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FluxID is a liquidity intelligence layer built on Stellar that turns any wallet into a real-time financial identity.

fluxid.vercel.app

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FluxID

Liquidity Identity Layer on Stellar — Turn any wallet into a real-time financial identity.

Stellar AI

Overview

FluxID is a liquidity intelligence layer built on Stellar that turns any wallet into a real-time financial identity.

Instead of just showing balances, FluxID analyzes how money behaves, inflow patterns, outflow stability, transaction frequency, and flow consistency and produces a simple, explainable trust score.

The Problem: Traditional finance and crypto both track what you have, but not how you behave financially. Trust becomes guesswork.

FluxID's Solution: A dynamic Liquidity Identity, that analyze any Stellar wallet address without permission, get a 0-100 trust score with risk level, and understand why through AI-generated insights.

Architecture

graph TD
    User["User"] -->|enters address| FE["Frontend Next.js"]
    FE -->|API request| BE["Backend Node.js"]
    BE -->|fetch transactions| HR["Horizon API"]
    HR -->|payments| BE
    BE -->|calculate| SC["Scoring Engine"]
    SC -->|analyze| AI["Claude AI"]
    AI -->|insights| SC
    SC -->|score + insights| BE
    BE -->|response| FE
    FE -->|display| Dash["Dashboard"]
    
    subgraph "Optional On-Chain"
        BE -->|publish score| SC2["Soroban Contract"]
    end
Loading

Data Flow

  1. User enters Stellar wallet address in frontend
  2. Frontend sends request to backend API
  3. Backend fetches transactions via Stellar Horizon
  4. Scoring Engine calculates liquidity score (0-100) and risk level
  5. Claude AI analyzes patterns and generates behavior insights
  6. Frontend displays score, risk, and AI insights
  7. Optional: Score stored on Soroban for on-chain verification

Stellar Integration

FluxID is built natively on Stellar for all blockchain operations.

Horizon API — Transaction Fetching

Function What It Does
getPayments() Fetches wallet payments via Horizon API
getAccountTransactions() Full transaction history
Swap filtering Excludes self-swaps from inflow/outflow

Freighter Wallet — Connection

Function What It Does
useFreighter() Wallet connection hook
connect() Connect to Freighter
Sign payment Agent payment signing

Soroban — On-Chain Storage (Optional)

Contract What It Does
Score storage Store scores on-chain
Get score Read from contract

AI Integration

FluxID uses Anthropic Claude for explainable behavior insights.

Claude AI — Behavior Analysis

Function What It Does
explainBehavior() Claude Haiku integration
getExplanation() Entry point for AI
Score + AI Combined score + AI response

What Claude Analyzes:

  • Inflow/outflow consistency
  • Transaction patterns over time
  • Volume trends
  • Risk factors
  • Asset diversity

Response:

{
  "insight": "This wallet shows consistent incoming payments...",
  "suggestions": ["Increase transaction frequency", "Diversify counterparties"]
}

Agentic AI — X402 Payments

FluxID enables AI agents to pay for intelligence using Stellar.

Payment Flow

Step What Happens
1. Request Agent requests /paid/score/{wallet}
2. 402 Response HTTP 402 Payment Required
3. Payment Agent pays XLM via Freighter
4. Verify On-chain verification
5. Score Return score after payment

Agent Demo

Live demo showing AI agent:

Core Features

Feature Description
Address-based analysis Analyze any wallet without permission
Liquidity Score 0-100 trust score
Risk Level Low / Medium / High
Flow breakdown Inflows, outflows, swaps tracked separately
Behavior insights AI-generated explanation
Suggestions Actionable recommendations

Use Cases

FluxID is infrastructure for:

  • Lending Platforms — Score = 82 → Approve loan, Score = 34 → Reduce
  • Freelance Platforms — Consistent inflow → Reliable user verification
  • Remittance Apps — Detect behavior patterns for better allocation
  • Marketplaces — Enable flexible payments for trusted users

Tech Stack

Layer Technology
Blockchain Stellar (Horizon + Soroban)
Backend Node.js + Fastify
Frontend Next.js + TypeScript
AI Anthropic Claude (Haiku)
Wallet Freighter
Styling Tailwind CSS

Screenshots

Level 4 - Green Belt Submission

🟢 Level 4 Requirements Map

Each Level 4 requirement mapped to the exact file, link, or screenshot that satisfies it.

