Engineering September 10, 2026• 6 min read

Micro-Dollar Precision Accounting: Handling 6-Decimal CPM Micropayments at Scale

How MatrixAds stores non-floating-point financial transactions using BigInt micros ($0.000001 precision) with atomic PostgreSQL double-entry ledgers.

Elena Rostova

FinTech Database Architect

#FinTech Architecture#6-Decimal Precision#Micro-Dollar Accounting#Prisma BigInt

Floating-point arithmetic (e.g. 0.1 + 0.2 = 0.30000000000000004) is unacceptable in high-frequency financial ledgers. In programmatic ad networks, micro-dollar impression charges require 6-decimal precision.

The Micro-Dollar Standard ($1.00 = 1,000,000 Micros)

MatrixAds avoids floating-point roundoff bugs by storing all balances, impression CPMs, and clearing prices as 64-bit BigInt micro-dollars in PostgreSQL:

// $2.48 CPM represented as integer micros:
const cpmMicros = BigInt(2480000); 

// Calculating impression cost:
const impressionCostMicros = cpmMicros / BigInt(1000); // 2480 micros ($0.002480)

Atomic Ledger Transactions

Debit and credit entries are committed in a single atomic Prisma transaction block, guaranteeing total financial integrity and zero balance leakage.

Key Topics

1. Introduction
2. Architecture & Vector Search
3. Second-Price Auction Math
4. Cryptographic Click Defense

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