Build on s.id — REST API, Webhooks & OAuth

Base URL: https://api.s.id/v2

curl -X POST https://api.s.id/v2/links \
  -H "Authorization: Bearer sk_live_..." \
  -H "Content-Type: application/json" \
  -d '{"long_url": "https://example.com/long-url", "custom_slug": "mylink"}'

Example payload

{
  "event": "link.created",
  "link": {
    "id": 123,
    "short": "mylink",
    "short_url": "https://s.id/mylink",
    "long_url": "https://example.com/long-url",
    "title": "My Link",
    "created": "2026-06-22T10:00:00Z"
  },
  "timestamp": "2026-06-22T10:00:00Z"
}

Verify the signature (Node.js)

const crypto = require('crypto');

function verifySignature(secret, rawBody, sigHeader) {
  const expected = 'sha256=' +
    crypto.createHmac('sha256', secret).update(rawBody).digest('hex');
  return crypto.timingSafeEqual(
    Buffer.from(sigHeader),
    Buffer.from(expected),
  );
}

The secret is shown once when you create the webhook. Verify before processing the event.