Get started

Writing.

Engineering notes and product decisions, written by the people who made them.

Abstract double-entry ledger — two columns of figures aligning, a thread of light linking a debit to its credit
EngineeringMay 28, 2026

Inside the instant settlement rail

How a charge becomes spendable balance in 1.2 seconds — the pre-funding model, the risk math, and what we gave up to get there.

A clean timeline of milestones, several marked shipped with a soft glow
ProductJun 10, 2026

Changelog: payout schedules, smarter retries

Everything we shipped this quarter, including EU data residency for all plans.

Two interlocking streams of exchange-rate figures meeting at a steady midpoint
EngineeringMay 12, 2026

An FX engine that never sleeps

Streaming mid-market rates, one fixed margin, and the math of never being the worst price.

A signal arcing toward an endpoint, a faint duplicate fading harmlessly, over an immutable event log
EngineeringApr 30, 2026

Webhooks you can actually trust

Exactly-once delivery is a lie. Here is the contract we offer instead, and why it holds.

A row of dark checkout buttons with a single one lit in indigo
ProductApr 16, 2026

The long tail of local payment methods

Pix, iDEAL, BLIK — why conversion lives and dies on the second checkout button.

A vault-like scene — safeguarded columns of light beneath a ring of EU stars
CompanyMar 5, 2026

Lumina is now a licensed EMI in the EEA

What our e-money license means for your funds, and what changes (nothing, for you).

Get the changelog.

One email a month. What shipped, what changed, no marketing.