SkillNet

The Skill & Tool Marketplace for AI Agents and Developers — Payments on Stellar via x402

SkillNet is a marketplace where developers buy and sell pre-built AI agent skills with instant USDC micropayments on Stellar. No subscriptions. No billing forms. No platform middleman. Just skills.

Built for the Stellar x402 Hackathon — April 2026.

Live Demo: https://skillnet-lilac.vercel.app/

What is SkillNet?

Think npm meets Gumroad, but for AI agent skills.

Developers sell pre-built capabilities web scrapers, crypto price fetchers, blockchain tools, AI wrappers as downloadable skill packages. Buyers pay a small USDC fee per download using the x402 HTTP payment protocol on Stellar. The payment settles in under 5 seconds. The seller gets paid directly to their Stellar wallet. The platform takes zero cut.

The marketplace has two entrances:

Human door — a clean React UI for browsing, buying and listing skills
Agent door — a REST API that AI agents call autonomously to discover and purchase skills without human involvement

The x402 Flow

Buyer clicks Buy Now on a skill
Frontend calls /api/download?id=skill-id
Server responds with HTTP 402 Payment Required + price + seller Stellar address
Freighter wallet popup appears — buyer confirms payment
USDC transfers on Stellar testnet in ~5 seconds
Frontend sends transaction hash back to server
Server verifies payment on Stellar testnet
Server releases the skill download URL
Zip file downloads to buyer's computer

For AI agents — steps 4 and 5 happen automatically. No human approval. No popup. The agent pays from its own Stellar wallet within pre-set spending limits.

Demo — Autonomous Agent

SkillNet includes a standalone Node.js agent script that demonstrates fully autonomous skill acquisition:

cd agent
node index.js Crypto
node index.js Blockchain "Wallet Balance Checker"
node index.js AI "Document Summarizer"
node index.js Backend "CAC Company Lookup"

The agent:

Queries the SkillNet API to discover skills
Selects the best rated skill in the category
Calls the x402 download endpoint
Receives HTTP 402 with payment details
Automatically builds, signs and submits a Stellar USDC transaction
Sends the transaction hash back for verification
Receives the skill and executes it
Delivers a report — all without human input

Tech Stack

Layer	Tool
Frontend	React + Vite
Styling	Tailwind CSS v4
UI Components	shadcn/ui
Animations	Framer Motion
Routing	React Router v6
Database	Supabase (PostgreSQL)
File Storage	Supabase Storage
Backend API	Vercel Serverless Functions
Payments	x402 Protocol + Stellar Testnet
Payment Currency	USDC on Stellar Testnet
Wallet	Freighter Browser Extension
Stellar SDK	@stellar/stellar-sdk v15
Deployment	Vercel

Pages

Route	Description
`/`	Home — hero, stats, how it works, categories, featured skills
`/catalog`	Browse all skills — search, category filter, skill cards
`/skills/:id`	Skill detail — full description, price, download button
`/list-skill`	Seller form — list a new skill for sale
`/dashboard`	Seller dashboard — earnings, downloads, listed skills

API Routes

Endpoint	Method	Description
`/api/skills`	GET	Returns all skills. Accepts `?category=` filter
`/api/skill`	GET	Returns single skill. Requires `?id=`
`/api/categories`	GET	Returns all categories with skill counts
`/api/download`	GET	x402 payment gate. Returns 402 or download URL
`/api/list-skill`	POST	Saves new skill listing to database
`/api/dashboard`	GET	Returns seller stats. Requires `?address=`
`/api/build-transaction`	POST	Builds Stellar payment transaction XDR
`/api/submit-transaction`	POST	Submits signed transaction to Stellar testnet

Skill Categories

SkillNet has 8 categories:

Blockchain — smart contract readers, wallet checkers, transaction analyzers
Crypto — price fetchers, fear & greed index, DeFi yield scanners
AI — prompt optimizers, document summarizers, sentiment analyzers
Web3 — ENS resolvers, NFT metadata fetchers, IPFS content fetchers
Frontend — React component generators, CSS tools, layout analyzers
Backend — API health checkers, web scrapers, database schema generators
Product Design — persona generators, feature matrices, UX copy writers
DeFi — Stellar and DeFi specific tools

Mock Data Disclosure

This project was built for a hackathon with a 2-week deadline. The following data is mock/seeded and not real:

24 skill listings — seeded directly into Supabase with realistic names, descriptions, prices, ratings and download counts. These are not real submissions from real developers.
Seller addresses — all 24 skills have been assigned a single test Stellar wallet address for payment testing purposes. In production, each seller would have their own unique address.
Skill zip files — 6 real zip files were created and uploaded to Supabase Storage for the payment demo. The remaining 18 skills have no file attached (file_url: null).
Download counts and ratings — hardcoded realistic numbers to make the catalog look populated.
Stats bar — Total Skills (24), Active Sellers (12) are hardcoded. Total Downloads is calculated from the seeded data.

