration: On-chain interactions via @solana/web3.js & Anchor
• Prepaid Card Off-Ramps: Withdraw to prepaid cards with minimal KYC
• Guest Wallet Support: Zero-touch onboarding for crypto novices
• Fiat On-Ramp (soon): Integrate Helio for seamless credit-card funding
• Modern UI: Tailwind CSS + Radix UI components, fully TypeScript-typed

Tech Stack

• Frontend: Next.js 15.x, React 19
• Styling: Tailwind CSS, Radix UI
• Auth: NextAuth v5
• API Layer: tRPC
• DB: Prisma + PostgreSQL
• Blockchain: Solana Web3.js, Anchor (Rust)
• State: Zustand
• Hosting: Vercel

Repository Layout

.
├── senda-dapp/           # Next.js frontend application
│   ├── pages/            # Next.js pages & API routes
│   ├── components/       # Reusable React components
│   ├── styles/           # Global & component styles
│   └── package.json
├── senda-smartc/         # Solana smart-contract (Rust + Anchor)
│   ├── programs/         # Anchor programs source
│   ├── migrations/       # Anchor deploy scripts
│   └── Cargo.toml
├── .gitignore
└── README.md             # This file

Getting Started

Prerequisites

• Node.js (v16+), Yarn or npm
• PostgreSQL (local or managed)
• Solana CLI (v1.14+)
• Anchor CLI (v0.27+)

Environment Variables

Copy the template and fill in your own values:

cp .env.example .env  # in both senda-dapp/ and senda-smartc/

Edit each .env:

# senda-dapp/.env
NEXT_PUBLIC_APP_URL=http://localhost:3000
NEXT_PUBLIC_SOLANA_NETWORK=devnet
NEXT_PUBLIC_RPC_URL=https://api.devnet.solana.com
SENDA_PROGRAM_ID=<YOUR_DEPLOYED_PROGRAM_ID>
# ...auth, DB, third-party keys...

# senda-smartc/.env
ANCHOR_WALLET=<path to your Anchor keypair>
CLUSTER_URL=https://api.devnet.solana.com

Frontend Setup

cd senda-dapp
yarn install
npx prisma generate
npx prisma migrate dev --name init
yarn dev

Open http://localhost:3000

Smart Contract Setup

cd senda-smartc
anchor build
anchor deploy

Copy the new program ID into senda-dapp/.env under SENDA_PROGRAM_ID.

Development

• yarn dev in senda-dapp: Start frontend & API
• anchor test in senda-smartc: Run on-chain tests
• yarn lint, yarn format: Code quality

Future Roadmap

• Fiat On-Ramp: full credit-card funding via Helio
• Mobile SDK: React Native library
• Analytics Dashboard: Remittance flow insights

Contributing

1. Fork the repo & create a feature branch
2. Commit with clear messages
3. Open a PR against main
4. Address review feedback