@qrrier

Qrrier

@qrrierJoined October 2026

Get paid to fly, shop the world, ship with travelers. qrrier.com

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Get paid to fly, shop the world, ship with travelers. qrrier.com

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Qrrier's blogs

Qrrierqrrier.hashnode.dev2 posts

Designing an escrow state machine for peer-to-peer deliveries with USDC on Base

A peer-to-peer delivery looks simple from the outside: someone abroad wants a thing, someone with a plane ticket brings it, money changes hands. Once you try to model it, it becomes a small distribute

20h ago · 8 min readqrrier.hashnode.dev

Would You Hand a Stranger $1,299 for a MacBook? Designing Trust Into Traveler Delivery

Picture both sides of one order. A developer in Curitiba wants a MacBook Air 13" (M5, 16 GB / 512 GB). In Brazil it costs R$15,999. A traveler flying Miami to São Paulo next week could buy it in the U

1d ago · 6 min readqrrier.hashnode.dev

Qrrier

About

Available for

Qrrier's blogs

Designing an escrow state machine for peer-to-peer deliveries with USDC on Base

Would You Hand a Stranger $1,299 for a MacBook? Designing Trust Into Traveler Delivery

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Qrrier

About

Available for

Qrrier's blogs

Designing an escrow state machine for peer-to-peer deliveries with USDC on Base

Would You Hand a Stranger $1,299 for a MacBook? Designing Trust Into Traveler Delivery