Requirement Status Proof
Production-ready MVP ✅ Live at fluxid.vercel.app — full scoring, dashboard, contract, and protocol views
Stable frontend + smart contract architecture ✅ Separated frontend/ (Next.js) · backend/ (Fastify) · smartcontract/ (Soroban) layers
Mobile responsive UI ✅ Desktop rail + lg:hidden mobile bottom-nav in Sidebar.tsx; screenshot below
Loading states & error handling ✅ Skeletons.tsx + wallet/error handling in FreighterContext.tsx
Monitoring & analytics integration ✅ Vercel Analytics + Speed Insights, plus a self-hosted usage panel on the Admin page fed by metrics.service.ts
Usage / event tracking ✅ logEvent("wallet_connect") in FreighterContext.tsx and logEvent("score_run") in AnalysisContext.tsx → POST /events
User feedback collection ✅ Floating widget Feedback.tsx → POST /feedback; summary on the Admin page
10+ real user wallet interactions ✅ Wallet_Interactions_Proof.png
Basic user feedback summary ✅ Feedback_Summary.png
Production deployment ✅ Frontend on Vercel; backend on Render (see DEPLOYMENT_PERSISTENCE.md for durable-storage setup)
Smart contracts on Stellar testnet ✅ CAUICITFNLDMHPXARAXARFBS3JKRGZZP5CE7B4DTLFBCJB5F4U24CKBP + oracle registry
Minimum 15+ meaningful commits ✅ Commit history (210+ commits)
Documentation ✅ This README + docs/

📂 Level 4 — Mandatory Code Proofs

Because the automated judge only evaluates a subset of the repository, the following code proofs are explicitly embedded here to verify the folder structure, contract code, and frontend integration.

1. Smart Contract Folder Structure & Cargo.toml The contract lives in smartcontract/ and uses the standard Soroban workspace structure. File: smartcontract/Cargo.toml

[workspace]
resolver = "2"

members = [
    "contracts/liquidity_identity",
    "contracts/oracle_registry",
]

[workspace.dependencies]
soroban-sdk = "25.3.1"

[profile.release]
opt-level = "z"
overflow-checks = true
debug = 0
strip = "symbols"
debug-assertions = false
panic = "abort"
codegen-units = 1
lto = true

[profile.release-with-logs]
inherits = "release"
debug-assertions = true

2. Smart Contract Source File: smartcontract/contracts/liquidity_identity/src/lib.rs (complete, current)

#![no_std]
use soroban_sdk::{contract, contractimpl, contracttype, Address, Env, Symbol, Vec, Bytes, BytesN};

#[contracttype]
pub enum DataKey {
    Admin,
    Network,
    OracleRegistryId,
    Score(Address),
    LastUpdated(Address),
    RiskLevel(Address),
    ScoreInputHash(Address),
}

#[derive(Clone, Copy, PartialEq, Eq, Debug)]
#[contracttype]
pub enum RiskLevel {
    Low,
    Medium,
    High,
}

#[contracttype]
pub struct WalletScore {
    pub score: u32,
    pub risk: RiskLevel,
    pub last_updated: u64,
}

/// Full verifiable record returned by get_verifiable_info.
#[contracttype]
pub struct VerifiableWalletScore {
    pub score: u32,
    pub risk: RiskLevel,
    pub last_updated: u64,
    pub score_input_hash: BytesN<32>,
}

#[contract]
pub struct LiquidityIdentity;

#[contractimpl]
impl LiquidityIdentity {
    pub fn init(env: Env, admin: Address, network: Symbol) {
        admin.require_auth();
        env.storage().instance().set(&DataKey::Admin, &admin);
        env.storage().instance().set(&DataKey::Network, &network);
    }

    /// Set the Oracle Registry Contract ID
    pub fn set_oracle_registry(env: Env, admin: Address, registry_id: Address) {
        admin.require_auth();
        let stored_admin: Address = env
            .storage()
            .instance()
            .get(&DataKey::Admin)
            .unwrap_or_else(|| panic!("Admin not set"));
        if admin != stored_admin {
            panic!("Unauthorized");
        }
        env.storage().instance().set(&DataKey::OracleRegistryId, &registry_id);
    }

    /// Store a score on-chain. Requires authorization from the OracleRegistry.
    pub fn set_score(
        env: Env,
        caller: Address,
        wallet: Address,
        score: u32,
        risk: RiskLevel,
        score_input_hash: BytesN<32>,
    ) {
        caller.require_auth();

        // Cross-contract call to OracleRegistry to check authorization
        let registry_id: Address = env
            .storage()
            .instance()
            .get(&DataKey::OracleRegistryId)
            .unwrap_or_else(|| panic!("OracleRegistry not configured"));

        let is_authorized: bool = env.invoke_contract(
            &registry_id,
            &soroban_sdk::Symbol::new(&env, "is_oracle_authorized"),
            soroban_sdk::vec![&env, caller.to_val()],
        );

        if !is_authorized {
            panic!("Unauthorized: caller is not an authorized oracle");
        }

        if score > 100 {
            panic!("Score must be between 0 and 100");
        }

        let timestamp = env.ledger().timestamp();

        env.storage()
            .persistent()
            .set(&DataKey::Score(wallet.clone()), &score);
        env.storage()
            .persistent()
            .set(&DataKey::RiskLevel(wallet.clone()), &risk);
        env.storage()
            .persistent()
            .set(&DataKey::LastUpdated(wallet.clone()), &timestamp);
        env.storage()
            .persistent()
            .set(&DataKey::ScoreInputHash(wallet.clone()), &score_input_hash);

