Resend · agent Twin Score 94

Resend capability matrix

Resend is a transactional email API with React-email ergonomics and a calm dashboard. Humans inspect deliveries. Agents send mail. Documentation is the product, which is why the agent Twin Score sits next to Stripe. We do not confuse a pretty dashboard with a complete ESP for marketers — this is transactional email for builders. Twin Score on this directory is 85 for humans and 94 for agents, using the public rubric (interface, onboarding, human docs, collaboration, support, pricing fairness, accessibility, reliability versus API quality, MCP or tool surface, CLI, structured docs, machine auth, quotas, determinism, and skill packaging). Resend is sold by Resend, founded 2023, headquartered in San Francisco, USA. Pricing in public materials: Free developer tier; Pro and usage on email volume. Machine capabilities we record: API excellent, MCP none, CLI none, docs excellent, auth API keys. This page is editorial, not a star rating scraped from users.