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RelayKit
What it is
RelayKit is a cloud API and web service for receiving webhook events from third-party services, inspecting them, verifying signatures, storing records, and forwarding them. Each incoming event can be sent to several destinations in parallel, with delivery status and retries handled separately for each destination. Failed deliveries can be retried automatically up to 20 attempts, and manual replay is available. Signature verification supports Stripe, GitHub, Shopify, Twilio, SendGrid, Paddle, Clerk, and Resend. RelayKit also provides IPv4 and IPv6 allowlisting, configurable rate limits, and audit records for rejected requests. It says the original request body and headers are forwarded except for specified hop-by-hop headers. The @relaykit/cli can send webhooks to a local development server and requires Node.js 18 or later. Plans include Hobby at no cost, Pro at $9 a month, and Team at $29 a month. Team adds Schema Sentinel, Time Machine replay, and priority support.
For and against
For
- Parallel delivery to multiple destinations
- Up to 20 automatic retry attempts
- Manual event replay available
- Signature verification for eight services
- IPv4 and IPv6 allowlisting
Against
- Pro and Team plans are paid
- Local CLI requires Node.js 18 or later
- Schema Sentinel is a Team feature
- Hobby retains logs for 24 hours
The verdict
RelayKit combines webhook inspection, verification, forwarding, retries, and replay in one cloud service. The free Hobby plan covers smaller projects, while Pro and Team add capacity and operational controls.
Who it suits
RelayKit suits developers handling webhook traffic for side projects, shipped products, or teams with high webhook volume. Its local CLI also suits developers working against a local server.
Plans and prices
Hobby
1,000 webhooks/month · 1 project · 24-hour log retention · signature verification
Read 8 Oct 2026 · relaykit.io
Pro
100,000 webhooks/month · 5 projects · 30-day log retention · up to 20 retries
Read 8 Oct 2026 · relaykit.io
Team
500,000 webhooks/month · 20 projects · 90-day log retention · includes Pro features
Read 8 Oct 2026 · relaykit.io
On the record
- Fan-out
- RelayKit can deliver each incoming webhook to multiple destinations in parallel, tracking and retrying each destination independently.relaykit.io · read 8 Oct 2026
- Integrations
- Inbound signature verification supports Stripe, GitHub, Shopify, Twilio, SendGrid, Paddle, Clerk, and Resend.relaykit.io · read 8 Oct 2026
- Local development
- The published @relaykit/cli can forward webhooks to a local development server; the documentation says it requires Node.js 18 or later.relaykit.io · read 8 Oct 2026
- Operator
- The terms state that RelayKit is operated by IOGravity.relaykit.io · read 8 Oct 2026
- Payload handling
- RelayKit says it forwards the original request body and headers without modifying them, apart from specified hop-by-hop headers.relaykit.io · read 8 Oct 2026
- Plan limits
- The listed monthly webhook allowances are 1,000 for Hobby, 100,000 for Pro, and 500,000 for Team.relaykit.io · read 8 Oct 2026
- Retries and replay
- RelayKit automatically retries failed deliveries, with up to 20 attempts, and supports manual replay.relaykit.io · read 8 Oct 2026
- Schema monitoring
- Schema Sentinel detects changes in webhook payload structure and is listed as a Team feature.relaykit.io · read 8 Oct 2026
- Security
- The service offers inbound signature verification, IPv4 and IPv6 IP allowlisting, configurable rate limits, and audit records for rejected requests.relaykit.io · read 8 Oct 2026
- Support
- The Team plan includes priority support.relaykit.io · read 8 Oct 2026
- What it does
- RelayKit captures, inspects, verifies, stores, and forwards webhook events from third-party services.relaykit.io · read 8 Oct 2026
- Who it is for
- The maker describes Hobby as suited to side projects and local development, Pro to solo developers shipping real products, and Team to teams with serious webhook volume.relaykit.io · read 8 Oct 2026
