Non-custodial, deterministic routing engine for XRPL decentralized exchange.

Lucendex is neutral infrastructure that wallets, fintechs, and funds integrate to access deep XRPL liquidity without building DEX infrastructure themselves.

• Deterministic Execution: QuoteHash binds all parameters (tamper-evident via blake2b-256)
• Non-Custodial: Never holds user funds - users sign transactions client-side
• Circuit Breakers: Automatic price anomaly protection
• Real-Time Indexing: AMM pools + orderbook state synchronized with XRPL ledger
• Ed25519 Authentication: Secure API access with request signing
• Zero-Trust Architecture: mTLS, least-privilege DB roles, audit logging

┌─────────────┐
│   Partner   │
│ (Wallet/App)│
└──────┬──────┘
       │ HTTPS + Ed25519 signature
       ▼
┌─────────────────────────────────┐
│      API Server (Go)            │
│  • Ed25519 auth                 │
│  • Rate limiting                │
│  • Quote generation             │
└────────┬────────────────────────┘
         │
         ▼
   ┌────────────┐     ┌──────────┐
   │   Router   │────▶│ KV Store │
   │ Pathfinder │     └──────────┘
   └────────────┘
         │
         ▼
   ┌─────────────────────────────┐
   │      PostgreSQL             │
   │  • AMM pools                │
   │  • Orderbook state          │
   │  • Quote registry           │
   └─────────────────────────────┘

• PostgreSQL 15+
• rippled full-history node
• Go 1.25+

# Create database
createdb lucendex

# Run migrations
cd backend/db
psql -d lucendex -f schema.sql
for f in migrations/*.sql; do
    psql -d lucendex -f "$f"
done

make build
# Or manually:
cd backend
go build -o bin/indexer ./cmd/indexer
go build -o bin/api ./cmd/api
go build -o bin/router ./cmd/router

export DB_HOST=localhost
export DB_PORT=5432
export DB_NAME=lucendex
export RIPPLED_WS=wss://xrplcluster.com

# Start indexer (syncs XRPL data)
./backend/bin/indexer &

# Start API server
./backend/bin/api &

# API now running on http://localhost:8080

-- Insert partner
INSERT INTO partners (id, name, plan, router_bps, status)
VALUES (
    gen_random_uuid(),
    'My Wallet',
    'pro',
    20,
    'active'
);

-- Generate Ed25519 keypair externally, then:
INSERT INTO api_keys (id, partner_id, public_key, label)
VALUES (
    gen_random_uuid(),
    '<partner-id>',
    '<ed25519-public-key-hex>',
    'Production Key'
);

# Run all tests
make test

# With coverage
make test-coverage

# Security tests only
make test-security

# Specific package
cd backend && go test ./internal/router/... -v

Test Coverage:

• Core Router Engine: 89.6% (pathfinder, quote hash, validator, circuit breaker)
• KV Store: 92.5% (memory management, security, TTL, namespace isolation)
• Parser: 87.2% (AMM pools, orderbook parsing)
• XRPL Client: 55.5%
• Indexer: 22.3%

What's NOT Tested:

• cmd/* programs (thin wrappers around core engine)
• Database layer (integration tests require PostgreSQL)

Security-Critical Components: 85-92% Coverage

Test Status:

• All unit tests: ✅ passing
• Race detector: ✅ passing
• Ed25519 auth: ✅ tested
• QuoteHash determinism: ✅ tested
• Circuit breakers: ✅ tested

POST /partner/v1/quote

{
  "in": "XRP",
  "out": "USD.rIssuer",
  "amount": "100"
}

GET /partner/v1/pairs Lists available trading pairs

GET /partner/v1/usage?month=2025-11 Monthly usage metrics

GET /partner/v1/health System health check

Every request requires Ed25519 signature:

X-Partner-Id: <uuid>
X-Request-Id: <uuid>
X-Timestamp: <RFC3339>
X-Signature: base64(Ed25519.Sign(canonical_request))

Canonical request format:

METHOD + "\n" + PATH + "\n" + QUERY + "\n" + SHA256(BODY) + "\n" + TIMESTAMP

• Zero custody: Never holds user funds
• Ed25519 signing: Asymmetric key authentication
• Replay protection: Request-ID uniqueness tracking
• Rate limiting: Per-partner quotas (100/1000/10000 req/min)
• Circuit breakers: Price anomaly detection
• Audit logging: All operations logged to PostgreSQL

Don't want to self-host? Use our managed infrastructure:

• 99.9% SLA with multi-region deployment
• Enterprise support with dedicated account team
• Managed partner onboarding (we handle key generation)
• Compliance assistance for regulated entities
• Volume pricing for high-throughput integrators

Contact: hello@lucendex.com

See CONTRIBUTING.md for guidelines.

We welcome:

• Bug reports and fixes
• Performance improvements
• Additional test coverage
• Documentation improvements
• Integration examples

MIT License - See LICENSE file for details.

Note: The core Lucendex engine is open source. Partner onboarding and account management for the commercial hosted service is managed separately.

• Website: https://lucendex.com
• Documentation: https://lucendex.com/docs
• XRPL: https://xrpl.org