Hazina Data Escrow

Hazina means treasure in Swahili.

A Web3 data marketplace where sellers list valuable on-chain intelligence and buyers — including autonomous AI agents — purchase access using micropayments on Stellar. A Soroban smart contract enforces escrow on-chain. Claude AI synthesises every dataset into instant insights.

What Problem Does Hazina Solve?

AI agents can't pay for data they need. When an autonomous agent requires paid on-chain intelligence, it hits a wall — rate limits, waiting for a human to set up a subscription, or going without. Meanwhile, data creators can't charge per-use because traditional payment rails ($0.30 minimum fees) make micropayments impossible.

Hazina fixes both sides:

Agents autonomously discover and pay for data via x402 micropayments on Stellar — no human needed.
Sellers earn USDC per query at fractions of a cent, enforced by a Soroban smart contract.

Soroban Smart Contract

The Hazina escrow contract is written in Rust, compiled to WebAssembly, and deployed on the Stellar Soroban smart contract platform.

Deployed Contract


Contract ID	`CCPG2CSL6WDUA2IFUDHFN5SCJQUTFCLFKMTARALQ5RWGB2RGG345HEEH`
Network	Stellar Testnet
Explorer	View on Stellar Expert
Admin	`GA72WMKUB52OD2X437YOTJZXP3J7MV5G2RYC2JHFJJHWF6MBGQHVUMLO`
Platform Fee	Default 5% (500 basis points), configurable per dataset
Source	`contracts/hazina-escrow/src/lib.rs`

What the Contract Does

The contract is a trustless escrow — it holds a buyer's USDC payment and only releases it when the Hazina backend confirms data delivery. Neither the buyer nor the seller can cheat:

Buyer           Contract              Seller
  │                │                    │
  │──lock(USDC)──► │                    │
  │                │  (funds held       │
  │                │   on-chain)        │
  │                │                    │
  │         [Backend verifies           │
  │          data was delivered]        │
  │                │                    │
  │                │──release(95%)────► │
  │                │──platform fee────► Admin

Contract Functions

Function	Who Calls It	What It Does
`initialize(admin, fee_bps)`	Deployer (once)	Sets the admin address and default platform fee (500 = 5%)
`set_default_fee(admin, fee_bps)`	Hazina backend (admin)	Updates the fallback fee used when no dataset override exists
`set_dataset_fee(admin, dataset_id, fee_bps)`	Hazina backend (admin)	Sets a custom platform fee for a specific dataset
`clear_dataset_fee(admin, dataset_id)`	Hazina backend (admin)	Removes a dataset-specific fee override
`set_whitelist_enforced(admin, enforced)`	Hazina backend (admin)	Toggles whitelist mode for participant addresses
`set_address_whitelisted(admin, address, whitelisted)`	Hazina backend (admin)	Marks an address as whitelist-approved
`set_address_blacklisted(admin, address, blacklisted)`	Hazina backend (admin)	Blocks or unblocks a malicious address
`lock(buyer, seller, token, amount, dataset_id)`	Buyer	Transfers USDC from buyer into the contract. Returns an `escrow_id`.
`release(admin, escrow_id)`	Hazina backend (admin)	Sends 95% to seller, 5% to admin. Fires a `released` event.
`refund(admin, escrow_id)`	Hazina backend (admin)	Returns full amount to buyer if something goes wrong.
`get_escrow(escrow_id)`	Anyone	Reads an escrow record (buyer, seller, amount, status).
`get_fee()`	Anyone	Returns the default platform fee in basis points.
`get_dataset_fee_config(dataset_id)`	Anyone	Returns the effective fee config for a dataset override.
`get_address_policy(address)`	Anyone	Returns whitelist and blacklist status for an address.

Why Soroban?

On-chain enforcement — the payment routing (95/5 split) is code, not promises.
Trustless — buyers don't have to trust the Hazina server to route their money correctly.
Auditable — every lock, release, and refund emits an on-chain event visible to anyone.
Native USDC — operates directly on Stellar's USDC, same asset as the x402 payments.