Everything else is real and functional:

x402 payment flow is real and fires on Stellar testnet
Stellar transactions are real and verifiable on the Stellar testnet explorer
Supabase database is live and connected
Seller form saves real listings to the database
Wallet connection uses real Freighter extension
Agent script makes real Stellar payments

Setup and Installation

Prerequisites

Node.js 18+
Vercel CLI (npm install -g vercel)
Freighter browser extension installed and set to Testnet
Supabase account
Stellar testnet wallet with USDC

1. Clone the repo

git clone https://github.com/Prudentdev-xyz/skillnet.git
cd skillnet

2. Install dependencies

npm install

3. Set up environment variables

Create a .env file in the root:

VITE_SUPABASE_URL=your_supabase_url
VITE_SUPABASE_ANON_KEY=your_supabase_anon_key
SUPABASE_URL=your_supabase_url
SUPABASE_SERVICE_ROLE_KEY=your_supabase_service_role_key

4. Set up Supabase

Create two tables in your Supabase project:

create table skills (
  id uuid default gen_random_uuid() primary key,
  name text not null,
  short_description text not null,
  full_description text not null,
  category text not null,
  price_usdc numeric(10, 4) not null,
  seller_address text not null,
  file_url text,
  downloads integer default 0,
  rating numeric(3, 2) default 0,
  created_at timestamp with time zone default now()
);

create table sellers (
  id uuid default gen_random_uuid() primary key,
  stellar_address text unique not null,
  total_earnings numeric(10, 4) default 0,
  total_downloads integer default 0,
  created_at timestamp with time zone default now()
);

Create a Supabase Storage bucket called skill-files and set it to public.

5. Run locally

vercel dev

App runs at http://localhost:3000

6. Run the agent script

cd agent
npm install

Create agent/.env:

AGENT_STELLAR_SECRET=your_agent_stellar_secret_key
SKILLNET_API_URL=http://localhost:3000

Run:

node index.js Crypto

Stellar Testnet Details

Network: Stellar Testnet
USDC Issuer: GBBD47IF6LWK7P7MDEVSCWR7DPUWV3NY3DTQEVFL4NAT4AQH3ZLLFLA5
Horizon: https://horizon-testnet.stellar.org
Explorer: https://stellar.expert/explorer/testnet
Friendbot (free XLM): https://friendbot.stellar.org/?addr=YOUR_ADDRESS
USDC Faucet: https://faucet.circle.com

x402 Protocol

SkillNet implements the x402 HTTP payment standard manually:

Client requests a resource
Server returns 402 Payment Required with payment details in JSON
Client reads the payment details and initiates a Stellar USDC transaction
Client sends the transaction hash back in the x-payment-txhash header
Server verifies the transaction on Stellar testnet
Server releases the resource

This is the core primitive that enables AI agents to pay for resources autonomously — no human approval, no API keys, no subscriptions.

Project Structure

skillnet/
├── agent/                    # Autonomous agent demo script
│   ├── index.js              # Main agent script
│   ├── .env                  # Agent environment variables
│   └── package.json
├── api/                      # Vercel serverless functions
│   ├── supabase.js           # Backend Supabase client
│   ├── skills.js             # GET /api/skills
│   ├── skill.js              # GET /api/skill
│   ├── categories.js         # GET /api/categories
│   ├── download.js           # x402 payment gate
│   ├── list-skill.js         # POST /api/list-skill
│   ├── dashboard.js          # GET /api/dashboard
│   ├── build-transaction.js  # POST /api/build-transaction
│   └── submit-transaction.js # POST /api/submit-transaction
├── src/
│   ├── components/
│   │   ├── shared/
│   │   │   ├── Navbar.jsx
│   │   │   ├── Footer.jsx
│   │   │   ├── BuyButton.jsx
│   │   │   ├── PageWrapper.jsx
│   │   │   └── ScrollToTop.jsx
│   │   └── ui/               # shadcn components
│   ├── context/
│   │   └── WalletContext.jsx
│   ├── hooks/
│   │   └── usePayment.js
│   ├── lib/
│   │   └── supabase.js
│   ├── pages/
│   │   ├── Home.jsx
│   │   ├── Catalog.jsx
│   │   ├── SkillDetail.jsx
│   │   ├── ListSkill.jsx
│   │   └── Dashboard.jsx
│   ├── App.jsx
│   └── main.jsx
├── .env
├── vercel.json
└── README.md

Hackathon Resources

License

MIT — built for the Stellar x402 Hackathon, April 2026.

Skills for developers. Tools for agents. Payments on Stellar.

Name		Name	Last commit message	Last commit date
agent		agent
api		api
public		public
src		src
.env		.env
.gitignore		.gitignore
README.md		README.md
components.json		components.json
eslint.config.js		eslint.config.js
index.html		index.html
jsconfig.json		jsconfig.json
package-lock.json		package-lock.json
package.json		package.json
vercel.json		vercel.json
vite.config.js		vite.config.js

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SkillNet

What is SkillNet?

The x402 Flow

Demo — Autonomous Agent

Tech Stack

Pages

API Routes

Skill Categories

Mock Data Disclosure

Setup and Installation

Prerequisites

1. Clone the repo

2. Install dependencies

3. Set up environment variables

4. Set up Supabase

5. Run locally

6. Run the agent script

Stellar Testnet Details

x402 Protocol

Project Structure

Hackathon Resources

License

About

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SkillNet

What is SkillNet?

The x402 Flow

Demo — Autonomous Agent

Tech Stack

Pages

API Routes

Skill Categories

Mock Data Disclosure

Setup and Installation

Prerequisites

1. Clone the repo

2. Install dependencies

3. Set up environment variables

4. Set up Supabase

5. Run locally

6. Run the agent script

Stellar Testnet Details

x402 Protocol

Project Structure

Hackathon Resources

License

About

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