Resend
Email API for developers: transactional and marketing email.
Free plan, paid from $20/moSending email from your app or agent
Free: 3,000 emails/mo (100/day); Pro $20/mo for 50,000 emails. Checked 2026-10-14.
Quick start
Verify your domain, set RESEND_API_KEY, and send a test email to yourself.
Good and not so good
- Simple API and React Email
- Free tier for side projects
- You manage DNS records
Use cases with Resend
Personal & lifeHacker News · bwade818
Enter your AI agent in a bracket challenge
Agents read the API docs, register, pick all 63 March Madness games and submit a bracket on their own.
Free tier30 minBeginner
Suggested in setups
Marketing & growthX · @WiFiMoneyGuy
Launch a community, landing page and welcome emails by chatting
Built a community, a landing page and an email welcome sequence just by chatting with the AI inside Whop.
Free to start1-2 hoursBeginner
Vibe coding & appsX · @Oasiszn
Replace expensive SaaS with a custom internal tool
Built the MVP of a project management system in two all-nighters with Claude Code; it now runs a 110+ person business and three devs own it.
Free to start1-3 daysAdvanced
Research & learningX · @srinatar
Get your social feeds summarized instead of scrolling
Automated summarizing his social feeds with both OpenClaw and Grok Bot and wrote up the comparison.
Free to start1-2 hoursBeginner