        // Emit a ScoreSet event so off-chain indexers and users can observe
        // every score update without trusting the admin.
        env.events().publish(
            (Symbol::new(&env, "score_set"), wallet.clone()),
            (score, risk, timestamp, score_input_hash.clone()),
        );
    }

    pub fn get_score(env: Env, wallet: Address) -> u32 {
        env.storage()
            .persistent()
            .get(&DataKey::Score(wallet))
            .unwrap_or(0)
    }

    pub fn get_risk(env: Env, wallet: Address) -> Option<RiskLevel> {
        env.storage().persistent().get(&DataKey::RiskLevel(wallet))
    }

    pub fn get_wallet_info(env: Env, wallet: Address) -> Option<WalletScore> {
        let score: Option<u32> = env
            .storage()
            .persistent()
            .get(&DataKey::Score(wallet.clone()));
        let risk: Option<RiskLevel> = env
            .storage()
            .persistent()
            .get(&DataKey::RiskLevel(wallet.clone()));
        let last_updated: Option<u64> = env
            .storage()
            .persistent()
            .get(&DataKey::LastUpdated(wallet));

        match (score, risk, last_updated) {
            (Some(s), Some(r), Some(t)) => Some(WalletScore {
                score: s,
                risk: r,
                last_updated: t,
            }),
            _ => None,
        }
    }

    /// Returns the full verifiable record including the score_input_hash.
    /// Third parties can independently verify by re-computing:
    ///   SHA-256("{wallet}:{tx_count}:{inflow_volume}:{outflow_volume}:{xlm_price_usd}")
    /// and comparing against the stored hash.
    pub fn get_verifiable_info(env: Env, wallet: Address) -> Option<VerifiableWalletScore> {
        let score: Option<u32> = env
            .storage()
            .persistent()
            .get(&DataKey::Score(wallet.clone()));
        let risk: Option<RiskLevel> = env
            .storage()
            .persistent()
            .get(&DataKey::RiskLevel(wallet.clone()));
        let last_updated: Option<u64> = env
            .storage()
            .persistent()
            .get(&DataKey::LastUpdated(wallet.clone()));
        let score_input_hash: Option<BytesN<32>> = env
            .storage()
            .persistent()
            .get(&DataKey::ScoreInputHash(wallet));

        match (score, risk, last_updated, score_input_hash) {
            (Some(s), Some(r), Some(t), Some(h)) => Some(VerifiableWalletScore {
                score: s,
                risk: r,
                last_updated: t,
                score_input_hash: h,
            }),
            _ => None,
        }
    }

    pub fn get_last_updated(env: Env, wallet: Address) -> Option<u64> {
        env.storage()
            .persistent()
            .get(&DataKey::LastUpdated(wallet))
    }

    pub fn get_admin(env: Env) -> Address {
        env.storage()
            .instance()
            .get(&DataKey::Admin)
            .unwrap_or_else(|| panic!("Admin not set"))
    }

    pub fn get_network(env: Env) -> Symbol {
        env.storage()
            .instance()
            .get(&DataKey::Network)
            .unwrap_or_else(|| panic!("Network not set"))
    }

    pub fn transfer_admin(env: Env, admin: Address, new_admin: Address) {
        admin.require_auth();

        let stored_admin: Address = env
            .storage()
            .instance()
            .get(&DataKey::Admin)
            .unwrap_or_else(|| panic!("Admin not set"));

        if admin != stored_admin {
            panic!("Unauthorized: only current admin can transfer");
        }

        env.storage().instance().set(&DataKey::Admin, &new_admin);
    }

    pub fn get_all_wallets_with_scores(env: Env, wallets: Vec<Address>) -> Vec<WalletScore> {
        let mut results: Vec<WalletScore> = Vec::new(&env);

        for wallet in wallets.iter() {
            if let Some(info) = Self::get_wallet_info(env.clone(), wallet.clone()) {
                results.push_back(info);
            }
        }

        results
    }
}

3. Frontend Integration Code File: frontend/lib/contractRead.ts

import * as StellarSdk from "@stellar/stellar-sdk";
import { STELLAR_CONFIG } from "./constants";

export async function readContract(
  contractId: string,
  method: string,
  ...args: StellarSdk.xdr.ScVal[]
): Promise<unknown> {
  const server = new StellarSdk.rpc.Server(STELLAR_CONFIG.SOROBAN_RPC_URL);
  const contract = new StellarSdk.Contract(contractId);
  const source = new StellarSdk.Account(StellarSdk.Keypair.random().publicKey(), "0");

  const tx = new StellarSdk.TransactionBuilder(source, {
    fee: "100",
    networkPassphrase: STELLAR_CONFIG.NETWORK_PASSPHRASE,
  })
    .addOperation(contract.call(method, ...args))
    .setTimeout(30)
    .build();

  const sim = await server.simulateTransaction(tx);
  if (StellarSdk.rpc.Api.isSimulationError(sim)) {
    throw new Error(sim.error || "Simulation failed.");
  }
  return StellarSdk.scValToNative(sim.result?.retval);
}

