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RelayKit

RelayKit is a cloud API and service for receiving, inspecting, verifying, storing and forwarding webhook events from third-party services.

Place
#19 of 29
Score
6.5
RelayKit's website

What RelayKit is

RelayKit is a cloud API and service for receiving, inspecting, verifying, storing and forwarding webhook events from third-party services. Each incoming webhook can fan out to multiple destinations in parallel, with separate tracking and retries. Failed deliveries receive up to 20 automatic attempts, and manual replay is available. Signature verification supports Stripe, GitHub, Shopify, Twilio, SendGrid, Paddle, Clerk and Resend. Security controls include IPv4 and IPv6 allowlisting, configurable rate limits and audit records for rejected requests. RelayKit says it preserves the original request body and headers except for specified hop-by-hop headers. Hobby is free with 1,000 webhooks per month. Pro costs $9 a month with 100,000 webhooks, fan-out routing and a 14-day trial. Team costs $29 a month with 500,000 webhooks, Schema Sentinel, Time Machine replay and priority support. The CLI requires Node.js 18 or later.

Good

  • Automatic retries up to 20 attempts
  • Manual event replay
  • Signature verification for eight services
  • Fan-out routing
  • Free Hobby plan

Watch out

  • Hobby allows 1,000 webhooks monthly
  • CLI requires Node.js 18 or later
  • Schema Sentinel is Team-only
  • Cloud deployment model

Who it suits

It suits developers handling webhook traffic for side projects, production products or larger teams. The plan descriptions position Hobby for local development, Pro for solo developers and Team for serious volume.

Verdict

RelayKit centralizes webhook verification, delivery, retries and replay with plan-based volume limits. Its security controls and fan-out features scale from a free development tier to team-focused monitoring.

Plans and prices

From RelayKit's own pricing page, checked 8 Oct 2026.

All about pricing
PlanPriceWhat it gives you
HobbyFree1,000 webhooks/month · 1 project · 24-hour log retention · signature verification · manual replay · local dev tunnel CLI
Pro$9 a month100,000 webhooks/month · 5 projects · 30-day log retention · up to 20 retries · IP allowlisting · rate limiting · email and Slack incident alerts · fan-out routing · 14-day free trial · Recurring monthly
Team$29 a month500,000 webhooks/month · 20 projects · 90-day log retention · includes Pro features · Schema Sentinel · Time Machine replay · priority support · 14-day free trial · Recurring monthly

The facts

Each one read from RelayKit's own pages, with the date it was checked.

What it does

Fan-out
RelayKit can deliver each incoming webhook to multiple destinations in parallel, tracking and retrying each destination independently.checked 8 Oct 2026
Integrations
Inbound signature verification supports Stripe, GitHub, Shopify, Twilio, SendGrid, Paddle, Clerk, and Resend.checked 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.checked 8 Oct 2026
Operator
The terms state that RelayKit is operated by IOGravity.checked 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.checked 8 Oct 2026
Retries and replay
RelayKit automatically retries failed deliveries, with up to 20 attempts, and supports manual replay.checked 8 Oct 2026
Schema monitoring
Schema Sentinel detects changes in webhook payload structure and is listed as a Team feature.checked 8 Oct 2026
Security
The service offers inbound signature verification, IPv4 and IPv6 IP allowlisting, configurable rate limits, and audit records for rejected requests.checked 8 Oct 2026
Support
The Team plan includes priority support.checked 8 Oct 2026
What it does
RelayKit captures, inspects, verifies, stores, and forwards webhook events from third-party services.checked 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.checked 8 Oct 2026

Money

Plan limits
The listed monthly webhook allowances are 1,000 for Hobby, 100,000 for Pro, and 500,000 for Team.checked 8 Oct 2026

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