Building & Deploying the Contract

# Install Stellar CLI
brew install stellar-cli

# Build
cd contracts/hazina-escrow
stellar contract build

# Add your keypair
stellar keys add hazina-admin --secret-key

# Deploy to testnet
stellar contract deploy \
  --wasm target/wasm32v1-none/release/hazina_escrow.wasm \
  --source hazina-admin \
  --network testnet

# Initialise (run once after deploy)
stellar contract invoke \
  --id <CONTRACT_ID> \
  --source hazina-admin \
  --network testnet \
  -- initialize \
  --admin <YOUR_WALLET> \
  --platform_fee_bps 500

Verification Scripts

npm run contracts:check
npm run contracts:formal

contracts:check runs cargo fmt --check, cargo clippy, the full Rust test suite, and a release wasm build.
contracts:formal runs the invariant-oriented contract tests prefixed with formal_.

How the App Works

Step 1 — Seller Lists Data

Seller → /sell page
  → Name, description, price, Stellar wallet address, JSON data
  → Click "Publish to Marketplace"
  → Dataset live instantly, earnings tracked per query

Step 2 — Buyer Finds a Dataset

Buyer → /marketplace
  → Filter by type (whale wallets, DeFi yields, sentiment, risk scores…)
  → Click "Buy Query" on any dataset
  → Modal shows price, seller wallet, payment instructions

Step 3 — The x402 Payment Flow

Browser                    Backend                  Stellar
  │                           │                        │
  │  POST /api/query/:id       │                        │
  │ ─────────────────────────► │                        │
  │                           │                        │
  │ ◄───────────────────────── │                        │
  │  402 { address, amount,   │                        │
  │         memo, expiresIn } │                        │
  │                           │                        │
  │  [Buyer sends USDC]        │                        │
  │ ──────────────────────────────────────────────────►│
  │                           │                        │
  │  POST /api/verify/:id      │                        │
  │  { txHash }               │                        │
  │ ─────────────────────────► │                        │
  │                           │  Horizon API check     │
  │                           │ ──────────────────────►│
  │                           │ ◄────────────────────── │
  │                           │  Payment confirmed ✓   │
  │                           │                        │
  │                           │  [Claude AI summary]   │
  │                           │  [Auto-pay seller 95%] │
  │                           │ ──────────────────────►│
  │                           │                        │
  │ ◄───────────────────────── │                        │
  │  200 { data, AI summary,  │                        │
  │   sellerTxHash }          │                        │

Security checks on every payment:

Transaction exists and is confirmed on Stellar
Payment destination is the correct escrow wallet
Amount is exactly right (within 0.001 USDC tolerance)
Memo matches this specific query (prevents payment reuse)
Transaction is less than 5 minutes old
Transaction hash has never been used before (replay attack prevention)

Step 4 — Data + AI Delivered

Buyer receives:
  ✓ Full raw dataset (JSON, downloadable)
  ✓ Claude AI executive summary (3 key insights)
  ✓ Answer to their custom question
  ✓ On-chain proof of seller payment (sellerTxHash)

Step 5 — Seller Paid Automatically

Every verified purchase:
  → 95% → seller's Stellar wallet (on-chain, immediate)
  → 5%  → platform escrow wallet
  → Stats updated (queriesServed, totalEarned)
  → Transaction logged for /dashboard

AI Research Agent

The flagship feature. An autonomous agent that buys data from multiple sellers and synthesises a research report — with no human in the loop.

How It Works

User pays 1 USDC to agent escrow wallet
  │
  ▼
Agent verifies payment on Stellar (real tx)
  │
  ▼
Agent autonomously pays 4 data sellers via x402:
  ├── DeFi Yield Snapshot     →  0.02 USDC
  ├── Whale Wallet Movements  →  0.05 USDC
  ├── Wallet Risk Scores      →  0.03 USDC
  └── Social Sentiment        →  0.04 USDC
  │
  ▼
Claude synthesises all 4 datasets into a research report:
  ├── Top opportunity (protocol, APY, chain, risk level)
  ├── Reasoning (cross-referencing all 4 data sources)
  ├── 2 alternative opportunities
  └── Risk warnings
  │
  ▼
Agent keeps 0.86 USDC profit

Agent Endpoints

Endpoint	Description
`GET /api/agent/info`	Agent wallet address, fee, seller list, profit model
`POST /api/agent/research`	Real mode — requires 1 USDC Stellar payment + txHash
`POST /api/agent/research/demo`	Demo mode — simulates payments, calls Claude for real

Example Query

curl -X POST http://localhost:3001/api/agent/research/demo \
  -H "Content-Type: application/json" \
  -d '{"query": "best low risk USDC yield with $500 budget"}'

Returns a full JSON research report with top opportunity, reasoning, alternatives, and warnings.