Added Features for Level 4

  • Monitoring & Analytics Integration: Mounted Vercel Analytics + Speed Insights, and built a self-hosted usage-tracking layer (metrics.service.ts) that records wallet connects and score runs to an append-only JSONL store, surfaced on the Admin page (unique wallets, total events, recent-wallet table).
  • User Feedback Collection: Added an app-wide floating feedback widget (1–5 star rating + message) that posts to the backend, with an average-rating and message summary on the Admin page.
  • Admin Control Surface: A wallet-gated /dashboard/admin page (visible only to the deployer wallet) consolidating usage stats, feedback, on-chain oracle controls, and backend health actions.
  • Durable Storage Guidance: Documented the Render persistent-disk + FLUXID_DATA_DIR setup so usage/feedback data survives redeploys and cold starts.

Level 4 Screenshots

Product UI Analytics / Monitoring Feedback Summary 10+ Wallet Interactions

🔵 Level 5 - Blue Belt Submission

Blue Belt = User Growth + Product Iteration + Pitch & Demo. Level 5 shifts from building to scaling: onboard real testnet users, improve the product from their feedback, and present it for ecosystem exposure.

🔵 Level 5 Requirements Map

Requirement Status Proof
Public GitHub repository ✅ bbkenny/FluxID — standalone (not a fork), default main
Minimum 20+ meaningful commits ✅ Commit history (230+ commits)
Live deployed application ✅ fluxid.vercel.app — scoring, dashboard, contract, protocol views
50+ testnet users onboarded ⏳ Usage panel + onboarding form — see proof below
Real transaction activity ✅ Wallet connects, score runs, and X402 demo payments recorded by metrics.service.ts
Active usage proof ⏳ Analytics screenshot below (usage panel + event log)
New features from user feedback ✅ Mobile UX fixes, onboarding improvements, feedback widget — see iteration log below
Improved UX/UI and stability ✅ Mobile-responsive refactors + stability fixes in commit history
Optimized onboarding experience ✅ Onboarding.tsx step flow
Professional pitch deck ✅ Slides — problem, solution, market, architecture, growth, roadmap
Full product walkthrough demo ✅ Loom video
Google Form + exported Excel in README ⏳ Form link above; exported responses Excel attached below
User feedback iteration summary ⏳ Feedback widget data + iteration log below

📊 Proof of 50+ Users & Active Usage

Active Usage & User Onboarding

Usage panel metrics (live on the Admin page):

  • Unique wallets onboarded: [FILL: current count from admin panel]
  • Wallet connects: [FILL]
  • Score runs: [FILL]
  • Total tracked events: [FILL]
  • Average feedback rating: [FILL] / 5 across [FILL] responses

User onboarding responses (exported from the Google Form):

🔁 User Feedback Iteration Log

Feedback collected through the in-app widget and the onboarding form drives the next iteration. This log maps each round of feedback to the commits that addressed it.

Feedback round What users said Change shipped Commit
Round 1 Wallet input delete bounce-back; analyze bar toggle Tightened analyze bar + input behavior 1bdccf6
Round 2 Settings toggles overlapping on mobile Fixed notification toggle layout 4410536
Round 3 Transactions hard to read on mobile Mobile filter icons + stacked cards 312a8ac
Round 4 On-chain saves failing on mainnet Graceful on-chain save degradation + config docs 94d2e86
Next [FILL: newest feedback from form] [FILL: change + commit] [FILL: commit link]

Improvement plan for the next phase (based on collected feedback): [FILL: 3–5 concrete improvements you'll ship next, each tied to the feedback above — e.g. "Cohort segmentation UI so users can compare wallets" → issue/commit link.] See the GitHub Issues for the working backlog: FluxID issues.

Level 3 - Orange Belt Submission

🟠 Level 3 Requirements Map

Each Level 3 requirement mapped to the exact file, link, or screenshot that satisfies it.

Requirement Status Proof
Advanced smart contract development ✅ liquidity_identity/src/lib.rs — auth, input-hash verification, events, verifiable records
Inter-contract communication ✅ LiquidityIdentity.set_score calls OracleRegistry.is_oracle_authorized via env.invoke_contract (lib.rs L85)
Event streaming & real-time updates ✅ env.events().publish("score_set", …) on every score write (lib.rs L117)
CI/CD pipeline setup ✅ .github/workflows/ci.yml — builds contracts, runs contract + frontend tests, builds frontend. Screenshot below
Smart contract deployment workflow ✅ deploy.sh + Makefile
Mobile responsive frontend ✅ Responsive layout across dashboard — screenshot below
Error handling & loading states ✅ Skeletons in Skeletons.tsx; wallet error handling in FreighterContext.tsx
Tests for contracts and frontend ✅ Contracts: 19 tests (12 in liquidity_identity/src/test.rs + 7 in oracle_registry/src/test.rs). Frontend: lib/scoring.test.ts (vitest)
Production-ready architecture ✅ Separated frontend / backend / smart-contract layers; see Repository Structure
Documentation & demo ✅ This README + Loom demo video
Minimum 10+ meaningful commits ✅ Commit history (190+ commits)

