Non-Custodial Architecture · Double-Entry Ledger · Multi-Chain

Next-Gen Stablecoin Payment Gateway & Clearing Engine

Production-grade financial rails for automated USDT, USDC, and EURC acceptance. Features asynchronous mempool watchers, dynamic BIP-44 deposit derivation, multi-sig treasury sweeps, cryptographic webhooks with HMAC-SHA256, and ACID-compliant double-entry ledger bookkeeping.

Gateway Latency

42 ms avg

✓ Sub-second webhook dispatch

Supported Chains

5 Active

ETH · TRON · POLY · ARB · SOL

Reorg Protection Depth

12 blocks EVM / 19 Tron

✓ Zero double-spend risk

Ledger Integrity

100.0% Balanced

✓ Strict debit = credit constraint

Merchant Checkout Simulator

Customer-facing checkout flow with real-time on-chain listening

Client View

Merchant: Enterprise Cloud SaaS

Order #INV-84920 · B2B Subscription

$1,250.00

1,250.00 USDT / USDC

Select Settlement Asset Peg: 1.00 USD

₮

USDT

Tether USD

USDC

Circle USD

€

EURC

Euro Coin

Select Blockchain Network ~3 sec finality

TRON TRC-20 · Low Gas

Arbitrum One L2 · $0.02 Fee

Polygon PoS EVM Fast

Ethereum ERC-20 Mainnet

Solana SPL · 400ms

One-Time Deposit Address 14:59

TXv9r19KpM6a7C8D4fE3w2q1a5b6c7d8e9

Send exact: 1,250.00 USDT TRC-20 Rail

Real-Time Ingestion & Settlement Engine

Event-driven pipeline with mempool listener, reorg guard, and automated sweep

Core Engine

Mempool Zero-Conf Detection

WebSocket listener catches pending TX hash before block inclusion

Awaiting TX

Block Inclusion & 1st Confirmation

Mined in block, gas fee deducted, temporary balance reserved

Pending

Consensus Finality & Reorg Protection

12 confirmations reached, zero chance of chain reorganization

Pending

Vault Sweep & Double-Entry Ledger Booked

Funds swept to cold treasury, merchant balance credited, webhook fired

Pending

Engine Telemetry & WebSocket Log TX: None

[08:30:00.102] [RPC_CLUSTER] Subscribed to Tron FullNode & Ethereum geth websocket endpoints.

[08:30:00.150] [LEDGER_DAEMON] Double-entry consistency check passed: zero imbalance detected across 14,892 accounts.

[08:30:01.000] [GATEWAY] Awaiting on-chain transaction for session INV-84920...

POST /merchant/webhook · Header: X-Savatron-Signature: t=1730190720,v1=e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

{
  "event": "charge.settled",
  "id": "evt_984f2910ab3c",
  "created_at": 1730190720,
  "data": {
    "invoice_id": "INV-84920",
    "merchant_id": "merch_saas_enterprise_01",
    "asset": "USDT",
    "network": "TRON_TRC20",
    "amount_expected": "1250.00",
    "amount_received": "1250.00",
    "deposit_address": "TXv9r19KpM6a7C8D4fE3w2q1a5b6c7d8e9",
    "tx_hash": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "block_number": 64982103,
    "confirmations": 12,
    "settlement_status": "SETTLED",
    "fee_breakdown": {
      "network_gas_fee": "0.00",
      "platform_fee": "6.25",
      "net_merchant_credit": "1243.75"
    }
  }
}

Journal Entry: #JE-99210 · Transaction Settlement

Cryptographic proof of zero balance deviation (ACID Compliant)

✓ Balanced: Debits ($1,250.00) = Credits ($1,250.00)

Account Code	Account Description	Classification	Debit (USD)	Credit (USD)	State Root Hash
1010-CRYPTO-TRANSIT	TRON TRC-20 Hot Ingestion Pool	Asset (Transit)	+$1,250.00	$0.00	0x8a1c...9f20
2010-MERCHANT-PAYABLE	Merchant Settlement Balance (Acct #M-9021)	Liability	$0.00	+$1,243.75	0x4b7e...3d11
4010-PLATFORM-REVENUE	Gateway Processing Fee (0.50%)	Revenue	$0.00	+$6.25	0x1c99...aa04
TOTAL JOURNAL SUM:			$1,250.00	$1,250.00	MERKLE MATCH ✓

RPC & Blockchain Ingestion

Failover clusters of archive/full nodes (Erigon, Geth, Tron java-tron) with WebSocket subscription. Automatic block reorg rollback handling with confirmation depth matrix.

WebSocket RPC EIP-1559 Fee Estimator BIP-44 HD Derivation Tron Energy Staking

Key Management & Treasury Sweeps

Private keys never touch disk or memory in plaintext. Automated L1/L2 sweeps into multi-sig cold vaults (Gnosis Safe / MPC) triggered by volume thresholds or scheduled cron windows.

AWS KMS / HashiCorp Vault Multi-sig Cold Vault Gas Tank Rebalancing Zero Exposure

Asynchronous Queue & Ledger

BullMQ and Redis stream worker queues with idempotent processing. PostgreSQL with transactional row-level locks preventing race conditions and double-credit attempts.

PostgreSQL ACID BullMQ / Redis Idempotent Keys Row-Level Security

OpenAPI v3.1 Specification · High-Throughput Checkout Creation POST /api/v1/checkout/sessions

curl -X POST https://savatron.online/api/v1/checkout/sessions \
  -H "Authorization: Bearer sk_live_enterprise_fintech_token" \
  -H "Content-Type: application/json" \
  -d '{
    "order_id": "INV-84920",
    "amount_usd": "1250.00",
    "supported_tokens": ["USDT", "USDC"],
    "supported_networks": ["TRON", "ARBITRUM", "POLYGON", "ETHEREUM"],
    "webhook_url": "https://merchant.com/api/webhooks/crypto",
    "redirect_url": "https://merchant.com/checkout/success",
    "expires_in_seconds": 900
  }'

# Sample 201 Created Response:
{
  "session_id": "cs_live_948f21900a",
  "checkout_url": "https://savatron.online/demo/payment-gateway.html",
  "deposit_addresses": {
    "TRON": "TXv9r19KpM6a7C8D4fE3w2q1a5b6c7d8e9",
    "ARBITRUM": "0x71C5A8B92e4a8F0945938D3035f8d95123984E32"
  },
  "expires_at": 1730191620
}