Tech Stack

Layer	Technology	What It Does
Frontend	React 18 + Vite + TypeScript	Marketplace, sell, dashboard, agent UI
Styling	TailwindCSS	Afrofuturist dark gold theme
Backend	Node.js + Express + TypeScript	API server, payment verification, agent orchestration
Smart Contract	Rust + Soroban (WebAssembly)	On-chain escrow, trustless payment routing
Blockchain	Stellar Testnet + x402 protocol	Micropayments, USDC settlement
AI	Anthropic Claude (`claude-sonnet-4-6`)	Data analysis + research synthesis
Storage	JSON file (`data/datasets.json`)	Datasets and transaction history

Project Structure

Hazina-Escrow/
│
├── contracts/                           ← Soroban smart contracts (Rust)
│   └── hazina-escrow/
│       ├── Cargo.toml                   ← Rust package config
│       └── src/lib.rs                   ← Escrow contract: lock/release/refund
│
├── backend/                             ← Node.js API server (port 3001)
│   ├── .env                             ← API keys, wallet secrets, contract ID
│   └── src/
│       ├── main.ts                      ← Express setup, routes
│       ├── common/
│       │   └── storage.ts               ← Reads/writes data/datasets.json
│       ├── datasets/
│       │   └── datasets.router.ts       ← List, create, get datasets
│       ├── payments/
│       │   ├── payments.router.ts       ← x402 flow + seller auto-payment
│       │   └── stellar.service.ts       ← Stellar Horizon payment verification
│       ├── agent/
│       │   ├── agent.router.ts          ← /api/agent/* endpoints
│       │   ├── agent.service.ts         ← Orchestrates: verify → buy → synthesise
│       │   └── agent.wallet.ts          ← Signs & sends USDC from agent keypair
│       └── ai/
│           ├── claude.service.ts        ← Dataset summaries for marketplace
│           └── research.service.ts      ← Full research report synthesis
│
├── frontend/                            ← React app (port 5173)
│   └── src/
│       ├── App.tsx                      ← Routing
│       ├── pages/
│       │   ├── LandingPage.tsx          ← Hero, stats, how-it-works
│       │   ├── MarketplacePage.tsx      ← Browse, filter, buy datasets
│       │   ├── SellPage.tsx             ← Upload data, set price, publish
│       │   ├── DashboardPage.tsx        ← Earnings & transaction history
│       │   └── AgentPage.tsx            ← AI research agent UI
│       ├── components/
│       │   ├── layout/Navbar.tsx        ← Navigation
│       │   └── ui/
│       │       ├── DatasetCard.tsx      ← Dataset cards in marketplace
│       │       └── QueryModal.tsx       ← Payment flow modal
│       └── lib/
│           ├── api.ts                   ← Typed API client (datasets + agent)
│           └── utils.ts                 ← Formatting helpers
│
├── data/
│   └── datasets.json                    ← 6 seeded datasets + 42 transactions
│
└── README.md

Getting Started

Prerequisites

Node.js 18+
Anthropic API key — console.anthropic.com
Rust + stellar-cli (only needed to rebuild the contract)

1. Install dependencies

npm run install:all

2. Configure environment

Edit backend/.env:

PORT=3001
FRONTEND_URL=http://localhost:5173

# Required
ANTHROPIC_API_KEY=sk-ant-...

# Escrow wallet (receives buyer payments, forwards to sellers)
ESCROW_WALLET=GA72WMKUB52OD2X437YOTJZXP3J7MV5G2RYC2JHFJJHWF6MBGQHVUMLO
ESCROW_SECRET=your_escrow_wallet_secret_here

# Agent wallet (pays data sellers autonomously)
AGENT_WALLET_SECRET=your_agent_wallet_secret_here
AGENT_WALLET_PUBLIC=your_agent_wallet_public_key_here

# Soroban escrow contract (Stellar Testnet)
ESCROW_CONTRACT_ID=CCPG2CSL6WDUA2IFUDHFN5SCJQUTFCLFKMTARALQ5RWGB2RGG345HEEH

PLATFORM_FEE=0.05

3. Start the app

# Terminal 1 — Backend
cd backend && npm run start:dev

# Terminal 2 — Frontend
cd frontend && npm run dev

Backend: http://localhost:3001
Frontend: http://localhost:5173

4. Test without a real wallet

Every dataset has demo mode — in the buy modal, tick "Demo mode" to get a full Claude AI analysis without sending a real Stellar payment.

