Your Transactions. Private.
Keldra provides secure relay delivery with encrypted transport, reliability controls, and multi-RPC execution paths for production API workloads.
How It Works
Transaction Flow Tree
One request enters, is processed across branching relay paths, then merges into a confirmed on-chain result.
STEP 1
Submit
Accept request into relay pipeline.
STEP 2
Encrypt
Protect client-to-gateway payload.
STEP 3
Batch
Group relays into short epochs.
STEP 4
Shuffle
Randomize batch ordering.
STEP 5
Inject
Distribute across RPC paths.
STEP 6
Confirm
Return relay status updates.
Submit
Your signed transaction is submitted over HTTPS and accepted into the Keldra relay pipeline.
Noise-NK Encrypted
Noise-NK payload encryption is applied client-to-gateway so transport metadata is harder to correlate.
Batched
Transactions are grouped into short epochs to reduce one-to-one timing correlation.
Shuffled
A Fisher-Yates shuffle randomizes batch order before egress so submission order is harder to map.
Injected
Multi-RPC injection distributes broadcast across available RPC paths to avoid single-path visibility.
Confirmed
Keldra tracks chain status and returns confirmation updates for each relay.
Privacy Guarantees
Keldra
Headers
Ingress
Padding
Noise
Rotation
Providers
Noise-NK
Payload
Delay
Jitter
No resale
Incentives
Pricing
Pure per-relay pricing. No subscriptions, no base fees, no recurring charges. 1 relay = 1 accepted POST /v1/relay.
0-100K
$0.005 / relay
100K-1M
$0.003 / relay
1M-10M
$0.002 / relay
10M+
$0.001 / relay
Dev
Testing, hackathons, and indie teams
$0
First 1,000 relays/month free
Throughput Limits
- 30 req/min
- 20 max inflight
- 1,000 monthly quota
Includes
- Min poll interval: 1,500ms
- Max body size: 8KB
- All 5 EVM chains
- TypeScript + Rust SDK
- Community support and docs
Pro
Wallet backends and trading bots
$0.005-$0.001 / relay
Pure usage billing with progressive brackets
Throughput Limits
- 120 req/min
- 200 max inflight
- 2,000,000 monthly quota
Includes
- Min poll interval: 500ms
- Max body size: 16KB
- IP stripping + Noise-NK transport
- Cover traffic + shuffle pathing
- Email support
- Monthly invoice from relay usage
Business
Protocols, DEXs, and bridges
$0.005-$0.001 / relay
Same pricing schedule, higher throughput tier
Throughput Limits
- 600 req/min
- 2,000 max inflight
- 20,000,000 monthly quota
Includes
- Min poll interval: 200ms
- Max body size: 32KB
- Multi-region injection
- Advanced traffic shaping
- Priority support
- Detailed usage exports
Enterprise
Market makers and high-throughput infra
$0.005-$0.001 / relay
Highest concurrency and dedicated onboarding
Throughput Limits
- 10,000 req/min
- 100,000 max inflight
- Unlimited monthly quota
Includes
- Min poll interval: 50ms
- Max body size: 64KB
- Dedicated support channel
- Custom invoicing + Net-30
- SLA and escalation paths
- Admin key governance controls
Estimate your monthly cost
Pick a volume and instantly see blended pricing across progressive brackets.
Calculate Your Cost
Drag the slider or type your expected monthly relay volume.
Expected Volume
Unit
Monthly Cost
$1,700.00
billed at end of month
Effective Rate
$0.0034 / relay
blended across brackets
vs Typical Relays
82.4x cheaper
Benchmark assumes $0.28/tx average
Bracket breakdown
Competitor Comparison
| Feature | Keldra | Flashbots | Legacy Relays | MEV Blocker |
|---|---|---|---|---|
| E2E Encryption | ✅ | ❌ | ❌ | ❌ |
| Header Privacy Controls | ✅ | ❌ | ❌ | ❌ |
| Traffic Smoothing | ✅ | ❌ | ❌ | ❌ |
| No Order Flow Sale | ✅ | ❌ | ✅ | ❌ |
| Open Source | ✅ | ✅ | ❌ | ❌ |
| Price / tx | $0.001 | Free* | $0.28 | Free* |
*Free = your order flow is the product