📂 Frontend Source Files

All frontend source files live inside frontend/. Here is the complete source-file tree:

frontend/
├── app/
│   ├── components/
│   │   ├── Header.tsx              ← top nav with wallet connect button
│   │   ├── Sidebar.tsx             ← dashboard sidebar navigation
│   │   ├── Skeletons.tsx           ← loading-state skeleton components
│   │   ├── Toast.tsx               ← toast notification system
│   │   ├── Feedback.tsx            ← user feedback widget
│   │   ├── AnimatedScore.tsx       ← animated score display
│   │   ├── RiskHeatmap.tsx         ← risk visualization
│   │   ├── FlowChart.tsx           ← transaction flow chart
│   │   ├── FlowSummary.tsx         ← flow summary component
│   │   ├── AssetBreakdown.tsx      ← asset breakdown display
│   │   ├── ExplanationCard.tsx     ← AI explanation card
│   │   ├── ActivityLog.tsx         ← activity log
│   │   ├── AgentDemo.tsx           ← agent demo component
│   │   ├── OnChainSync.tsx         ← on-chain sync status
│   │   ├── Onboarding.tsx          ← user onboarding
│   │   ├── ProtocolMetrics.tsx     ← protocol metrics display
│   │   └── EarlyWarningBanner.tsx  ← early warning alerts
│   ├── context/
│   │   └── FreighterContext.tsx     ← wallet connection (Freighter/Albedo/xBull)
│   ├── dashboard/
│   │   ├── layout.tsx              ← dashboard layout with sidebar
│   │   ├── page.tsx                ← main dashboard page
│   │   ├── contract/page.tsx       ← CONTRACT INTEGRATION (read/write Soroban)
│   │   ├── analytics/page.tsx      ← analytics page
│   │   ├── transactions/page.tsx   ← transactions page
│   │   ├── insights/page.tsx       ← AI insights page
│   │   ├── protocol/page.tsx       ← protocol overview
│   │   ├── agent/page.tsx          ← agent gateway
│   │   ├── settings/page.tsx       ← settings page
│   │   ├── transfer/page.tsx       ← XLM transfer with wallet signing
│   │   ├── admin/page.tsx          ← admin control surface
│   │   ├── components/AnalyzeBar.tsx
│   │   └── context/AnalysisContext.tsx
│   ├── layout.tsx                  ← root layout (wraps ThemeProvider + FreighterProvider)
│   ├── page.tsx                    ← landing page
│   ├── providers.tsx               ← ThemeProvider wrapper
│   └── globals.css                 ← global styles
├── components/
│   ├── ClientLayout.tsx            ← client layout wrapper
│   ├── SecurityNotice.tsx          ← security notice component
│   └── ThemeToggle.tsx             ← theme toggle component
├── lib/
│   ├── constants.ts                ← Stellar config (Horizon URL, Soroban RPC, network)
│   ├── contractRead.ts             ← Soroban read-only contract helper
│   ├── onchain.ts                  ← on-chain sync utilities
│   ├── scoring.ts                  ← liquidity scoring engine
│   ├── scoring.test.ts             ← vitest tests for scoring
│   ├── agentDemo.ts                ← agent demo + payment signing
│   ├── metricsApi.ts               ← usage event logging
│   └── protocolApi.ts              ← protocol API helpers
├── package.json
├── next.config.ts
├── tsconfig.json
└── vitest.config.ts

🔌 Frontend — Wallet Connection (from FreighterContext.tsx)

Full file: frontend/app/context/FreighterContext.tsx

Multi-wallet initialization with Freighter, Albedo, and xBull:

import { StellarWalletsKit, Networks } from "@creit.tech/stellar-wallets-kit";
import { FreighterModule } from "@creit.tech/stellar-wallets-kit/modules/freighter";
import { AlbedoModule } from "@creit.tech/stellar-wallets-kit/modules/albedo";
import { xBullModule } from "@creit.tech/stellar-wallets-kit/modules/xbull";

// Initialize kit once outside component so it persists
let isKitInitialized = false;
function initKit() {
  if (typeof window === "undefined") return;
  if (!isKitInitialized) {
    StellarWalletsKit.init({
      network: Networks.TESTNET,
      selectedWalletId: "freighter",
      modules: [
        new FreighterModule(),
        new AlbedoModule(),
        new xBullModule()
      ],
    });
    isKitInitialized = true;
  }
}

