
TL;DR: Building retail onchain products traditionally requires teams to manage a fragmented stack: smart wallets, bundlers, paymasters, and complex UserOperation construction. To solve this, we engineered two foundational layers: MagicSpend, an atomic onchain funding primitive that authorizes debits from Coinbase balances with revert-safe semantics and Magic Platform, an abstraction layer that codifies ERC-4337 infrastructure. Together, they reduced product shipping timelines by 3x and have processed over $1B in volume.

TL;DR: By leveraging a "Context-First" AI workflow, we shipped Coinbase Business Invoicing in weeks instead of months. We transitioned from manual UI mocking to code-first prototyping and used scoped repository sandboxing to enable safe, cross-stack iteration.
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