Quickstart: Node.js

Node 18+ has everything you need built in. No SDK, no install — just fetch.

send.mjs

const res = await fetch("https://api.calder.click/v1/emails", {
  method: "POST",
  headers: {
    Authorization: "Bearer calder_sk_test_…",
    "Idempotency-Key": crypto.randomUUID(),
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    from: "app@acme.com",
    to: "you@example.com",
    subject: "Hello from Calder",
    text: "It works.",
  }),
});

Run it with node send.mjs. A 202 means queued; watch the timeline in your dashboard, then read Webhooks to get pinged on delivery.