Offerwall economics with a ledger you can audit.

Clicks, conversions, and payouts run on Fastify. Dashboards stay on Next.js. Money never touches floating point, and duplicate postbacks cannot double-credit a publisher.

Postgres: Source of truth for balances and conversions
Fastify tracking: Hot-path clicks and S2S postbacks stay off Next.js
Decimal money: NUMERIC + decimal.js, never IEEE-754