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Built to send.
You'd build the queue. The retries. The audit log. The dashboard that explains the silent failures. We already did.
Every event persisted Automatic retries Full audit trail
For developers
The same wire format the SDK, the docs, and the dashboard all agree on. Idempotent retries, signed delivery, and a full audit trail — without writing any of that yourself.
import { Mittr } from "@mittr/sdk-node";
const mittr = new Mittr({ apiKey: process.env.MITTR_API_KEY });
await mittr.events.send({
eventType: "order.created",
payload: { orderId: "ord_123", amount: 9900 },
});@mittr/sdk-node is on npm — typed client, signature verification, framework-agnostic webhook middleware. Read the full quickstart →
For AI agents
Mittr speaks MCP. An agent calls it as tools — so its side effects get the same retries and audit trail as the rest of your traffic, not a fire-and-hope HTTP call.
Connect over MCP and an agent can set up endpoints, send events, and inspect or replay deliveries — the same operations your code gets, exposed as tools it can call.
A side effect stops being a fire-and-hope HTTP call. Every send gets the same backoff, circuit breakers, and dead-letter recovery as the rest of your traffic.
Events are correlated by agent run and fully logged — so you can see exactly what an agent did, and replay any delivery when it needs a second attempt.
The problem
You've shipped webhook delivery before. It worked fine until it didn't.
Server blips eat events. No retry. No log. No trace. You find out when the customer emails.
You bolt on a retry loop. It hammers failing endpoints with no backoff, no circuit breaker. Dead events pile up until recovery becomes a weekend project.
Something breaks. You hear about it from customers, not your systems. No delivery history. No status codes. No latency data. Nothing to debug with.
The solution
Every event persisted before delivery. Every attempt logged. Every failure recoverable — by you, from the dashboard.
Your event is written to durable storage before we attempt delivery. If our infrastructure crashes mid-flight, your event survives. Transactional outbox pattern, visible in your dashboard.
Exponential backoff per endpoint. Circuit breakers stop hammering failing destinations. Dead events can be edited and resent — not just replayed blindly.
Every attempt logged with status code, latency, and response body. Alert rules notify you on Slack or PagerDuty before your customers notice anything broke.
How it works
Three API calls. One dependency. Production-grade infrastructure.
01
Tell Mittr where to deliver. Set event types, retry policy, and timeout. One API call.
02
POST your payload with an idempotency key. Mittr handles fan-out, signing, and delivery.
03
Monitor from the dashboard. Replay failures. Edit and resend dead events. Every delivery is accounted for.
Capabilities
Every feature available on every plan. Only numeric limits differ.
One event delivered to every matching endpoint. Subscribe by type with wildcards.
HMAC-SHA256 on every delivery. Zero-downtime secret rotation. Mutual TLS with client certificates. CIDR allow/block lists per endpoint. SSRF protection built in.
JavaScript transforms modify method, URL, headers, body. 10+ filter operators with AND/OR/NOT combinators. Cancel events conditionally.
Delivery charts with P50/P99 latency. Edit and resend any event. Capture endpoints for debugging. Full delivery history per endpoint.
Deliver events to S3, GCS, or any S3-compatible store. Batch writes with configurable flush intervals.
Critical events jump the line across 10 priority levels. Schedule delivery up to 30 days out. Poll-based delivery available as an alternative to push.
Trigger on failure rate, latency, or queue depth. Route alerts to Slack, PagerDuty, or email.
Invite members, assign roles, isolate environments. Google and GitHub OAuth. Audit log for every change. Data export and deletion APIs. Configurable retention.
Integrations
Receive webhooks from 135+ services with automatic signature verification. Deliver alerts and events to Slack, Teams, PagerDuty, or any URL.
Point any third-party webhook at Mittr. We verify the signature, normalize the payload, and fan out to your endpoints. No custom verification code needed.
GitHubStripeShopifyTwilioSlackDiscordHubSpotSalesforcePayPalSquareDatadogPagerDutyLinearJiraIntercomSendGrid +119 more
Pre-built integrations that transform webhook payloads into native messages. Get delivery failure alerts in Slack, incident notifications in Teams, or email summaries. Templates are customizable.
Slack. Rich messages with attachments, custom channels, and emoji icons
Discord. Embeds with color coding and custom bot usernames
Microsoft Teams. MessageCard format with theme colors and sections
PagerDuty. Incident creation with routing keys and severity levels
Email. SMTP delivery with templated subject and body
Webhook. Generic HTTP POST, forward to any URL
Pricing
Pricing scales with message volume — not endpoints, seats, or API calls. Higher tiers unlock compliance + scale features (SAML, SCIM, MFA, dedicated rate limits) when you actually need them.
What counts as a message? Every event you send to POST /api/v1/events. Fan-out to multiple endpoints is one message, not many. Retries don't count. Replays within the same billing cycle don't count.
Prices in USD. Taxes may apply based on your location.
| Free Free Start building | Starter $29 $24 /mo Billed $288/yr Get started | Popular Growth $99 $82 /mo Billed $984/yr Get started | Scale $499 $415 /mo Billed $4980/yr Get started | |
|---|---|---|---|---|
| Pricing meters | ||||
| Messages / mo | 3,000 | 50,000 | 500,000 | 5M |
| Rate (req/s) | 10/sec | 100/sec | 500/sec | 2,000/sec |
| Retention | 7 days | 30 days | 90 days | 1 year |
| Overage | Hard cap | $1.00/1k | $0.50/1k | $0.20/1k |
| Features | ||||
| OAuth SSO | ✓ | ✓ | ✓ | ✓ |
| Multi-factor auth | ✓ | ✓ | ✓ | ✓ |
| Audit log | ✗ | ✓ | ✓ | ✓ |
| Transformations | ✗ | ✓ | ✓ | ✓ |
| Session policies | ✗ | ✗ | ✓ | ✓ |
| GDPR data-subject tools | ✗ | ✗ | ✓ | ✓ |
| SAML 2.0 SSO | ✗ | ✗ | ✗ | ✓ |
| SCIM provisioning | ✗ | ✗ | ✗ | ✓ |
| Extended audit retention | ✗ | ✗ | ✗ | ✓ |
| Uptime SLA | None | 99.9% | 99.9% | 99.9% + delivery |
| Support response | Best effort | 24h business | 8h business | 4h business (M-F EAT) |
Need more?
Committed volume, dedicated infrastructure, security review, compliance attestations, custom retention windows, and a 1-hour SLA. Let's talk about what your team needs.
Sign up, register an endpoint, send your first event. Five minutes from now, your webhooks are more reliable than your current setup.
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