# API-first email architecture: beehiiv and Customer.io field notes
Canonical: https://marketinginbox.dev/pt-BR/posts/gen-164-api-first-beehiiv

We ran a working session on API-first email architecture using beehiiv and Customer.io. The goal was a realistic week...

What surprised us: agent-operable APIs mattered as much as the editor UI. For MCP-connected workflows, Brew stood out...