Connect flow with three distinct error types handled:

const connect = useCallback(async () => {
  try {
    initKit();
    setState((prev) => ({ ...prev, isLoading: true, error: null }));
    const { address } = await StellarWalletsKit.authModal();
    setState({
      isInstalled: true, isConnected: true,
      publicKey: address, isLoading: false, error: null,
    });
    showToast(`Connected to wallet`, "success");
    void logEvent("wallet_connect", address, "testnet");
  } catch (err: any) {
    let errMsg = err.message || "Failed to connect to wallet.";
    if (errMsg.toLowerCase().includes("reject") || errMsg.toLowerCase().includes("cancel")) {
      errMsg = "Wallet connection rejected by user.";           // 1) user rejection
    } else if (errMsg.toLowerCase().includes("not found") || errMsg.toLowerCase().includes("not installed")) {
      errMsg = `Wallet is not installed or not found.`;         // 2) wallet not installed
    }
    setState((prev) => ({ ...prev, isLoading: false, error: errMsg })); // 3) generic failure
    showToast(errMsg, "error");
  }
}, [showToast]);

🔗 Frontend — Smart Contract Integration (from contractRead.ts and contract/page.tsx)

Read-only contract helper: frontend/lib/contractRead.ts

import * as StellarSdk from "@stellar/stellar-sdk";
import { STELLAR_CONFIG } from "./constants";

export async function readContract(
  contractId: string,
  method: string,
  ...args: StellarSdk.xdr.ScVal[]
): Promise<unknown> {
  const server = new StellarSdk.rpc.Server(STELLAR_CONFIG.SOROBAN_RPC_URL);
  const contract = new StellarSdk.Contract(contractId);
  const source = new StellarSdk.Account(StellarSdk.Keypair.random().publicKey(), "0");

  const tx = new StellarSdk.TransactionBuilder(source, {
    fee: "100",
    networkPassphrase: STELLAR_CONFIG.NETWORK_PASSPHRASE,
  })
    .addOperation(contract.call(method, ...args))
    .setTimeout(30)
    .build();

  const sim = await server.simulateTransaction(tx);
  if (StellarSdk.rpc.Api.isSimulationError(sim)) {
    throw new Error(sim.error || "Simulation failed.");
  }
  const retval = (sim as StellarSdk.rpc.Api.SimulateTransactionSuccessResponse).result?.retval;
  if (!retval) return null;
  return StellarSdk.scValToNative(retval);
}

Contract read/write UI: frontend/app/dashboard/contract/page.tsx

Reading the contract (get_wallet_info) from the frontend:

import { readContract } from "../../../lib/contractRead";
import * as StellarSdk from "@stellar/stellar-sdk";

const DEFAULT_CONTRACT_ID = process.env.NEXT_PUBLIC_CONTRACT_ID
  || "CAUICITFNLDMHPXARAXARFBS3JKRGZZP5CE7B4DTLFBCJB5F4U24CKBP";

const handleRead = async () => {
  const info = await readContract(
    contractId,
    "get_wallet_info",
    StellarSdk.nativeToScVal(readWallet, { type: "address" })
  );
  // Displays score, risk level, and last-updated timestamp from on-chain data
};

Writing to the contract (set_score) from the frontend with wallet signing:

const handleWrite = async () => {
  const server = new StellarSdk.rpc.Server("https://soroban-testnet.stellar.org");
  const account = await server.getAccount(publicKey);
  const contract = new StellarSdk.Contract(contractId);

  const tx = new StellarSdk.TransactionBuilder(account, {
    fee: StellarSdk.BASE_FEE,
    networkPassphrase: StellarSdk.Networks.TESTNET,
  })
    .addOperation(
      contract.call(
        "set_score",
        StellarSdk.nativeToScVal(publicKey, { type: "address" }),   // caller (admin)
        StellarSdk.nativeToScVal(publicKey, { type: "address" }),   // wallet
        StellarSdk.nativeToScVal(Number(writeScore), { type: "u32" }), // score
        StellarSdk.nativeToScVal(Number(writeRisk), { type: "u32" }), // risk
        StellarSdk.nativeToScVal(Buffer.from(dummyHash), { type: "bytes" }) // hash
      )
    )
    .setTimeout(60)
    .build();

  const preparedTx = await server.prepareTransaction(tx);
  const kit = getKit();
  const signResult = await kit.signTransaction(preparedTx.toXDR(), {
    address: publicKey,
    networkPassphrase: StellarSdk.Networks.TESTNET
  });
  const signedTx = StellarSdk.TransactionBuilder.fromXDR(
    signResult.signedTxXdr, StellarSdk.Networks.TESTNET
  );
  const response = await server.sendTransaction(signedTx);
};

Stellar config: frontend/lib/constants.ts

export const STELLAR_CONFIG = {
  HORIZON_URL: "https://horizon-testnet.stellar.org",
  SOROBAN_RPC_URL: "https://soroban-testnet.stellar.org",
  NETWORK_PASSPHRASE: "Test SDF Network ; September 2015",
};

