Writing from the build.

Plain-English notes from the team building DOLLA — how the payments rails actually work, what shipping on Base feels like in practice, and the parts most fintech blog posts skip because they make the math less impressive.

Engineering · 9 min read
How we built non-custodial recurring billing on Base — 250 charges a second across 10 wallet shards
Stripe needs to hold your card. PayPal needs to hold your account. We don't hold anything. Here's how the spend-permission model works, why we sharded the charger 10 ways, and what surprised us when 9% of cost stayed at 9% no matter how big we modeled it.
April 28, 2026

How we built non-custodial recurring billing on Base — 250 charges a second across 10 wallet shards