The AI Agent also has demo mode — go to /agent, type any query, click Run Agent.

Run with Docker

Prerequisites

Docker Desktop (or Docker Engine + Compose plugin)
A configured backend/.env file

Development (hot reload)

docker compose up --build

Frontend (Vite HMR): http://localhost:5173
Backend API: http://localhost:3001
Backend uses backend/.env via env_file
data/datasets.json is bind-mounted to /app/data/datasets.json so data persists across container restarts

Production-style local run

docker compose -f docker-compose.prod.yml up --build

Frontend is built and served by nginx on http://localhost
nginx proxies /api/* traffic to the backend container
Backend is compiled with tsc and run via node dist/main.js

Stop containers

docker compose down
docker compose -f docker-compose.prod.yml down

Pages & Features

`/` — Landing Page

Live animated stats (datasets, queries, USDC earned)
How It Works walkthrough
Featured datasets
Links to marketplace and agent

`/marketplace` — Browse & Buy

6 seeded datasets (whale wallets, DeFi yields, risk scores, sentiment, NFT, arbitrage)
Filter by type, sort by price/popularity, search
Click any card → payment modal with demo mode checkbox

`/sell` — List Your Data

Form: name, description, type, price, Stellar wallet, JSON data
Live preview card
Earnings calculator (10 / 100 / 1000 query projections)
Instant publish to marketplace

`/agent` — AI Research Agent

Natural language query input
Example queries to click
Returns: top opportunity, reasoning, 2 alternatives, warnings, full analysis
Shows payment trail (4 seller payments + agent profit)

`/dashboard` — Earnings & History

Real-time transaction list
Per-dataset earnings
Queries served counter

API Reference

Datasets

Method	Endpoint	Description
`GET`	`/health`	Server health check
`GET`	`/api/datasets`	All datasets (metadata only)
`GET`	`/api/datasets/stats`	Platform totals
`GET`	`/api/datasets/:id`	Single dataset metadata
`POST`	`/api/datasets`	Create new listing
`GET`	`/api/datasets/:id/transactions`	Transaction history

Payments (x402)

Method	Endpoint	Description
`POST`	`/api/query/:id`	Initiate query → 402 with payment instructions
`POST`	`/api/verify/:id`	Submit txHash → verify on Stellar → release data + pay seller
`POST`	`/api/verify/:id/demo`	Demo mode — skip payment, get AI analysis

AI Agent

Method	Endpoint	Description
`GET`	`/api/agent/info`	Agent wallet, fee, sellers, profit model
`POST`	`/api/agent/research`	Real mode — requires txHash of 1 USDC payment
`POST`	`/api/agent/research/demo`	Demo mode — simulated payments, real Claude synthesis

Payment Flow Deep Dive

What is x402?

HTTP's 402 Payment Required status code — defined in 1991, never widely used until now. Hazina implements it as a machine-readable payment protocol: any client (browser or AI agent) receives structured payment instructions and can act on them without human intervention.

Why Stellar?

3–5 second finality — no waiting for confirmations
$0.00001 fees — viable for $0.02 micropayments
Native USDC — stable, no price volatility
Soroban — WebAssembly smart contracts in any language

Seller Payment Flow (Real Mode)

1. Buyer sends 0.05 USDC to escrow wallet on Stellar (via Freighter)
2. Buyer submits txHash to POST /api/verify/:id
3. Backend checks Horizon API: amount ✓ destination ✓ memo ✓ expiry ✓
4. Claude generates AI summary of the dataset
5. Backend sends 0.0475 USDC → seller wallet (on-chain, new tx)
6. Response includes: data + AI summary + sellerTxHash

Agent Payment Flow (Real Mode)

1. User sends 1 USDC to agent escrow wallet
2. POST /api/agent/research { query, txHash }
3. Agent verifies incoming payment on Stellar
4. Agent signs 4 outgoing Stellar transactions (one per seller)
5. Claude synthesises all 4 datasets into research report
6. Response: report + payment trail (4 txHashes) + agent profit