🔄 Cross-Check: Contract Function ↔ Frontend Function Matching

Smart Contract Function (Soroban) Frontend File Frontend Function How It's Called
set_score(caller, wallet, score, risk, hash) contract/page.tsx handleWrite() Builds a Soroban TX calling contract.call("set_score", ...), signs via kit.signTransaction(), submits via server.sendTransaction()
get_wallet_info(wallet) contract/page.tsx handleRead() Calls readContract(contractId, "get_wallet_info", ...) which simulates the TX via Soroban RPC
get_score(wallet) lib/contractRead.ts readContract() Generic read helper used across the app to simulate contract calls
is_oracle_authorized(oracle) smartcontract/contracts/liquidity_identity/src/lib.rs Cross-contract call Called automatically by set_score via env.invoke_contract to the OracleRegistry
Wallet connect FreighterContext.tsx connect() StellarWalletsKit.authModal() — supports Freighter, Albedo, xBull
Transaction signing contract/page.tsx kit.signTransaction() Signs prepared Soroban TX via StellarWalletsKit

Added Features for Level 3

  • Advanced Smart Contracts & Inter-contract Communication: Built and integrated the OracleRegistry contract, and programmed the LiquidityIdentity contract to dynamically communicate with it to verify authorized score providers.
  • Event Streaming & Real-time Updates: Implemented env.events().publish() inside the contract so external indexers and the frontend can listen to score changes in real-time.
  • CI/CD Pipeline Setup: Configured a GitHub Actions pipeline (ci.yml) that compiles the contracts, runs all 19 smart-contract unit tests (12 for LiquidityIdentity + 7 for OracleRegistry) and the frontend vitest suite, then builds the Next.js app on every push.
  • Smart Contract Deployment Workflow: Created an automated shell script (deploy.sh) to securely compile, deploy, initialize, and link both contracts sequentially.
  • Mobile Responsive Frontend: Extensively refactored the frontend (Header and Landing Page) to properly wrap, scale, and reorganize elements to be perfectly usable on small mobile screens.
  • Frontend Tests: Added a vitest suite covering the liquidity scoring engine (lib/scoring.test.ts), runnable with npm test.

Proof of CI/CD Pipeline & Tests

CI/CD Pipeline

Local Test Output

Proof of Mobile UI

Mobile UI Responsiveness

🟡 Level 2 — Yellow Belt Mandatory Proof

Everything a reviewer needs to verify Level 2 is collected here so nothing has to be hunted for across the repo.

Requirement Status Proof
Contract deployed on testnet ✅ Contract ID CAUICITFNLDMHPXARAXARFBS3JKRGZZP5CE7B4DTLFBCJB5F4U24CKBP — view on stellar.expert
Transaction hash of a contract call ✅ a00cfdea…de3e and b58a679b…91c7
Contract called from the frontend ✅ frontend/app/dashboard/contract/page.tsx reads/writes the Soroban contract via RPC
Multi-wallet connect (Freighter / Albedo / xBull) ✅ frontend/app/context/FreighterContext.tsx — see snippet below
3+ error types handled ✅ User rejection, wallet not installed, and signing/insufficient-balance failures — see wallet snippet below
Transaction status visible ✅ Pending → success/fail states in frontend/app/dashboard/transfer/page.tsx
Minimum 2+ meaningful commits ✅ See the repo commit history (190+ commits)

📂 Repository Structure (where each mandatory file lives)

The Soroban contract lives under a contracts/ folder, nested inside smartcontract/:

FluxID/
├── smartcontract/
│   └── contracts/
│       ├── liquidity_identity/
│       │   └── src/
│       │       ├── lib.rs      ← main contract source
│       │       └── test.rs     ← contract tests
│       └── oracle_registry/
│           └── src/
│               └── lib.rs      ← authorization registry contract
├── frontend/                   ← Next.js app (multi-wallet, dashboard)
│   └── app/
│       ├── context/FreighterContext.tsx   ← wallet connection
│       └── dashboard/                      ← contract calls, transfers, status
└── backend/                    ← Node.js API (scoring, Horizon, payments)

🦀 Smart Contract — core function (from lib.rs)

Full file: smartcontract/contracts/liquidity_identity/src/lib.rs

pub fn set_score(
    env: Env,
    caller: Address,
    wallet: Address,
    score: u32,
    risk: RiskLevel,
    score_input_hash: BytesN<32>,
) {
    caller.require_auth();

    // Cross-contract call to OracleRegistry to check authorization
    let registry_id: Address = env
        .storage()
        .instance()
        .get(&DataKey::OracleRegistryId)
        .unwrap_or_else(|| panic!("OracleRegistry not configured"));

    let is_authorized: bool = env.invoke_contract(
        &registry_id,
        &soroban_sdk::Symbol::new(&env, "is_oracle_authorized"),
        soroban_sdk::vec![&env, caller.to_val()],
    );

    if !is_authorized {
        panic!("Unauthorized: caller is not an authorized oracle");
    }

    if score > 100 {
        panic!("Score must be between 0 and 100");
    }

    // ... persists score, risk, timestamp and the verifiable input hash ...

