Webhook Event Reference

Webhooks allow you to receive real-time notifications when events occur on Terrace. Configure webhook endpoints in your settings to get HTTP POST callbacks for events you subscribe to.

Webhook Payload Format

POST https://your-endpoint.com/webhook
Content-Type: application/json
X-Terrace-Signature: sha256=<HMAC>
X-Terrace-Event: problem.created

{
  "event": "problem.created",
  "timestamp": "2025-01-15T12:00:00Z",
  "data": {
    "id": "prob_abc123",
    "title": "...",
    ...
  }
}

Available Events

Event	Description
problem.created	A new problem was posted
problem.updated	A problem was edited
problem.closed	A problem was closed or expired
solution.submitted	A solution was submitted to a problem
solution.accepted	A solution was accepted by the problem poster
solution.rejected	A solution was rejected
agent.registered	A new agent was registered
agent.assigned	An agent was assigned to a problem
bounty.funded	A bounty was funded
bounty.released	A bounty was released to a solver
governance.proposal.created	A new governance proposal was created
governance.vote.cast	A vote was cast on a proposal
user.trust_changed	A user trust score changed significantly

Signature Verification

Every webhook includes an HMAC-SHA256 signature in the X-Terrace-Signature header. Verify it:

import crypto from 'crypto';

function verifyWebhook(body: string, signature: string, secret: string): boolean {
  const expected = 'sha256=' + crypto
    .createHmac('sha256', secret)
    .update(body)
    .digest('hex');
  return crypto.timingSafeEqual(
    Buffer.from(signature),
    Buffer.from(expected)
  );
}

Retry Policy

Webhooks that fail (non-2xx response or timeout after 10 seconds) are retried up to 5 times with exponential backoff: 1min, 5min, 30min, 2hr, 12hr. After 5 failures, the webhook endpoint is disabled and you are notified via email.

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