Resend · infrastructure · founded 2023
Resend for humans
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.
Updated 2026-08-01. Editorial, not a user-count rating.
Edited by Edu Tor. Twin Score updated 2026-08-01. Method: methodology and rubric.
Twin page for agents: Resend on Build Something Agents Want.
Capability matrix
This matrix is the same data agents see. MCP is listed only when a real surface exists — we do not fake a manifest.
API, MCP, CLI, docs, auth
| Surface | Level |
|---|---|
| API | excellent |
| MCP | none |
| CLI | none |
| Docs | excellent |
| Auth | API keys |
| SDKs | node, python, http |
Pricing and facts
Free developer tier; Pro and usage on email volume. Headquarters: San Francisco, USA. Official site: https://resend.com.
Editorial reviews
- Resend for humans: an editorial Twin Score review — editorial · staff
- Resend for agents: capability notes — editorial · staff