[P1] Deploy Global Edge Infrastructure for Low-Latency API Access

[BlocksScanIO]

Feature Request: Global Edge Infrastructure

Background

Competitor Analysis Reference: Chainstack Global Nodes, QuickNode Multi-Cloud

Chainstack and QuickNode provide globally distributed, geo-load-balanced infrastructure. XDC Gateway needs edge nodes to serve global users with low latency.

Requirements

Geographic Distribution

Target regions for edge deployment:

Region	Location	Priority
Asia-Pacific	Singapore	P0
Asia-Pacific	Tokyo	P0
Asia-Pacific	Mumbai	P1
Europe	Frankfurt	P0
Europe	London	P1
North America	Virginia	P0
North America	California	P1
Middle East	Dubai	P2
South America	São Paulo	P2

Architecture

                        ┌─────────────────┐
                        │   Global DNS    │
                        │  (Geo-Routing)  │
                        └────────┬────────┘
                                 │
            ┌────────────────────┼────────────────────┐
            │                    │                    │
            ▼                    ▼                    ▼
    ┌───────────────┐    ┌───────────────┐    ┌───────────────┐
    │  Edge Node    │    │  Edge Node    │    │  Edge Node    │
    │  Singapore    │    │  Frankfurt    │    │  Virginia     │
    │               │    │               │    │               │
    │ ┌───────────┐ │    │ ┌───────────┐ │    │ ┌───────────┐ │
    │ │ API GW    │ │    │ │ API GW    │ │    │ │ API GW    │ │
    │ │ Cache     │ │    │ │ Cache     │ │    │ │ Cache     │ │
    │ │ WebSocket │ │    │ │ WebSocket │ │    │ │ WebSocket │ │
    │ └───────────┘ │    │ └───────────┘ │    │ └───────────┘ │
    └───────┬───────┘    └───────┬───────┘    └───────┬───────┘
            │                    │                    │
            └────────────────────┼────────────────────┘
                                 │
                    ┌────────────┴────────────┐
                    │     Core Cluster        │
                    │  (XDC Nodes + Indexers) │
                    └─────────────────────────┘

Components

1. Edge API Gateway

# Kong/AWS API Gateway configuration
services:
  - name: xdc-rpc
    url: http://core-cluster:8545
    routes:
      - name: rpc-route
        paths: ["/rpc"]
    plugins:
      - name: rate-limiting
        config:
          minute: 1000
      - name: caching
        config:
          ttl: 60

2. Redis Edge Cache

type EdgeCache struct {
    client *redis.Client
    ttl    time.Duration
}

func (c *EdgeCache) GetBlock(number uint64) (*Block, error) {
    key := fmt.Sprintf("block:%d", number)
    // Try edge cache first
    // Fall back to origin if miss
}

3. Geo-DNS Configuration

; Route users to nearest edge
$ORIGIN gateway.xdc.network.

; Asia-Pacific
ap.gateway.xdc.network.  IN CNAME  singapore.edge.xdc.network.
sg.gateway.xdc.network.  IN CNAME  singapore.edge.xdc.network.
jp.gateway.xdc.network.  IN CNAME  tokyo.edge.xdc.network.

; Europe
eu.gateway.xdc.network.  IN CNAME  frankfurt.edge.xdc.network.

; Americas
us.gateway.xdc.network.  IN CNAME  virginia.edge.xdc.network.
na.gateway.xdc.network.  IN CNAME  virginia.edge.xdc.network.

Performance Targets

Metric	Target	Current (Est.)
API Latency (p50)	<50ms	<200ms
API Latency (p99)	<100ms	<500ms
WebSocket Latency	<30ms	N/A
Cache Hit Rate	>80%	N/A
Uptime	99.99%	99.9%

Implementation Phases

Phase 1: Core Edge (Weeks 1-4)

• Deploy Singapore and Frankfurt edge nodes
• Configure Geo-DNS routing
• Implement Redis caching layer
• Load balancer setup

Phase 2: US Expansion (Weeks 5-6)

• Deploy Virginia edge node
• Add US-West (California)
• Cross-region replication

Phase 3: Optimization (Weeks 7-8)

• Cache warming strategies
• Smart routing algorithms
• DDoS protection
• WAF implementation

Monitoring & Observability

# Prometheus metrics
metrics:
  - edge_request_duration_seconds
  - edge_cache_hit_ratio
  - edge_active_connections
  - edge_bandwidth_bytes
  - origin_latency_seconds

Security

• DDoS protection (Cloudflare/AWS Shield)
• Rate limiting per IP/API key
• WAF rules for common attacks
• TLS 1.3 enforcement
• Origin shielding

Cost Estimation

Component	Monthly Cost
Edge Nodes (3 regions)	$1,500
Bandwidth	$500
DNS/Load Balancer	$200
DDoS Protection	$300
Total	~$2,500/month

Acceptance Criteria

• Edge nodes in 3+ regions
• Geo-DNS routing active
• <100ms p99 latency from all regions
• 99.99% uptime SLA
• Cache hit rate >80%
• DDoS protection active

Competitor Comparison

Feature	Chainstack	QuickNode	XDC Gateway (Target)
Global Nodes	✅	✅	🔄 Planned
Geo-Routing	✅	✅	✅
Edge Caching	✅	✅	✅
DDoS Protection	✅	✅	✅
Regions	10+	15+	5+

References

• Chainstack Global Nodes
• QuickNode Infrastructure
• Cloudflare Argo Smart Routing

Priority: P1 - Critical for global user experience
Estimated Effort: 8 weeks
Labels: enhancement, infrastructure, P1, edge