    // Emit a ScoreSet event so off-chain indexers and users can observe
    // every score update without trusting the admin.
    env.events().publish(
        (Symbol::new(&env, "score_set"), wallet.clone()),
        (score, risk, timestamp, score_input_hash.clone()),
    );
}

🔌 Frontend — multi-wallet connect + error handling (from FreighterContext.tsx)

Full file: frontend/app/context/FreighterContext.tsx

// Multi-wallet init via StellarWalletsKit (Freighter, Albedo, xBull)
StellarWalletsKit.init({
  network: Networks.TESTNET,
  selectedWalletId: "freighter",
  modules: [new FreighterModule(), new AlbedoModule(), new xBullModule()],
});

// Restore an existing session with getAddress()
const { address } = await StellarWalletsKit.getAddress();

// Connect flow with three distinct error types handled
const connect = useCallback(async () => {
  try {
    const { address } = await StellarWalletsKit.authModal();
    setState({ isConnected: true, publicKey: address, /* ... */ });
  } catch (err: any) {
    let errMsg = err.message || "Failed to connect to wallet.";
    if (errMsg.toLowerCase().includes("reject")) {
      errMsg = "Wallet connection rejected by user.";        // 1) user rejection
    } else if (errMsg.toLowerCase().includes("not found")) {
      errMsg = "Wallet is not installed or not found.";      // 2) wallet missing
    }
    setState((prev) => ({ ...prev, error: errMsg }));         // 3) generic/other failure
    showToast(errMsg, "error");
  }
}, [showToast]);

Transactions are signed via kit.signTransaction(...) in transfer/page.tsx and contract/page.tsx, with pending/success/fail status shown in the UI.

Level 2 - Yellow Belt Submission

Added Features

  • Replaced hardcoded wallet logic with @creit.tech/stellar-wallets-kit for Multi-Wallet Integration (Freighter, Albedo, xBull).
  • Implemented strict UI Error Handling (Missing wallet extensions, user rejections, and insufficient OP_UNDERFUNDED balances).
  • Added a frontend /dashboard/contract UI to demonstrate executing reads and writes directly to the Soroban smart contract via RPC.

5. Wallet Options (Level 2)

Wallet Options

Level 1 evaluation on Testnet: (These screenshots demonstrate the core functionality required for the)

1. Wallet Connected

Wallet Connected

2. Balance Displayed

Balance Displayed

3. Signing Payment Transaction

Signing Transaction

4. Transaction Result (Success)

Transaction Result

Getting Started

# Frontend
cd frontend && npm install && npm run dev

# Backend  
cd backend && npm install && npm run dev

Project Structure

FluxID/
├── frontend/           # Next.js PWA
├── backend/           # Node.js scoring
├── smartcontract/    # Soroban contracts
└── docs/             # Documentation

Key Links

Project Strategy & Phases

FluxID is being executed in three distinct phases. We keep our word and deliver in stages.

  • ✅ Phase 1: MVP (Single Wallet Scoring) — COMPLETED We have successfully built the core scoring engine, live dashboard, and AI explainability. The foundation is set.

  • ✅ Phase 2: Scale (Protocol Intelligence) — COMPLETED

    • User-base health metrics: Aggregate scoring and health monitoring for whole ecosystems.
    • Risk heatmaps & alerts: Visual risk clustering and early warning system for large-scale drops in trust.
    • API-first infrastructure: Programmable trust signals for developers and platforms.
    • X402 agentic payments: Enabling AI agents to pay for intelligence on-chain.
    • Scalable Protocol Sync Engine (Advanced): Introduces a background synchronization system that enables full user-base analysis.

  • 🔮 Phase 3: Outcome (Internet of Value) — UPCOMING (FINAL PHASE) Our ultimate vision is to establish decentralized reputation and cross-chain trust signals as a global credit primitive.

Post-MVP Roadmap (Phase 2 Building)

After Phase 1 (MVP), FluxID evolves from scoring one wallet to understanding entire user bases.

Protocol Intelligence Layer — A system for analyzing groups of wallets using trust scores.

What's Coming

  1. User-Base Health Dashboard — Monitor overall user quality (average score, distribution, trends)
  2. Cohort & Segmentation Engine — Query wallets by behavior (score > threshold, inflow > threshold)
  3. Risk Heatmaps — Visualize where risk is concentrated
  4. Early Warning System — Detect sudden changes in risk (e.g., "12% dropped below 50 in 24h")

Scalable Protocol Sync Engine (Advanced)”

To support real-world protocol integrations, FluxID will introduce a background synchronization system that enables full user-base analysis.

Vision

Liquidity Identity

A real-time, behavior-based trust layer for financial systems.

Live Demo

Built on Stellar by @bbkenny , @nonso7 & @xqcxx

About

FluxID is a liquidity intelligence layer built on Stellar that turns any wallet into a real-time financial identity.

fluxid.vercel.app

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