Open-source webhook infrastructure. Reliable delivery, fair pricing.
EmitHQ handles both inbound (receiving webhooks from Stripe, GitHub, Shopify) and outbound (sending webhooks to your customers' endpoints) with guaranteed delivery, automatic retries, and a dashboard to see exactly what's happening.
- Fair pricing — $49/mo, not $490. We fill the gap between free tiers and enterprise pricing.
- Both directions — Receive AND send webhooks in one platform.
- Open source — AGPL-3.0 server. Self-host or use our managed cloud.
- Standard Webhooks — Compatible with the industry-standard signing spec.
- Reliable — At-least-once delivery, configurable retries, dead-letter queue, circuit breakers.
npm install @emithq/sdkimport { EmitHQ } from '@emithq/sdk';
const emit = new EmitHQ('your-api-key');
// Send a webhook
await emit.message.send('app_customer123', {
eventType: 'invoice.paid',
payload: { invoiceId: 'inv_001', amount: 9900 },
});┌─────────────────────────────────┐
│ Cloudflare Workers (Edge) │ ← Inbound: verify signature, return 200 in <50ms
│ Inbound reception + rate │
│ limiting │
└────────────┬────────────────────┘
│ QStash (durable relay)
┌────────────▼────────────────────┐
│ Railway (Origin) │
│ │
│ API Server (Hono) │ ← REST API + webhook delivery
│ BullMQ Workers │ ← Retry with exponential backoff + jitter
│ PostgreSQL (Neon, RLS) │ ← Persist before enqueue — never lose a message
│ Redis (Upstash) │ ← Job queue + caching
└─────────────────────────────────┘
- Persist before enqueue — messages saved to PostgreSQL before Redis queue. Queue failure = recoverable. Data loss = never.
- Standard Webhooks — HMAC-SHA256 signing compatible with the industry spec.
- Row-Level Security — PostgreSQL RLS enforces tenant isolation at the database layer.
- Circuit breakers — 10 consecutive failures auto-disable an endpoint. Re-enable via API or dashboard.
- Outbound delivery — Send webhooks to your customers' endpoints with HMAC signing, retries, and DLQ
- Inbound reception — Receive webhooks from Stripe/GitHub/Shopify with provider-specific signature verification
- Dashboard — Event log, delivery attempts, endpoint health, dead-letter queue with replay
- Payload transformations — Reshape payloads with JSONPath and templates before delivery
- TypeScript SDK —
npm install @emithq/sdk— zero dependencies, typed errors, automatic retry
| Free | Starter | Growth | Scale | |
|---|---|---|---|---|
| Price | $0/mo | $49/mo | $149/mo | $349/mo |
| Events | 100K | 500K | 2M | 10M |
| Retries | Free | Free | Free | Free |
Full pricing details — retries never count toward your event limit.
docker compose upSee Self-Hosting Guide for details.
See CONTRIBUTING.md for guidelines. We welcome bug fixes, test improvements, new provider integrations, and SDK ports.
Server: AGPL-3.0 — self-host freely, copyleft for competing SaaS offerings. SDK: MIT — no restrictions on your application code.