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Cosmic Hook — Webhook inspector & replay

Cosmic Hook — Webhook inspector & replay

Ship-ready webhook debugger: ingest, inspect payloads, replay, failure alerts.

Oct 4, 2026 Developer Tools
debugger failure alerts inspector replay webhook

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Cosmic Hook — Webhook inspector & replay

About

Cosmic Hook is a focused webhook tool I built for developers who need to see what actually hit their serverWhat it doesGive each integration a unique ingest URL (/h/{token}).Store the request (method, headers, body, query).Inspect in the dashboard—tabs for headers, body, and a clean cURL copy.Replay the stored request to a destination URL you set per endpoint (server-side, with SSRF checks).Track replay status, latency, and history (success and failure).Optional email alert when a replay fails (Resend—wired on the Worker).Free vs Pro limits live in the database (profiles.plan); Stripe checkout is a stub—the buyer hooks their own billing.StackFrontend: React + Vite + Tailwind (Cloudflare Pages)Backend: Cloudflare Worker (ingest, replay, test event, account delete, cron retention)Database + auth: Supabase (migrations included)Alerts: Resend (optional)Live demoTry it at the homepage URL. The demo runs on my Cloudflare/Supabase with usage caps so visitors can test the flow without treating it as free production hosting. After purchase, the buyer deploys their own Supabase + Worker + Pages—full limits on their install.What you’re buyingFull source (web/, worker/, Supabase migrations, README, launch checklist)No secrets in the repo—you use your own Supabase and Cloudflare accountsPre-revenue, no paying customers—I’m selling the product + deployment path, not a user baseGood fit if you wantA micro-SaaS or dev-tool wedge in the webhook/debug spaceSomething listable and demo-able in a 3-minute videoA codebase you can rebrand, add Stripe/Lemon Squeezy, and shipNot includedMy Supabase project or API keysHosted SaaS on my domain after sale (demo can be taken down)Feature parity with large webhook platformsPrice: ~$1,999 (open to reasonable offers)Happy to walk through deploy and handoff after sale.

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