Seeded Datasets

ID	Dataset	Price	Seller Wallet
ds-001	Top 100 Whale Wallet Movements	$0.05	`GB37MSLK...`
ds-002	DEX Arbitrage Signals — Last 24hrs	$0.10	`GA62DGF2...`
ds-003	DeFi Yield Snapshot — 20+ Protocols	$0.02	`GD4GDOPE...`
ds-004	Wallet Risk Scores — Top 500 DeFi Wallets	$0.03	`GBMVCBYW...`
ds-005	NFT Floor Price Movements — Last 7 Days	$0.02	`GCDDN2PN...`
ds-006	Crypto Social Sentiment Scores	$0.04	`GC42G7GQ...`

All seller wallets are funded Stellar testnet accounts with USDC trustlines, ready to receive payments.

Environment Variables

Variable	Required	Description
`ANTHROPIC_API_KEY`	Yes	Claude API key — console.anthropic.com
`ESCROW_WALLET`	Yes	Stellar address that receives buyer payments
`AGENT_WALLET_SECRET`	Yes	Agent's Stellar secret key (signs outgoing seller payments)
`AGENT_WALLET_PUBLIC`	No	Agent's Stellar public key (display only)
`ESCROW_CONTRACT_ID`	No	Soroban contract address (for on-chain escrow integration)
`PLATFORM_FEE`	No	Platform cut as decimal (default: 0.05)
`PORT`	No	API port (default: 3001)
`FRONTEND_URL`	No	CORS origin (default: http://localhost:5173)

Design

Afrofuturist aesthetic — luxury dark theme inspired by the Kente cloth geometric patterns of West Africa. The name Hazina (treasure in Swahili) reflects the untapped value in on-chain intelligence.

Token	Value
Background	`#0A0A0F` (void black)
Accent	`#C9A84C` (gold)
Heading font	Playfair Display
Body font	DM Sans
Cards	Glass morphism with gold borders
Patterns	Kente-inspired SVG geometry

Name		Name	Last commit message	Last commit date
Latest commit History 87 Commits
.cargo-home		.cargo-home
.claude		.claude
.github		.github
.husky		.husky
.vscode		.vscode
backend		backend
contracts/hazina-escrow		contracts/hazina-escrow
data		data
docs		docs
frontend		frontend
pulumi		pulumi
scripts/contracts		scripts/contracts
src		src
terraform		terraform
.codex		.codex
.env.example		.env.example
.gitignore		.gitignore
.prettierignore		.prettierignore
.prettierrc		.prettierrc
CONTRIBUTING.md		CONTRIBUTING.md
Cargo.lock		Cargo.lock
Cargo.toml		Cargo.toml
README.md		README.md
codecov.yml		codecov.yml
docker-compose.prod.yml		docker-compose.prod.yml
docker-compose.yml		docker-compose.yml
eslint.config.mjs		eslint.config.mjs
package-lock.json		package-lock.json
package.json		package.json
prettier.config.mjs		prettier.config.mjs

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Hazina Data Escrow

Table of Contents

What Problem Does Hazina Solve?

Soroban Smart Contract

Deployed Contract

What the Contract Does

Contract Functions

Why Soroban?

Building & Deploying the Contract

Verification Scripts

How the App Works

Step 1 — Seller Lists Data

Step 2 — Buyer Finds a Dataset

Step 3 — The x402 Payment Flow

Step 4 — Data + AI Delivered

Step 5 — Seller Paid Automatically

AI Research Agent

How It Works

Agent Endpoints

Example Query

Tech Stack

Project Structure

Getting Started

Prerequisites

1. Install dependencies

2. Configure environment

3. Start the app

4. Test without a real wallet

Run with Docker

Prerequisites

Development (hot reload)

Production-style local run

Stop containers

Pages & Features

/ — Landing Page

/marketplace — Browse & Buy

/sell — List Your Data

/agent — AI Research Agent

/dashboard — Earnings & History

API Reference

Datasets

Payments (x402)

AI Agent

Payment Flow Deep Dive

What is x402?

Why Stellar?

Seller Payment Flow (Real Mode)

Agent Payment Flow (Real Mode)

Seeded Datasets

Environment Variables

Design

About

Resources

Contributing

Stars

Watchers

Forks

Releases

Packages

Contributors

Languages

`/` — Landing Page

`/marketplace` — Browse & Buy

`/sell` — List Your Data

`/agent` — AI Research Agent

`/dashboard` — Earnings & History